building technology 2 reviewer

7/28/2019 Building Technology 2 REVIEWER

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Building Technology 2 May 11, '08 2:54 AMfor everyone

BUILDING TECHNOLOGY

LAYOUT AND EXCAVATION

SPIRIT LEVEL - INSTRUMENT OR TOOL CAPABLE OF VERTICAL AND HORIZONTAL LINE CHECK.

PLUMB BOB - ITS USES FOR VERTICAL LINE CHECK.

PLASTIC HOSE FILLED W/ WATER A METHOD OF LEVELLING (HORIZONTAL) BATTERBOARDS WITHOUT TRANSIT.

3-4-5 MULTIPLES W/ THE USE OF STEEL TAPE MEASURE A MANUAL METHOD OF SQUARING THE CORNERS OF BUILDING LINES IN BUILDING LAYOUT.

SHEET PILLING A BARRIER FORMED TO PREVENT THE MOVEMENT OF SOIL TO STABILIZE FOUNDATION.

LAYOUT AND EXCAVATIONS

LAYOUT IS SOMETIMES CALLED STAKING OUT WHICH MEANS THE PROCESS OF RELOCATING THE POINT OF BOUNDARIES AND PROPERTY LINEOF THE SITE WHERE THE BUILDING IS TO BE CONSTRUCTED.

IT INCLUDES CLEARING, STAKING, BATTER BOARDS AND ESTABLISHES THE EXACT LOCATION OF THE BUILDING FOUNDATION AND WALL LINE ONTHE GROUND.

STAKE ARE WOODEN STICKS USED AS POSTS SHARPENED AT ONE END DRIVEN INTO THE GROUND TO SERVE AS BOUNDARIES OR SUPPORTS OFTHE BATTER BOARDS.

BATTER BOARD WOOD STICK OR BOARD NAILED HORIZONTALLY AT THE STAKE WHICH SERVE AS THE HORIZONTAL PLANE WHERE THE REFERENCEPOINT OF THE BUILDING MEASUREMENTS ARE ESTABLISHED.

STRING IS EITHER PLASTIC CHORD OR GALVANIZED WIRE ACROSS THE BATTER BOARDS USED TO INDICATE THE OUTLINE OF THE BUILDING WALL AND FOUNDATION.

LAYOUT METHODS AND PROCEDURES

1. BEFORE THE CONSTRUCTION BEGINS, SEE TO IT THAT A BUILDING PERMIT IS FIRST SECURED FROM THE LOCAL AUTHORITIES CONCERNED.

2. RELOCATE THE BOUDARIES OF THE CONSTRUCTION SITE. IT IS SUGGESTED THAT THE RELOCATION OF THE PROPERTY LINE SHALL BE DONE BYGEODETIC ENGINEER SPECIALLY FOR THOSE LOTS WITHOUT EXISTING REFERENCE POINTS OR ADJOINING STRUCTURES.

3. CLEAR THE SITE OF ANY EXISTING STRUCTURE, TREES, AND OTHER ELEMENTS THAT WILL OBSTRUCT THE CONSTRUCTION WORK.

4. CONSTRUCT AND ALLOCATE A SPACE FOR LABORERS QUARTERS, CONSTRUCTION OFFICE, BODEGA FOR THE MATERIALS AND WORKING TOOLS AND TEMPORARY WASTE DISPOSAL.

5. APPLY FOR A TEMPORARY CONNECTIONS OF ELECTRIC AND WATER SUPPLY. ELECTRIC CURRENT IS IMPORTANT FOR THE POWER NEEDS OFTHE TOOLS AND EQUIPMENT AND IS NECESSARY ON OVERTIME SCHEDULES ESPECIALLY IN THE TIME OF CONCRETING. WATER IS ALSO APRIME NEED IN CONSTRUCTION.

6. CONSTRUCT A TEMPORARY FENCE AROUND THE CONSTRUCTION.

7. VERIFY THE MEASUREMENT IN THE PLAN IF THE DISTANCES INDICATED ARE FORM:
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CENTER TO CENTER

OUTER TO CENTER

OUTER TO OUTER

INSIDE TO INSIDE

8. FIX THE BATTER BOARD TO ITS HORIZONTAL POSITION WITH THE AID OF LEVEL INSTRUMENT PREFERABLY PLASTIC HOSE WITH WATER.

9. AFTER ESTABLISHING THE REFERENCE POINT AND LINE OF THE FOOTING, TRANSFER THE INTERSECTING POINTS OF THE STRING ON THEGROUND BY THE AID OF PLUMB BOB AND INDICATE THE SIZE AND WIDTH TO BE EXCAVATED.

EXCAVATION

EXCAVATION WORK IN BUILDING CONSTRUCTION IS CATEGORIZED INTO TWO TYPES: THE MINOR AND MAJOR EXCAVATION DEPENDING UPONTHE SIZE AND NATURE OF THE FOUNDATION TO BE CONSTRUCTED. EXCAVATION FOR A SMALL CONSTRUCTION WITH INDEPENDENT WALL, OR COMBINEDFOOTING IS CLASSIFIED UNDER THE MINOR EXCAVATION, WHILE THE REST WHICH REQUIRES SIZEABLES OR TOTAL EXTRACTION OF THE EARTH FALLUNDER THE CATEGORY OF MAJOR CONSTRUCTION.

MINOR EXCAVATION

EXCAVATION UNDER THIS CATEGORY ARE THOSE CONSTRUCTION HAVING INDEPENDENT FOOTING AND HOLLOW BLOCK WALL FOOTING WHERETHE DIGGING OF THE SOIL FOR THE FOOTING EXTEND TO A DEPTH FROM 1.00 TO 1.50 METER AND ABOUT HALF A METER DEPTH FOR THE WALL FOOTING.

MAJOR EXCAVATION

BUILDING CONSTRUCTION THAT REQUIRES WIDE EXCAVATION OR TOTAL EXTRACTION OF THE SOIL ARE CLASSIFIED INTO TWO CATEGORIESDEPENDING UPON THE CONDITION OR LOCATION OF THE SITE. WHEN THE AREA OF THE CONSTRUCTION SITE IS BIG THAT THERE IS ENOUGH SPACE TO

ACCOMMODATE WORKING ACTIVITIES, STORING OF MATERIALS AND DUMPING GROUND FOR THE EXCAVATED SOIL.

BUILDING CONSTRUCTION ON A BUSY COMMERCIAL CENTER WITH ADJACENT EXISTING STRUCTURE IS CONSIDERED TO THE MOSTCOMPLICATED AMONG THE VARIOUS CONSTRUCTION WORKS SINCE THIS REQUIRES CAREFUL STUDY AND ANALYSIS OF THE RIGHT APPROACH.

PROBLEMS MIGHT BE ENCOUNTER:

1. THE MANNER OF THE EXCAVATION TO BE EMPLOYED WHICH WILL NOT AFFECT OR DAMAGED THE ADJOINING STRUCTURE.

2. THE KIND OF EQUIPMENT TO BE USED IN THE DIGGING AND EXTRACTING THE GROUND MAY NOT BE A PROBLEM BUT THE PLACE WHERE TO STATIONTHE EQUIPMENT DURING THE OPERATION.

3. HOW AND WHERE TO DISPOSE THE EXTRACTED SOIL INVOLVES THE EFFECTIVE MANNER OF MANEUVERING THE PAYLOAD AND DRUMPTRUCKS INHAULING WITHOUT OBSTRUCTING THE PEDESTRIAN AND VEHICULAR TRAFFIC FLOW.

4. WHERE TO DISPOSE THE UNDERGROUND WATER TO BE DRAINED BY THE WATER PUMP DURING THE PROCESS OF CONSTRUCTION WHICH MIGHTCAUSE MUDDY ROAD AND CREATE INCONVENIENCE TO TRAFFIC.

5. THE KIND OF SHEETING AND BRACING TO BE USED IN SHORING OR UNDERSPINNING TO PROTECT THE ADJOINING STRUCTURE MUST BECONSIDERED.


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FOUNDATION AND FOOTING

THE FUNCTION OF A FOUNDATION IS TO TRANSFER THE STRUCTURAL LOADS FROM A BUILDING SAFELY INTO THE GROUND.

ALL FOUNDATIONS SETTLE TO SOME EXTENT AS THE SOIL AROUND BENEATH THEM ADJUST ITSELF TO THESE LOADS.

UNIFORM SETTLEMENT IS USUALLY OF LITTLE CONSEQUENCES IN A BUILDING, BUT A DIFFERENTIAL SETTLEMENT CAN CAUSE SEVERESTRUCTURAL DAMAGE.

3 MAJOR PARTS OF A BUILDING:

SUPERSTRUCTURE WHICH IS THE ABOVE GROUND PORTION OF THE BUILDING.

SUBSTRUCTURE WHICH IS THE HABITABLE BELOW-GROUND PORTION.

FOUNDATION WHICH ARE THE COMPONENTS OF THE BUILDING THAT TRANSFER ITS LOAD INTO THE SOIL.

3 TYPES OF SUBSTRUCTURES:

SLAB ON FILL

CRAWLSPACE

BASEMENT

2 BASIC TYPES OF FOUNDATIONS:

SHALLOW FOUNDATIONS ARE THOSE THAT TRANSFER THE LOAD TO THE EARTH AT THE BASE OF THE COLUMN OR WALL OF THE SUBSTRUCTURE.

DEEP FOUNDATIONS TRANSFER THE LOAD AT A POINT FAR BELOW THE SUBSTRUCTURE.

FOUNDATION IS THAT PORTION OF THE STRUCTURAL ELEMENTS THAT CARRY OR SUPPORT THE SUPERSTRUCTURE OF THE BUILDING.

FOOTING IS THAT PORTION OF THE FOUNDATION OF THE STRUCTURE WHICH DIRECTLY TRANSMIT THE COLUMN LOAD TO THE UNDERLYING SOIL ORROCK, FOOTING IS THE LOWER PORTION OF THE FOUNDATION STRUCTURE.

FOUNDATION BED - REFERS TO THE SOIL OR ROCK DIRECTLY BENEATH THE FOOTING.

PILE FOUNDATION WHEN A FOUNDATION BED IS TOO WEAK TO SUPPORT A RAFT FOOTING, THERE IS AN URGENT NEED TO PROVIDE A SUITABLEMATERIALS WHERE TO TRANSFER THE EXCESS LOAD TO A GREATER DEPTH WHEREIN PILES IS THE ANSWER.

PILE IS A STRUCTURAL MEMBER OF SMALL CROSS-SECTIONAL AREA WITH REASONABLE LENGTH DRIVEN DOWN THE GROUND BY MEANS OFHAMMERS OR VIBRATORY GENERATOR.

PILE IS DISTINGUISHED FROM A CAISSON BY BEING DRIVEN INTO PLACE RATHER THAN DRILED & POURED.

PILES ARE GENERALLY DRIVEN CLOSELY TOGETHER IN CLUSTERS CONTAINING FROM TWO TO TWENTY-FIVE PILES. EACH CLUSTER ISLATER JOINED AT THE TOP BY A REINFORCED CONCRETE PILE CAP.

PILE CAP DISTRIBUTES THE LOAD OF THE COLUMN OR WALL EQUALLY AMONG THE PILES.

CAISSONS IS SIMILAR TO A COLUMN FOOTING IN THAT IT SPREADS THE LOAD FROM A COLUMN OVER A LARGE ENOUGH AREA OF SOIL.


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FOUNDATION WALL THAT PART OF THE BUILDING FOUNDATION WHICH FORMS THE PERMANENT RETAINING WALL OF THE STRUCTURE BELOWGRADE.

GRADE BEAM THAT PART OF A FOUNDATION SYSTEM W/C SUPPORTS THE EXTERIOR WALL OF THE SUPERSTRUCTURE AND BEARS DIRECTLY ONTHE COLUMN FOOTING.

RETAINING WALL A WALL OR LATERALLY BRACED, THAT BEARS AGAINST AN EARTH OR OTHER FILL SURFACE AND RESISTS LATERAL AND OTHERFORCES.

CANTILEVER WALL A REINFORCED CONCRETE WALL WHICH RESIST OVERTURNING BY THE USE OF CANTILEVER FOOTING.

GRAVITY WALL A MASSIVE CONCRETE WALL THAT RESIST OVERTURNING BY VIRTUE OF ITS OWN WEIGHT.

BEARING WALL A WALL CAPABLE OF SUPPORTING AN IMPOSED LOAD.

FOOTING ARE CLASSIFIED INTO TWO TYPES:

WALL FOOTING OR STRIP FOOTING IS A STRIP OF REINFORCED CONCRETE WIDER THAN THE WALL WHICH DISTRIBUTES THE LOAD TO THE SOIL.

A STEEL PERCENTAGE EQUALS TO 0.2 TO 0.3% OF THE CROSS SECTIONAL AREA OF CONCRETE IS SAID TO BE ADEQUATE EXCEPT ON UNUSUALCASES.

COLUMN FOOTING IS CLASSIFIED INTO THE FOLLOWING TYPES:

1. ISOLATED OR INDEPENDENT FOOTING IS A KIND OF FOOTING REPRESENTS THE SIMPLEST AND MOST ECONOMICAL TYPE, IN THE FORM OF:

SQUARE BLOCK FOOTING

SQUARE SLOPE FOOTING

SQUARE STEPPED FOOTING

2. COMBINED FOOTING IS USED WHEN TWO OR MORE COLUMNS ARE SPACED CLOSELY TO EACH OTHER THAT THEIR FOOTING WILL ALMOST ORCOMPLETELY MERGE. ITS EITHER :

RECTANGULAR

TRAPEZOIDAL

3. CONTINUOUS FOOTING IS SOMETIMES CLASSIFIED AS WALL FOOTING WHICH SUPPORT SEVERAL COLUMNS IN A ROW. ITS EITHER:

INVERTED SLAB FOOTING

INVERTED TEE FOOTING

4. RAFT OR MAT FOOTING ITS OCCUPIES THE ENTIRE AREA BENEATH THE STRUCTURE AND CARRY THE WALL AND THE COLUMN LOADS.

UNIFORM SLAB

THICKENED SLAB

BEAM & GIRDER

CONCRETE


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CONCRETE IS AN ARTIFICIAL STONE MADE OUT FROM THE MIXTURE OF CEMENT, SAND, GRAVEL AND WATER. THIS IS KNOWN AS SOLID MASSOR PLAIN CONCRETE. CONCRETE IN WHICH REINFORCEMENT IS EMBEDDED IN SUCH A MANNER THAT THE TWO MATERIALS ACT TOGETHER IN RESISTINGFORCES IS CALLED REINFORCED CONCRETE.

SLUMP TEST A READY MEANS OF DETERMINING THE CONSISTENCY OF FRESHLY MIXED CONCRETE.

DESIGNING OF CONCRETE MIXTURE IS BASED ON THE WATER-CEMENT RATIO.

0.68 lb. OF WATER / lb. OF CEMENT WILL PRODUCE CONCRETE CAPABLE OF DEVELOPING 2,500 PSI IN 28 DAYS.

LESS WATER PRODUCE STRONGER CONCRETE.

MORE WATER PRODUCE LESSER STRENGTH.

ADMIXTURE ACCELERATES OR RETARDS CONCRETE SETTING.

SIZES OF MEASURING BOX FOR :

40 kg. CEMENT 300mm X 300mm X 300mm

50 kg. CEMENT - 320mm X 320mm X 330mm

CONCRETE MIXTURE:

CLASS MIXTURE 40kg. 50kg. SAND GRAVEL

AA 1:11/2: 3 12 9.5 0.5 cu.m. 1.0 cu.m.

A 1:2:4 9 7 0.5 1.0

B 1:21/2:5 7.5 6 0.5 1.0

C 1:3:6 6 5 0.5 1.0

MORTAR MIXTURE:

CLASS MIXTURE 40kg. 50kg. SAND

A 1:2 18 14.5 1.0 cu.m.

B 1:3 12 9.5 1.0

C 1:4 9 7 1.0

D 1:5 7.5 6 1.0

POST AND COLUMN

POST REFERS TO A PIECE OF TIMBER OF EITHER CYLINDRICAL, SQUARE OR OTHER GEOMETRICAL CROSS SECTION PLACED VERTICALLY TO SUPPORT ABUILDING.

COLUMN REFERS TO VERTICAL STRUCTURE USE TO SUPPORT A BUILDING MADE OF STONE, CONCRETE, STEEL OR COMBINATION OF THE ABOVEMATERIALS.

STOREY IS THE SPACE IN A BUILDING BETWEEN FLOOR LEVELS OR BETWEEN A FLOOR AND A ROOF ABOVE.


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REINFORCED CONCRETE COLUMN ARE CLASSIFIED AS:

SHORT COLUMN WHEN THE UNSUPPORTED HEIGHT IS NOT GREATER THAN TEN TIMES THE SHORTEST LATERAL DIMENSION OF THE CROSSSECTION.

LONG COLUMN WHEN THE UNSUPPORTED HEIGHT IS MORE THAN TEN TIMES THE SHORTEST LATERAL DIMENSION OF THE CROSS SECTION.

TYPES OF COLUMNS ARE :

TIED COLUMN HAS REINFORCEMENT CONSISTING OF VERTICAL OR LONGITUDINAL BARS HELD IN POSITION BY LATERAL REINFORCEMENT CALLEDLATERAL TIES.

SPIRAL COLUMN IS THE TERM GIVEN WHERE A CIRCULAR CONCRETE CORE IN ENCLOSED BY SPIRALS WITH VERTICAL OR LONGITUDINALBARS. THE VERTICAL REINFORCEMENT IS PROVIDED WITH EVENLY SPACED CONTINUOUS SPIRAL HELD FIRMLY IN POSITION BY AT LEAST THREEVERTICAL BAR SPACERS.

COMPOSITE COLUMN WHERE STRUCTURAL STEEL COLUMN IS EMBEDDED INTO THE CONCRETE CORE OF A SPIRAL COLUMN.

COMBINED COLUMN WITH STRUCTURAL STEEL ENCASED IN CONCRETE OF AT LEAST 7 cm. THK. REINFORCED WITH WIRE MESS SURROUNDING THECOLUMN AT A DISTANCE OF 3 cm. INSIDE THE OUTER SURFACE OF THE CONCRETE COVERING.

LALLY COLUMN IS A FABRICATED STEEL PIPE PROVIDED WITH A FLAT STEEL BARS OR PLATE WHICH HOLD A GIRDER, GIRTS OR BEAM. THE STEELPIPE IS SOMETIMES FILLED WITH GROUT OR CONCRETE FOR CORROSION.

METAL REINFORCEMENT

THE DIFFERENT KINDS OF STRESSES THAT MAY ACT ON THE STRUCTURE ARE:

1. COMPRESSION STRESS

2. TENSION STRESS

3. SHEAR STRESS

4. TORSION STRESS

REINFORCEMENT NEED TO PROVIDE ON BEAM TO RESPONSE TO POSITIVE AND NEGATIVE BENDING WHICH MAY CAUSE FAILURE OR COLLAPSE OFTHE STRUCTURE.

REINFORCED CONCRETE IS A COMBINATION OF CONCRETE AND STEEL.

CONCRETE IS STRONG IN SUPPORTING COMPRESSION LOAD BUT WEAK IN RESISTING TENSION FORCES.

STEEL POSSESSES THE STRENGTH TO RESIST BOTH COMPRESSION AND TENSION.

BALANCE BEAM WHEN THE AREA OF THE CONCRETE AND STEEL ARE JUST ENOUGH TO CARRY THE COMPRESSION AND TENSION FORCESSIMULTANEOUSLY.

INFLECTION POINTS REFER TO THE PORTION OF A BEAM WHERE BENDING MOMENT CHANGES FROM POSITIVE TO NEGATIVE.

NO BENT BARS WHEN BARS ARE NOT BENT, AN ADDITIONAL STRAIGHT REINFORCING BARS ARE PLACED ON THE TOP OF THE BEAM ACROSS THESUPPORTS EXTENDED TO THE REQUIRED LENGTH.

BENT REINFORCING BARS ARE BENT UP ON OR NEAR THE INFLECTION POINT AND ARE EXTENDED AT THE TOP OF THE BEAM ACROSS THESUPPORT TOWARDS THE ADJACENT SPAN.


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4cm . ALLOWANCE PROTECTIVE COVERING OF STEEL BARS FROM THE OUTSIDE OF THE MAIN REINFORCEMENT.

ADVANTAGE OF THE BEND BARS, ITS RESIST THE DIAGONAL TENSION.

BUILDING CODE REQUIRED THAT A BALANCE BEAM SHALL PROVIDE, THAT THE CROSS SECTIONAL AREA OF STEEL REINFORCEMENT SHALL BE EQUALTO .005 TIMES THE CROSS SECTIONAL PRODUCT OF THE WIDTH AND THE DEPTH OF THE BEAM.

USED LATERAL TIES

10mm dia. IF LONGITUDINAL BARS 32mm SMALLER

12mm dia. IF LONGITUDINAL BARS 36mm BIGGER

THREE FACTORS FOR SPACING OF THE LATERAL TIES:

SHOULD NOT BE MORE THAN 16 TIMES THE DIA. OF THE LONGITUDINAL OR MAIN REINFORCING BARS.

SHOULD NOT BE MORE THAN 48 TIMES THE DIA. OF THE LATERAL TIES.

NOT MORE THAN THE SHORTEST DIMENSION OF THE COLUMN.

WOOD CONSTRUCTION

SCAB A SHORT FLAT PIECE OF LUMBER WHICH IS BOLTED, NAILED OR SCREWED TO TWO BUTTING PIECES IN ORDER TO SPLICE THEM TOGETHER.

FISH PLATE A WOOD OR METAL PIECE USED TO FASTEN TOGETHER THE ENDS OF TWO MEMBERS WITH NAILS OR BOLTS.

SPLICE PLATE A METAL PLATE USED FOR FASTENING TWO OR MORE MEMBER TOGETHER.

COGGED JOINT A CARPENTRY JOINT BY TWO UNEVEN TIMBERS, EACH OF WHICH IS NOTCHED AT THE PLACE WHERE THEY MEET.

NOTCHING JOINING OF TIMBERS, USUALLY MEETING OR CROSSING AT RIGHT ANGLES, BY CUTTING A DAP IN ONE OR BOTH PIECES.

CROSSLAP JOINT A JOINT CONNECTING TWO WOOD MEMBERS WHICH CROSS EACH OTHER, HALF THE THICKNESS OF EACH IS CUT SO THAT THETHICKNESS WILL THE SAME AS THAT OF EACH MEMBER.

SQUARE SPLICE A TYPE OF HALF LAPPED USED TO RESIST TENSION.

BRIDLE JOINT A JOINT IN WHICH TWO TONGUES PROJECT FROM THE SIDES OF THE TENONED MEMBER, THESE TONGUES FIT INTOCORRESPONDING SLOTS IN THE MORTISED MEMBER.

TENON THE PROJECTING END OF A PIECE OF WOOD, OR OTHER MATERIALS WHICH IS REDUCED IN CROSS SECTION, SO THAT IT MAY BE INSERTEDIN A CORRESPONDING CAVITY IN ANOTHER PIECE IN ORDER TO FORM A SECURE JOINT.

YACAL LUMBER PREFFERED WHEN IN CONTACT WITH CONCRETE.

BOARD FOOT THE VOLUME OF A PIECE OF WOOD ONE INCH. THICK, ONE FOOT WIDE AND ONE FOOT LONG.

BOLIDEN SALT TREATMENT IN WOLMANIZED LUMBER.

DAP A NOTCH IN A TIMBER FOR RECEIVING ANOTHER TIMBER.

DADO A RECTANGULAR GROOVE CUT ACROSS THE FULL WIDTH OF A PIECE OF WOOD TO RECEIVE THE END OF ANOTHER PIECE.

SOLIGNUM TRADE NAME FOR ANTI-TERMITE SURFACE APPLICATION ON WOOD.

FLOOR STRUCTURE

WOOD FLOOR SYSTEM

FLOOR FRAMING IS THAT PLATFORM STRUCTURE OF THE BUILDING SUSPENDED BY POSTS, COLUMNS, WALLS AND BEAMS.


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THE DESIGN OF A PLATFORM FLOOR SYSTEM DEPENDS UPON THE FOLLOWING CONSIDERATIONS:

1. LIVE LOAD REFERS TO THOSE MOVABLE LOADS IMPOSED ON THE FLOOR.

2. DEAD LOAD REFERS TO THE STATIC LOAD SUCH AS THE WEIGHT OF THE CONSTRUCTION MATERIALS WHICH GENERALLY CARRY THELIVE LOAD.

3. TYPES OF MATERIALS TO BE USED THE CHOICE FROM THE VARIOUS CONSTRUCTION MATERIALS SUCH AS LUMBER, CONCRETE, ANDSTEEL.

4. THE SIZING AND SPACING OF THE STRUCTURAL MEMBERS DEPENDS UPON ITS STRENGTH AND CAPABILITY TO CARRY THE LOAD AT

A CERTAIN SPACING.

5. SPAN OF THE SUPPORTS PERTAINS TO THE DISTANCES BETWEEN THE POSTS, COLUMNS OR SUPPORTING WALLS.

THE PLATFORM - FLOOR FRAMING STRUCTURE IS CLASSIFIED INTO THE FOLLOWING TYPES:

A. THE PLANK AND BEAM FLOOR TYPE

B. THE PANELIZED-FLOOR SYSTEM

C. THE CONVENTIONAL FLOOR FRAMING SYSTEM

THE DIFFERENT PARTS OF A PLATFORM FLOOR SYSTEM ARE:

GIRDER IS A PRINCIPAL BEAM EXTENDING FROM WALL TO WALL OF A BUILDING SUPPORTING THE FLOOR JOISTS OF FLOOR BEAMS.

SILL THAT PART OF THE SIDE OF A HOUSE THAT RESTS HORIZONTALLY UPON THE FOUNDATION.

FLOOR JOISTS ARE THOSE PARTS OF THE FLOOR SYSTEM PLACED ON THE GIRDERS WHERE THE FLOOR BOARDS ARE FASTENED.

HEADER AND TRIMMER HEADER IS A SHORT TRANSVERSE JOISTS THAT SUPPORT THE END OF THE CUT-OFF JOIST AT A STAIR WELLHOLE. TRIMMER IS A SUPPORTING JOIST WHICH CARRIES AN END PORTION OF A HEADER.

FLOORING THE TONGUE AND GROOVE WHICH ARE POPULARLY KNOWN AS T & G IS GENERALLY SPECIFIED FOR WOOD FLOORING .

TAIL BEAM OR TAIL PIECE A SHORT BEAM, JOIST OR RAFTER WHICH IS SUPPORTED BY A HEADER JOIST AT ONE END AND A WALL AT THE OTHER.

LEDGER STRIP A STRIP OF LUMBER WHICH IS NAILED TO THE SIDE OF THE BEAM, FORMING A SEAT FOR THE JOISTS.

DRAFTSTOP PLATE IS A PIECE OF LUMBER USES TO DRESS UP THE EDGE OF THE JOISTS.

SOLE PLATE A HORIZONTAL TIMBER WHICH SERVES AS A BASE FOR THE STUDS IN A STUD PARTITION.

SILL PLATE A HORIZONTAL TIMBER, AT THE BOTTOM OF THE FRAME OF AWOOD STRUCTURE WHICH REST ON THE FOUNDATION.

TOP PLATE A HORIZONTAL TIMBER AT THE UPPER PORTION OF THE STUDS IN ASTUD PARTITION.

CRIPPLE STUD IN ABUILDING FRAME, A STRUCTURAL ELEMENT THAT IS SHORTER THAN USUAL, AS A STUD ABOVE AND BELOW OPENING.

BLOCK OR SOLID BRIDGING SHORT MEMBERS WHICH ARE FIXED VERTICALLY BETWEEN FLOOR JOISTS TO STIFFEN THE JOISTS.

CROSS BRIDGING DIAGONAL BRACING IN PAIRS, BETWEEN ADJACENT FLOOR JOISTS TO PREVENT THE JOISTS FROM TWISTING.

HANGER OR STIRRUP A METAL SEAT, ATTACHED TO A GIRDER TO RECEIVE AND SUPPORT A JOIST.

BALLOON FRAMING CONSTRUCTION HAS STUDS CONTINOUS TO ROOF SUPPORTING SECOND FLOOR JOISTS.

WESTERN FRAMING THAT HAS SUBFLOOR EXTENDED TO THE OUTER EDGE OF THE FRAME AND PROVIDE A FLAT WORK SURFACE AT EACH FLOOR.

REINFORCED CONCRETE FLOOR SYSTEM


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BEAM - IS A STRUCTURAL MEMBER THAT SUPPORTS THE TRANSVERSE LOAD WHICH USUALLY REST ON SUPPORTS AT ITS END.

GIRDER IS THE TERM APPLIED TO A BEAM THAT SUPPORTS ONE OR MORE SMALLER BEAM.

BEAM ARE CLASSIFIED AS :

A) SIMPLE BEAM

B) CONTINUOUS BEAM

C) SEMI CONTINUOUS

SIMPLE BEAM REFERS TO THE BEAM HAVING A SINGLE SPAN SUPPORTED AT ITS END WITHOUT A RESTRAIN AT THE SUPPORT. SIMPLE BEAMSIS SOMETIMES CALLED AS SIMPLY SUPPORTED BEAM.

RESTRAINT MEANS A RIGID CONNECTION OR ANCHORAGE AT THE SUPPORT.

CONTINUOUS BEAM IS A TERM APPLIED TO A BEAM THAT REST ON MORE THAN TWO SUPPORTS.

SEMI-CONTINUOUS BEAM REFERS TO A BEAM WITH TWO SPANS WITH OR WITHOUT RESTRAINT AT THE TWO EXTREME ENDS.

WEB REINFORCEMENT

WEB REINFORCEMENT IS THE SAME AS THEIR STIRRUPS USED IN THE BEAM TO HOLD THE REINFORCEMENT IN ITS DESIGNED POSITION. THEWEB REINFORCEMENT IS NOT ONLY INTENDED TO HOLD THE REINFORCEMENT AND PROVIDE LATERAL SUPPORT BUT ALSO SERVES TO RESIST DIAGONALTENSION AND COUNTERACT THE SHEAR ACTION ON THE STRUCTURE. THE VERTICAL STIRRUPS SHOULD ENCIRCLE THE MAIN REINFORCEMENT ANDHOOK BENT WITH A DIAMETER NOT LESS THAN 5 TIMES THE DIAMETER OF THE STIRRUPS AT ITS END AND SECURED PROPERLY TO PREVENT SLIPPING OFTHE MAIN REINFORCEMENT IN THE CONCRETE.

REINFORCED CONCRETE SLAB:

REINFORCED CONCRETE FLOOR SLABS ARE CLASSIFIED INTO THE FOLLOWING TYPES:

1. ONE WAY SOLID SLAB AND BEAM.

2. TWOWAY SOLID SLAB BEAM.

3. RIBBED FLOORS.

4. FLAT SLAB OR GIRDERLESS FLOORS SOLID OR RIBBED.

EACH TYPE OF THE FLOOR SYSTEM HAS ITS OWN ADVANTAGES IN APPLICATION DEPENDING UPON THE FOLLOWING FACTORS:

1. SPACING OF THE COLUMNS.

2. THE MAGNITUDE OF THE LOADS TO BE SUPPORTED

3. LENGTH OF THE SPAN

4. THE COST OF THE CONSTRUCTION


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ONE WAY SLAB ONE WAY SLAB IS THE COMMON TYPE OF REINFORCED CONCRETE FLOOR SYSTEM WHICH THE REINFORCEMENTS RUNSONLY IN ONE DIRECTION. MADE OF SOLID SLAB SUPPORTED BY TWO PARALLEL BEAMS. IT IS COMPARATIVELY ECONOMICAL FOR A MEDIUM AND HEAVYLIVE LOADS ON SHORT SPANS RANGING FROM 2.00 TO 3.50 METERS LONG. ALTHOUGH THE REINFORCEMENTS ARE ALSO PLACED IN THE SLAB PARALLELWITH THE BEAMS PERPENDICULAR WITH THE MAIN REINFORCEMENTS CALLED TEMPERATURE REINFORCEMENTS . USUALLY NO. 3 STEEL BAR IS USEDTO COUNTERACT THE EFFECT OF SHRINKAGE AND CHANGES IN TEMPERATURE. IT ALSO DISTRIBUTES POSSIBLE CONCENTRATION OF LOADS OVER ALARGER AREA.

TWO WAY SLAB SLAB WHICH ARE SUPPORTED ON FOUR SIDES WHERE THE FLOOR PANEL IS NEARLY SQUARE IS GENERALLY ECONOMICALTO EMPLOY THE TWO DIRECTIONS OF REINFORCING BARS PLACED AT RIGHT ANGLE WITH EACH OTHER.

THE CODE SPECIFIES THAT THICKNESS OF THE SLAB SHALL NOT BE LESS THAN 4 INCHES OR 10 CM. NOR LESS THAN THE PERIMETER OF THESLAB DIVIDED BY 180. THE SPACING OF THE REINFORCEMENT SHALL NOT BE MORE THAN 3 TIMES THE SLAB THICKNESS.

RIBBED FLOOR SLAB IS AN ECONOMICAL TYPE OF FLOOR CONSTRUCTION BUT IS APPLICABLE ONLY TO MEDIUM SPAN LENGTH WITH LIGHTOR MEDIUM LOAD.

A RIBBED FLOOR SLAB CONSISTS OF SMALL ADJACENT T-BEAM W HEREIN THE OPEN SPACES BETWEEN THE RIBS ARE FILLED BY CLAY TILES,GYPSUM TILES OR STEEL FORMS. THE TILES ARE GENERALLY 30 X 90 CM. WITH DEPTH OF 10 TO 40CM. O.C. PLACED @ 5CM. O.C. MAKING THE RIBS 10 CM.WIDE.

THE CONCRETE SURFACE LAYER PLACED ON TOP OF THE TILES RANGES FROM 5 TO 6.5 CM. THICK. THE REINFORCEMENT OF A RIBBED FLOORSYSTEM CONSIST OF TWO BARS PLACED AT THE LOWER PART OF THE RIB WHERE ONE IS BENT AND THE OTHER REMAINED STRAIGHT, OR SOMETIMES,STRAIGHT BARS ARE PALCED AT THE TOP AND BOTTOM OF THE RIB. TEMPERATURE BARS ARE EITHER NO. 2 BARS OR 6 MM. OR WIRE MESH WHICH RUNS

AT RIGHT ANGLE WITH THE RIBS.

FLAT SLAB IS A RECTANGULAR SLAB DIRECTLY SUPPORTED BY COLUMNS WITHOUT BEAMS OR GIRDERS. THESLAB IS EITHER UNIFORM INTHICKNESS OR PROVIDED WITH SQUARE SYMMETRICAL AREA DIRECTLY ABOVE THE COLUMN REINFORCED WITH BARS RUNNING IN TWO DIRECTIONS.THE INCREASED AREA DIRECTLY ABOVE THE COLUMN CALLED DROP PANEL OR SIMPLY DROP. ON THE OTHER HAND, A FLARED HEAD IS EMPLOYED INTHE CONSTRUCTION OF A FLAT-SLAB FLOOR MAKING A CAPITAL OF THE COLUMN.

WHEN THE COLUMN DESIGN IS NOT PROVIDED WITH CAPITAS, A STRAIGHT FLAT UNDERNEATH IS PROVIDED IN THE SLAB THROUGHOUT THESYSTEM, WHICH IS CALLED FLAT PLATE CONSTRUCTION.

THIS FLOOR SYSTEM IS ECONOMICAL IN TERMS OF MATERIALS AND LABOR.

CONSTRUCTION JOINT A JOINT WHERE TWO SUCCESSIVE PLACEMENT OF CONCRETE MEET.

CONTRACTION JOINT OR EXPANSION JOINT A JOINT BETWEEN ADJACENT PARTS OF A STRUCTURE WHICH PERMITS MOVEMENT BETWEEN THEM.

CONTROL JOINTS EMPLOYED TO REDUCE RESTRAINT BY ACCOMODATING MOVEMENT OF MASONRY WALL.

BLOCK OUT IN CONCRETE STRUCTURES UNDER CONSTRUCTION, A SPACE WHERE CONCRETE IS NOT TO BE PLACED.

COLD JOINT A JOINT FORMED WHEN A CONCRETE SURFACE HARDEN BEFORE THE NEXT BATCH OF CONCRETE IS PLACED AGAINST.

CREEP PERMANENT DEFORMATION OF A MATERIAL UNDER A SUSTAIN LOAD.

CAMBER CONVEX CURVATURE IN BEAM OR TRUSS.

LAYING OUT OF STAIRS

THE METHOD OF LAYING OUT STAIRS ARE:


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1. DETERMINE THE CLEAR HEIGHT OF THE RISE IN METER. ORDINARILY, THE RISE PER STEP IS 17 TO 18 CM AND THE MINIMUMTREAD WIDTH IS 25 CM.

2. DIVIDE THE RISE ( HEIGHT IN METER) BY .17 OR .18 TO DETERMINE THE NUMBER OF STEPS.

3. DIVIDE THE RUN DISTANCE IN METER BY .25 OR .30m.

4. IF THE RESULT, FOUND IN STEP THREE IS LESS THAN THE NUMBER FOUND IN STEP TWO, THE RUN LENGTH HAS TO BE EXTENDED.

5. THERE SHOULD BE NO FUNCTIONAL VALUE OF A RISER. SHOULD THERE BE FROM THE RESULT OF STEP TWO, ADJUST A FUNCTIONAL VALUE INEQUAL PROPORTION TO THE NUMBER OF RISER HEIGHT, BUT IN NO CASE SHALL THE RISE PER STEP BE GREATER THAN 19 CM OR LESS THAN

17 CM OTHERWISE, THE STAIRS WILL NOT BE AN IDEAL ONE.

IT IS IMPORTANT TO MAKE A CROSS SECTIONAL SKETCH OF A STAIR BEFORE MAKING THE FINAL PLAN LAYOUT INDICATING THE NUMBER OFSTEPS TO AVOID ADJUSTMENTS OF THE RUN DURING THE ACTUAL CONSTRUCTION.

TYPE OF STRINGERS

THERE ARE SEVERAL FORMS OF STRINGER CLASSIFIED ACCORDING TO THE METHOD OF ATTACHIND THE RISERS AND THE TREADS.

1. CUT

2. CLEATED

3. BUILT-UP

4. RABBETED (HOUSE)

BALUSTER ONE OF A NUMBER OF SHORT VERTICAL MEMBERS OFTEN CIRCULAR IN SECTION, USED TO SUPPORT A STAIR HANDRAIL.

BALUSTRATE AN ENTIRE RAILING SYSTEM INCLUDING A TOP RAIL, VERTICAL MEMBERS AND BOTTOM RAIL.

BULL-NOSED STEP A STEP USUALLY LOWEST IN AFLIGHT, HAVING ONE OR BOTH ENDS ROUNDED TO A SEMI-CIRCLE AND PROJECTION BEYOND THE

FACE OF THE STAIR STRING/S.

BANISTER HANDRAIL FOR A STAIRCASE.

RISER A VERTICAL FACE OF ASTAIR.

KICKER PLATE STAIR ANCHOR TO CONCRETE.

TYPES OF ROOF

THERE ARE SEVERAL FORMS OF ROOF AND NUMEROUS VARIETY OF SHAPES THAT ONE HAS TO BE FAMILIAR WITH:

SHED OR LEAN-TO ROOF- IS CONSIDERED AS THE SIMPLEST FORM OF ROOF CONSISTING OF ONE SINGLE SLOPE.

GABLE OR PITCH ROOF- THE MOST COMMON TYPE AND ECONOMICAL FORM OF ROOF MADE OF TRIANGULAR SECTIONS CONSISTING OF TWOSLOPES MEETING AT THE CENTER OF THE RIDGE FORMING A GABLE.

SAW TOOTH ROOF- IS THE DEVELOPMENT OF THE SHED MADE INTO A SERIES TO LEAN-TO ROOF COVERING ONE BUILDING. THIS ISCOMMONLY USED ON FACTORIES WHERE EXTRA LIGHT IS REQUIRED THROUGH THE WINDOW ON A VERTICAL SIDE.


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DOUBLE GABLE ROOF- IS A MODIFICATION OF A GABLE OR A HIP AND VALLEY ROOF.

HIP ROOF- IS ALSO A COMMON FORM USED IN MODERN HOUSES HAVING STRAIGHT SIDES ALL SLOPING TOWARD THE CENTER OF THEBUILDING TERMINATING AT THE RIDGE.

HIP AND VALLEY ROOF- IS A COMBINATION OF THE HIP ROOF AND AN INTERESTING GABLE ROOF FORMING A T OR L SHAPED BUILDING. THISTYPE OF ROOF FORM HOWEVER, HAS A VARIETY OF MODIFICATION WHICH ARE NOT ILLUSTRATED.

PYRAMID ROOF- IS A MODIFICATION OF THE HIP ROOF WHEREIN THE FOUR STAIGHT SIDES ARE SLOPING TOWARDS THE CENTERTERMINATING AT A POINT.

GAMBREL ROOF- IS A MODIFICATIN OF THE GABLE ROOF WITH EACH SIDE HAVING TWO SLOPES.

BUTTERFLY ROOF- IS A TWO SHED ROOF WHERE THE SLOPE MEET AT THE CENTER OF THE BUILDING.

MANSARD ROOF- WHERE THE SIDES OF THE ROOF SLOPE STEEPLY FROM EACH SIDE OF THE BUILDING TOWARDS THE CENTER FORMING AFLAT DECK ON TOP.

FRENCH OR CONCAVE MANSARD ROOF- IS A MODIFICATION OF THE MANZARD ROOF WHERE THE SIDES ARE CONCAVE.

DOME- IS A HEMISPHERICAL FORM OF ROOF USUALLY USED ON OBNSERVATORIES.

CONICAL ROOF OR SPHIRE- IS A STEEP ROOF OF CIRCULAR SECTION THAT TAPERS UNIFORMLY FROM THE CIRCULAR BASE TO A CENTRALPOINT.

TYPES OF ROOF FRAME

THE THREE TYPES OF ROOF FRAME COMMONLY USED ARE:

1. RAFTERS TYPE

2. TRUSS TYPE

3. LAMINATED TYPE

THE VARIOUS KINDS OF RAFTERS FOR ROOF CONSTRUCTIONS ARE:

COMMON RAFTERS- ARE RAFTERS EXTENDED AT RIGHT ANGLES FROM THE PLATE OR GIRTS T THE RIDGE.

HIP RAFTERS- ARE RAFTERS LAID DIAGONALLY FROM THE CORNER OF A PLATE OR GIRTS TO THE RIDGE.

VALLEY RAFTERS- RAFTERS PLACED DIAGONALLY FROM THE PLATE OR GIRTS AT THE INTERSECTION OF GABLE EXTENSION WITH THE MAIN ROOF.

OCTAGONAL RAFTERS- ARE RAFTERS PLACED ON AN OCTAGONAL SHAPED PLATE AT THE CENTRAL APEX OR RIDGE POLE.

JACK RAFTERS- ANY RAFTER WHICH DOES NOT EXTEND FROM THE PLATE OR GIRTS TO THE RIDGE.

JACK RAFTERS ARE CLASSIFIED INTO:


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1. HIT JACKS

2. VALLEY JACKS

3. CRIPLE JACKS

JACK RAFTERS FRAMED BATWEEN HIP RAFTERS AND GITS ARE CALLED HIP JACKS. THE FRAME BETWEEN THE RIDGE AND VALLEY RAFTERS ARECALLED VALLEY JACKS , WHILE THOSE FRAMES BETWEEN THE HIP AND THE VALLEY RAFTERS ARE CALLED CRIPPLE JACKS.

TRUSS IS A BUILT-UP FRAME COMMONLY EMPLOYED ON A LONG SPAN ROOF UNSUPPORTED BY INTERMEDIATE COLUMNS OR PARTITIONS. TRUSS IS ADESIGN OF A SERIES OF TRIANGLES USED TO DISTRIBUTE LOAD, STIFFEN THE STRUCTURE AND FLEXIBILITY FOR THE INTERIOR SPACING AS WELL ASSTRENGTH AND RIGIDITY.

THE DIFFERENT TYPES OF TRUSSES ARE :

LIGHT TRUSSES:

PITCHED HOWE

SCISSORS RAISED CHORD

SAWTOOTH 1 STORY FRAME

FLAT UTILITY

BOWSTRING

HEAVY TRUSSES:

HOWE TRUSS BELGIAN

FINK PRATT

SCISSORS CAMBERED FINK

WARREN FLAT HOWE


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SAW TOOTH FLAT PRATT

PURLINS THE STRUCTURAL MEMBER PLACED ON TOP OF A RAFTER OR TOP CHORD OF A TRUSS THAT SUPPORTS THE ROOF SHEATING.

PURLINS SIZE AND SPACING:

SPAN: 2.00 SIZE: 50mm X 75mm

3.00 50mm X 100mm

3.50 50mm X 150mm

4.50 50mm X 200mm

ROOF AND ROOFING MATERIALS

THE TERM ROOF USED HERE MEANS THE TOP COVERING OF A BUILDING THAT SERVES AS A PROTECTIVE COVERING FROM THE WEATHER.

ROOFING CLASSIFICATION ACCORDING TO THE MATERIALS USED:

FIBER

WOOD

METAL

SLATE

TILES

REINFORCED CONCRETE

PLASTICS

FIBERGLASS

METAL ROOFING IS THE MOST COMMON MATERIALS IN BUILDING CONSTRUCTION, THIS ARE CLASSIFIED AS FOLLOWS:

GALVANIZED IRON

ALUMINUM

TIN

TITANIUM COPPER ZINC

COPPER

STAINLESS STEEL


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LEAD

AMONG THE METAL ROOFING ENUMERATED, GALVANIZED IRON SHEET IS THE MOST COMMONLY SPECIFIED CONSIDERING THE ADVANTAGESTHAT IT OFFER.

GALVANIZED IRON ROOFING IS EITHER PLAIN OR CORRUGATED. THE THICKNESS ARE MEASURED IN TERMS OF GAUGE FROM ga. 14 TO ga. 30.Gauge 26 IS THE MOST COMMONLY USED FOR ROOFING.

THE STANDARD COMMERCIAL SIZE WIDTH IS 0.80 m. WITH LENGTH THAT RANGES FROM 1.50 TO 3.60 m.

PLAIN G.I. SHEET COMMERCIAL STANDARD SIZE IS 0.90m. X 2.40m. ITS ALSO USED FOR ROOFING, GUTTERS,FLASHING,RIDGE,HIP AND VALLEYROLLS, DOWNSPOUT, AND STRAP FOR RIVETING.

CORR. G.I.ROOFING FASTENERS:

NAILING

RIVETING

PANTILE A ROOFING TILE WHICH HAS THE SHAPE OF S LAID ON ITS SIDE.

MISSION TILE A CLAY ROOFING TILE, APPROX. SEMI-CYLINDRICAL IN SHAPE LAID IN COURSES WITH THE UNIT HAVING THEIR CONVEX SIDE ALTERNATELY UP AND DOWN.

ROMAN TILE A CHANNEL SHAPED, TAPERED, SINGLE LAP ROOPING TILE.

GALVANIZED ZINC COATED MATERIALS.

A FRAME A 3- PIECE RIGID STRUCTURAL FRAME IN THE SHAPE OF THE UPRIGHT CAPITAL A.

CHORD A PRINCIPAL MEMBER OF A TRUSS.

BATTEN WOOD STRIPS TO SUPPORT ROOF TILES.

SPLIT RING CHORD SPLICE CONNECTORS FOR TRUSSES.

FORM, SCAFFOLDING AND STAGING

FORM IS A TEMPORARY BOARDING, SHEATING OR PANS USED TO PRODUCE THE DESIRED SHAPE AND SIZE OF CONCRETE. FORMS ARE USEDIN CONCRETE CONSTRUCTION. STRUCTURAL MEMBERS OF A BUILDING ARE BUILT-UP INTO ITS SPECIFIED DIMENSIONS BY THE USE OF FORMS THATSERVES AS MOULD FOR THE MIXED CONCRETE.

FORMS SHOULD BE WATERTIGHT, RIGID AND STRONG ENOUGH TO SUSTAIN THE WEIGHT OF CONCRETE. IT SHOULD BE SIMPLE ANDECONOMICALLY DESIGNED TO BE REMOVE EASILY AND REASSEMBLED WITHOUT DAMAGE TO THEMSELVES OR TO THE CONCRETE.

FACTORS CONSIDERED IN THE SELECTION OF FORMS ARE:

COST OF MATERIALS

THE CONSTRUCTION AND ASSEMBLING COST

THE NUMBER OF TIMES IT COULD BE USED

STRENGTH AND RESISTANCE TO PRESSURE AND THE TEAR & WEAR

WOOD BOARD AND PLYWOOD FORMS


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WOOD FORM IS THE MOST COMMON AND WIDELY USED FORMS IN MINOR OR MAJOR CONSTRUCTION.

PLYWOOD AS FORM IS GENERALLY ECONOMICAL BOTH IN LABOR AND MATERIALS.

PLYWOOD HAS PLAIN EVEN SURFACE WITH UNIFORM THICKNESS.

IT OFFERS FITTED JOINTS, ELIMINATE DRESSING, PLANING OF THE SURFACE WHICH IS NORMAL TO WOODEN BOARDS FORMS.

THE LAMINATED CROSS-GRAINED OF PLYWOOD HAS MADE THE BOARD STRONGER AND FREE FROM WARPING.

PLYWOOD IS LIGHT-WEIGHT, HANDY AND FAST TO WORK ON.

PRODUCE SMOOTH FINISHES OF CONCRETE THAT SOMETIMES NEED LITTLE OR NO PLASTERING AT ALL.

METAL FORM ARE SELDOM USED IN BUILDING CONSTRUCTION BECAUSE OF THE VARIED DESIGNS AND SHAPES OF THE STRUCTURES. ALTHOUGH METAL FORMS ARE EXTENSIVELY USED ON ROAD CONSTRUCTION. METAL FORMS ARE GENERALLY MADE OUT OF G.I. SHEET, OR BLACK IRONSHEET, SUPPORTED BY FLAT AND ANGLE BARS DESIGNED TO BE ASSEMBLED AND LOCKED BE MEANS OF CLAMP, BOLTS AND NUTS.

CONSTRUCTION OF FORMS

CONCRETE WEIGHS ABOUT 2,200 TO 2,400 kg./cu.m. FORMS SHALL BE GUARDED AGAINST BULGING AND SAGGING FAILURE THAT OCCUR DURINGTHE PROCESS OF POURING. THE THICKNESS OF THE FORM AND THE SIZES OF THE FRAME AND RIBS DEPENDS UPON THE NATURE OF THE STRUCTURETO BE SUPPORTED CLASSIFIED AS SMALL, MEDIUM AND MASSIVE STRUCTURE.

SMALL STRUCTURE CONSISTING OF SMALL FOOTINGS, COLUMNS AND BEAM FOR ONE OR TWO STOREY BUILDING WHEREIN 6mm. THK. PLYWOOOD ISSATIFACTORILY USED SUPPORTED BY 50mm X 50mm WOOD FRAME AND RIBS.

MEDIUM STRUCTURE ARE THOSE HAVING CONCRETE COLUMNS, BEAMS, AND CONCRETE FLOOR SLAB GENERALLY OF 2 TO 3 STOREY HIGH.WHEREIN 6mm OR 12mm THK. PLYWOOD IS USED AS FORM SUPPPORTED BY 50mm X 50mm OR 50mm X 75mm WOOD FRAME AND RIBS.

MASSIVE STRUCTURE ARE THOSE HAVING HEAVY LOADS USES FORMS OF VARIOUS THICKNESS THAT RANGE FROM 6mm TO 19mm THK. PLYWOODSUPPORTED BY 50mm X 50mm TO 50mm X 100mm WOOD FRAME AND RIBS.

TWO TYPES OF FRAMING:

LONGITUDINAL RIB TYPE

PERPENDICULAR RIB TYPE

TYPES OF COLUMN FORMS:

SQUARE

RECTANGULAR

CIRCULAR

BEAM FORMS CONSIST OF ONE BOTTOM FORM AND A PAIR OF SIDE FORMS.

TYPES OF WALL FORMS:

CONTINUOUS

FULL UNIT

LAYER UNIT


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GREASING OF FORMS

THE PURPOSE OF GREASING THE FORM IS TO MAKE THE WOOD WATER PROOF, THUS PREVENTING ABSORPTION OF WATER IN THE CONCRETEWHICH CAUSES SWELLING AND WARPING. ITS ALSO PREVENTS ADHERENCE OF CONCRETE TO THE PORES OF THE WOOD.

YOKE IS A HORIZONTAL FRAMEWORK AROUND THE FORMWORK FOR A COLUMN.

SCAFFOLDING WORKERS PLATFORM

BUILDING CONSTRUCTION TERMS

ENGLISH VERNACULAR ENGLISH VERNACULAR

Adobe Anchor --------------------- Liyabe Earth Fill------------------- Escombro

Aligned ----------------------------- Kaliniya Eave ------------------------ Alero,Barakilan,

Sopo

Alignment -------------------------- Asintada Electrician ----------------- Elektrista

Alternate or staggered ------------ Uno Sinotra Engineer ------------------- Inhenyero

Anchor ------------------------------ Liyabe Exterior Siding ----------- Tabike

Architect ---------------------------- Arkitekto Faucet ---------------------- Gripo

Astragal ----------------------------- Batidura Fascia Board -------------- Senepa

Balusters ---------------------------- Balustre,Barandilla Feet ------------------------ Piye

Beam -------------------------------- Biga Fill ------------------------- Tambak

Banisters ---------------------------- Barandil Filler ----------------------- Tapal, Dagdag

Barrel Bolt -------------------------- Trankilya Floor Joist ----------------- Soleras

Baseboard -------------------------- Rodapis Fillet ----------------------- Batidura

Bath tub ---------------------------- Baniera Flooring ------------------- Sahig, Suelo

Bolt --------------------------------- Pierno Floor sill ------------------ Guililan

Bottom Chord --------------------- Tirante, Estunyo Flush ---------------------- Alahado

Brace ------------------------------- Pie de Gallo Foundation or Footings- Pundasyon

Brick ------------------------------- Landrillo Foreman ------------------ Kapatas,

MaestroDe Obra

Canopy ---------------------------- Media Agua Framework --------------- Balangkas

Cabinet Hinge -------------------- Espolon Gable Roof -------------- Dos Aguas

Carpenter ------------------------- Karpintero Girder --------------------- Guililan

Carpentry ------------------------- Karpinteria Girts or Girder ----------- Sepo

Cast Iron -------------------------- Pundido Gravel --------------------- Graba


18/53

Ceiling ---------------------------- Kisame Good Grain --------------- Haspe

Ceiling Board -------------------- Groobe -------------------- Canal

Ceiling Joist ---------------------- Kostil Yahe Gutter --------------------- Alulod, canal

Cement --------------------------- Semento Hand rail ----------------- Gabay

Cement Brick -------------------- Ladrilyo Head ---------------------- Sombrero

Cement Tiles --------------------- Baldosa Hinge --------------------- Bisagra

Chain bolt ------------------------ Baral de Kadena Hip roof ------------------ Kuatro Aguas

Collar ----------------------------- Sinturon Horizontal Stud -------- Trabe-Anzo

Column --------------------------- Kolumna,Haligue Inch ----------------------- Pulgada

Concrete -------------------------- Konkreto Jamb ---------------------- Hamba

Concrete Slab -------------------- Larga Masa Joist ----------------------- Suleras

Concrete Beam ------------------ Biga Kingpost ----------------- Pendolum

Conductor ------------------------ Alulod Laborer ------------------- Piyon

Contractor ------------------------ Kontratista Landing ------------------ Mesa Pahingahan

Corr. G.I. sheets ----------------- Yiero Canalado Lavatory ----------------- Lababo

Galbanisado

Closed Stringer ------------------ Escalera Laying of CHB orAdobe Stone ------------Asinta

Crushed Stone ------------------- Eskombro Lean to roof ------------- Sibe

Diagonal Brace ------------------ Sinturon Level --------------------- Lebel

Door ------------------------------- Pinto Machine Bolt ----------- Peirno Pasante

Door Fillet ------------------------ Batidora Mason ------------------- Kantero

Door Head ------------------------ Sombrero (Pintuan) Masonry ----------------- Kanteria

Door Jamb ------------------------ Hamba Pintuan Masonry Fill ------------ Lastilyas

Drawbore Pin or Drawpin ------ Punsol Meter --------------------- Metro

Mitre or Miter -------------------- Canto Mesa Septic Tank ------------- Poso Negro

Mixture of Sand & Gravel ------ Lastilyas Shape -------------------- Korte

Mortar ----------------------------- Paupo Sheet --------------------- Plantsa

Mortar Joists ---------------------- Kostura Shower ------------------- Dutsha

Moulding -------------------------- Moldura Sidings ------------------- Tabika

Nailers ----------------------------- Pamakuan Sink ----------------------- Prigadero

Nail -------------------------------- Pako Sketch Plan -------------- Krokis

Nail Setter ------------------------ Punsol Slab (rough) -------------- Larga Masa

Newel Post ----------------------- Tukod Slope ---------------------- Bahada

Nut --------------------------------- Tuerka Solder --------------------- Hinang


19/53

Nicolite Bar ----------------------- Estanyo Solder Bar ---------------- Estaniyo

Oakum ----------------------------- Estopa Spacing ------------------- Biento

Open Stringer --------------------- Hardinera Split Knob ---------------- Poleya

Over Hand or Projector ---------- Bolada Stairs ---------------------- Hagdanan

Painter ------------------------------ Pintor Stake ----------------------- Staka

Panel -------------------------------- Bandeha Stringer (open) ----------- Hardinera

Panellee Door ---------------------- De Bandeha Stringer -------------------- Madre, Madrina

Pattern ------------------------------ Plantilya Stucco --------------------- Palitada

Pea Gravel ------------------------- Grabita Stud (vertical)------------- Pilarete

Pendulum (King Post) ------------ Pendulon Stud (horizontal) --------- Pabalagbag

Pickwork --------------------------- Piketa Temper (metal work)----- Suban, Subuhan

Piglead ------------------------------ Tingga, Estopa Thread --------------------- Roskas

Plain G.I. sheet -------------------- Yiero Liso Galbanisado Tinsmith ------------------- Latero

Plain G.I. Strap -------------------- Lingueta Tinsmithing --------------- Lateria

Plank Board ------------------------ Senepa Top Chord ---------------- Kilo, Tahilan

Plaster ------------------------------- Palitada Transom ------------------ Espeho

Plastered Course ------------------- Kusturada Tread ---------------------- Baytang, Perdano

Plug ---------------------------------- Tapon Trellise -------------------- Pergola

Plumb Bob -------------------------- Hulog Truss ----------------------- Truss, Kilo

Plumber ----------------------------- Tubero Varnished ----------------- Varnisado

Plumb Line ------------------------- Hulog Vertical Stud -------------- Pilarete

Post ---------------------------------- Poste, Haligue Wainscoating Tiles ------- Asolehos

Projection --------------------------- Bolada Washer --------------------- Pitsa, Tsapa

Purlins ------------------------------- Reostra Water Closet -------------- Inidoro

Putty --------------------------------- Masilya Window ------------------- Bintana

Quarter Round ---------------------- Mediacana Window Grille ----------- Rehas

Rabbet ------------------------------- Vaciada Window Head ------------ Sombrero

Bintana

Rafters ------------------------------- Kilo Window Jamb ------------ Hamba Bintana

Reinforcing Bar -------------------- Cabilla, Bakal Window Sill -------------- Pasamano

Ridgeroll ---------------------------- Caballete W.I. Strap ----------------- Planchuela

Riser --------------------------------- Senepa, Takip Wiring Knob ------------- Poleya

Silipan

Rivets ------------------------------- Rimatse Wood Grain -------------- Haspe

Roof -------------------------------- Atip, Bubong Wood Plank -------------- Tabla


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Sand -------------------------------- Buhangin Wrought Iron Strap ------ Plantsuela

Scaffolding ------------------------ Andamiyo, Plancha

Scratch Coat ----------------------- Rebokada

Screw ------------------------------- Turnilyo

PRECAST AND PRESTRESSED CONSTRUCTION

INTRODUCTION

THE INTRODUCTION OF PRECAST-CONCRETE CONSTRUCTION WAS BROUGHT ABOUT BY BUILDING COSTS THAT HAS CONSIDERABLYINCREASED FASTER THAT MOST INDUSTRIAL PRODUCTS THAT ARE AFFECTED BY THE LARGE AMOUNT OF ON-SITE LABOR INVOLVED IN THE TRADITIONALMETHODS OF CONSTRUCTION.

THE DEMAND FOR SKILLED WORKERS ON ON-SITE BUILDING CONSTRUCTION IS INCREASINGLY OUTRUNNING THE SUPPLY. THE ANSWER TOTHERE PROBLEMS WERE BROUGHT ABOUT BY THE INDUSTRIALIZATION OF CONSTRUCITON AND SUBSTITUTION OF SITE LABOR BY FACTORY PRODUCEDPRECAST CONCRETE STRUCTURE WHICH HAS RAPIDLY DEVELOPED AND GAINED IMPORTANCE.

THE CONCRETE IS CAST IN PERMANENT FORMS OF STEEL, CONCRETE, GLASS-FIBER-REINFORCED PLASTIC.

THE WET CONCRETE IS VIBRATED MECHANICALLY IN THE FORMS TO ACHIEVE MAXIMUM DENSITY AND HIGHEST SURFACE QUALITY.

CONCRETE STRENGTH IN PRECAST IS USUALLY 5000 PSI, WHILE 270,000 PSI FOR STRENGTH OF STEEL.

PRECAST CONCRETE ELEMENTS ARE USUALLY STEAM CURED WITH THE USE OF HIGH EARLY STRENGTH CEMENT TO ENABLE A PRECAST TOREMOVE IN FORM IN 24 HOURS.

FORMS ARE CALLED CASTING BEDS. THE CASTING BEDS AVERAGE 125 METERS TO EXTEND 250 METERS IN LENGTH.

TYPES OF PRECAST STRUCTURE

WALL PANELS THIS TYPE OF PRECAST STRUCTURE HAS NUMEROUS DESIGNS DEPENDING UPON THE ARCHITECTURAL REQUIREMENTS. THECOMMON SHAPES PRODUCED FOR ONE TO FOUR STOREY HIGH STRUCTURES ARE SECTIONS HAVING A WIDTH UP TO 2.40 m. THEY ARE USED AS CURTAINWALLS ATTACHED TO COLUMNS AND BEAMS OR SOMETIMES AS BEARING WALLS.

THE DIFFERENT TYPES OF WALL PANELS ARE :

1. FLAT TYPE

2. DOUBLE TEE TYPE

3. RIBBED TYPE

4. WINDOW OR MULLION TYPE


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TO IMPROVE THE THERMAL INSULATION OF THE PANEL, FOAM GLASS, GLASS FIBER OR EXPANDED PLASTIC IS INSERTED BETWEEN TWOLAYERS OF LIGHTWEIGHT CONCRETE ADEQUATELY BONDED INTERCONNECTING THE TWO LAYERS TO ACT AS ONE UNIT. STRESSES IN HANDLING ANDERECTION OF THE MEMBER IS MORE THAN THAT OF THE FINISHED FILLED STRUCTURE, HENCE, CONTROL OF CRACKING IS OF GREAT IMPORTANCE.

PRECAST COLUMN

PRECAST COLUMN SIZES ARE FROM .30 x .30m. to .60 x .60m. IN A MULTI-STOREY CONSTRUCTION, THE COLUMNS ARE MADE CONTINUOUS UP TO

FOUR STORIES WHEREIN CORBELS ARE USED TO PROVIDE BEARING FOR THE BEAM. TEE COLUMN IS SOMETIMES USED TO SUPPORT DIRECTLY DOUBLETEE FLOOR MEMBERS WITHOUT THE USE OF INTERMEDIATE MEMBERS.

PRECAST BEAMS

THE SHAPE OF PRECAST BEAMS DEPENDS UPON THE MANNER OF FRAMING. THE VARIOUS SHAPES ARE:

RECTANGULAR BEAM

INVERTED TEE BEAM

L SHAPED BEAM

AASHTO BRIDGE GIRDER AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS.

ROOF AND FLOOR MEMBERS

SOLID FLAT SLAB WIDE RANGES FROM 0.60M. TO 2.4M.

HOLLOW CORE SLAB WIDE RANGES FROM 0.60M. TO 2.4M.

DOUBLE TEE WIDE RANGES FROM 2.4 TO 3.0M.

SINGLE TEE WIDE RANGES FROM 2.4 TO 3.0M.

PRELIMINARY DESIGN OF A PECAST CONCRETE STRUCTURE

ESTIMATE THE DEPTH OF A PRECAST SOLID SLAB AT 1/40 OF ITS SPAN. DEPTH TYPICALLY RANGE FROM 90-200mm.

AN 200mm PRECAST HOLLOW-CORE SLAB CAN SPAN APPROXIMATELY 7.60M., 250mm SLAB APPROX. 9.80M., AND A 300mm SLAB APPROX. 12.0M. SPAN.

ESTIMATE THE DEPTH OF PRECAST CONCRETE DOUBLE TEES AT 1/28 OF THEIR SPAN. THE MOST COMMON DEPTHS OF DOUBLE TEES ARE300,350,400,450,510,610, AND815mm.

A PRECAST CONCRETE SINGLE TEE 928mm DEEP SPANS APPROXIMATELY 26.0M. AND 1142mm TEE FOR 32.0M. SPAN.

ESTIMATE THE DEPTH OF PRECAST CONCRETE BEAMS AND GIRDERS AT 1/16 OF THEIR SPAN FOR LIGHT LOADINGS AND 1/12 OF THEIR SPAN FORHEAVY LOADINGS. THESE RATIOS APPLY TO RECTANGULAR, INVERTED TEE AND L-SHAPED BEAMS. THE WIDTH OF A BEAM OR GIRDER IS USUALLY

ABOUT ITS DEPTH. THE PROJECTING LEDGERS ON INVERTED TEE AND L-SHAPED BEAMS ARE USUALLY 150mm WIDE AND 300mm DEEP.

TO ESTIMATE THE SIZE OF A PRECAST CONCRETE COLUMN. ADD UP THE TOTAL ROOF AND FLOOR AREA SUPPORTED BY THE COLUMN. A 250mm.COLUMN CAN SUPPORT UP TO ABOUT 185 sq.m. OF AREA. A 300mm. COLUMN FOR 240 sq.m. AREA. A 400mm. COLUMN FOR 370 sq.m. AREA. A 500mm.COLUMN FOR 560 sq.m. AREA. A 600MM. COLUMN FOR 740 sq.m. AREA.


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JOINING PRECAST CONCRETE ELEMENTS

BOLTING, WELDING, AND GROUTING ARE ALL COMMONLY EMPLOYED IN THESE CONNECTIONS. EXPOSED METAL CONNECTORS NOT COVEREDBY TOPPING ARE USUALLY DRY PACKED WITH STIFF GROUT AFTER BEING JOINED, TO PROTECT THEM FROM FIRE AND CORROSION.

THE SIMPLEST JOINTS IN PRECAST CONCRETE CONSTRUCTION ARE THOSE THAT RELY UPON GRAVITY BY PLACING ONE ELEMENT ON TOP OF ANOTHER, AS IS DONE WHERE SLAB ELEMENTS REST ON A BEARING WALL OR BEAM, OR WHERE A BEAM RESTS ON THE CORBEL OF A COLUMN. BEARING

PADS ARE USUALLY INSERTED BETWEEN THE CONCRETE MEMBERS AT BEARING POINTS TO AVOID THE CONCRETE-TO-CONCRETE CONTACT THAT MIGHTCREATE POINTS OF HIGH STRESS. BEARING PADS ALSO ALLOW FOR EXPANSION AND CONTRACTION IN THE MEMBERS. FOR SOLID AND HOLLOW-CORESLABS THESE PADS ARE STRIPS OF HIGH-DENSITY PLASTIC. UNDER ELEMENTS WITH HIGHER POINT LOADING SUCH AS TEES AND BEAMS, PADS OFSYNTHETIC RUBBER AREUSED.

PRESTRESSING OF CONCRETE

THERE ARE SEVERAL METHODS EMPLOYED IN APPLYING PRESTRESSED FORCE TO A CONCRETE BEAM:

PRECOMPRESSING METHOD IS A PROCESS OF USING JACKS REACTING AGAINST ABUTMENT.

SELF-CONTAINED METHOD THE PROCESS IS DONE BY TYING THE JACK BASE TOGETHER WITH WIRES OR CABLES LOCATED ON EACH SIDE OF THEBEAM. USUALLY THE WIRES AND CABLES ARE PRESSED THROUGH A HOLLOW CONDUIT EMBEDDED IN THE CONCRETE BEAM. ONE END OF THETENDON IS ANCHORED AND FORCES ARE APPLIED AT THE OTHER END. AFTER ATTAINING THE DESIRED PRESTRESS FORCE, THE TENDON IS THENWEDGED AGAINST THE CONCRETE, REMOVING THE JACK EQUIPMENT.

BOND FRICTION THE PRESTRESSING STRANDS ARE STRETCHED BETWEEN MASSIVE ABUTMENT PRIOR TO CASTING OF CONCRETE IN THE BEAMFORMS. AFTER THE CONCRETE HAS GAINED SUFFICIENT STRENGTH, THE JACKS ARE THEN RELEASED TRANSFERRING THE PRESTRESSED FORCETO THE CONCRETE BY BOND AND FRICTION ALONG THE STRANDS.

THE SELF CONTAINED AND THE BOND AND FRICTION METHODS CAN GENERALLY BE CLASSIFIED AS PRE-TENSIONING OR POST-TENSIONINGSYSTEM. THESE METHODS CAN BE APPLIED TO MASS PRODUCTION OF CASTING SEVERAL METERS LONG OF STRUCTURE AND CUTTING THE INDIVIDUAL

BEAM OR POST TO THE DESIRED LENGTH OUT FROM THE LONG CASTING.

THERMAL PRESTRESSING THE STEEL IS PREHEATED BY MEANS OF ELECTRIC POWER WHICH ARE ANCHORED AGAINST THE OPPOSITE END OF THECONCRETE BEAM. THE COOLING PROCESS PRODUCES PRESTRESS FORCE THROUGH RESTRAINED CONTRACTION.

THE CAUSES OF PRESTRESS LOSSES ARE :

1. SLIP AT ANCHORAGE

2. ELASTIC SHORTENING OF CONCRETE

3. CREEP OF CONCRETE

4. SHRINKAGE OF CONCRETE

5. RELAXATION OF STEEL STRESS

6. FRICTIONAL LOSS DUE TO INTENDED OR UNINTENDED CURVATURE IN THE TENDONS.

CONCRETE FOR PRESTRESSING


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CONCRETE OF HIGHER COMPRESSIVE STRENGTH IS USED FOR PRESTRESSED STRUCTURES. MOST OF THE PRESTRESSED CONSTRUCTIONSPECIFY A COMPRESSIVE STRENGTH OF CONCRETE BETWEEN (4,000 to 6,000 psi) 280-422 kg/cm2 BECAUSE OF THE FOLLOWING ADVANTAGES THAT ITOFFERS.

A) HIGH STRENGTH CONCRETE HAS A HIGHER MODULUS OF ELASTICITY. IT MINIMIZE THE REDUCTION OF PRESTRESS LOSS.

B) INCREASING THE COMPRESSIVE STRENGTH OF THE CONCRETE MEETS THE PROBLEM OF HIGH BEARING STRESSES AT THE ENDS OFPOST AND BEAM WHERE THE PRESTRESSING FORCE IS TRANSFERRED FROM THE TENDON TO THE ANCHORAGE DOWELS WHICHDIRECTLY BEARS AGAINST THE CONCRETE.

C) HIGH STRENGTH CONCRETE DEVELOPS STRONGER BOND PRESTRESSES TO PRETENSIONING CONSTRUCTION.

D) HIGH STRENGTH CONCRETE GIVES HIGHER STRENGTH TO PRECAST CONSTRUCTION WHEN CURING IS CAREFULLY CONTROLLED.

MEASUREMENT OF PRESTRESSING FORCE

PRESTRESSING FORCE COULD BE DETERMINED BY:

1. MEASURING THE TENDON ELONGATION.

2. EITHER BY CHECKING JACK PRESSURE ON A CALIBRATED GAGE OR LOAD CELL OR BY THE USED OF CALIBRATED DYNAMOMETER.

POST TENSIONING THE STRESSING OF UNBONDED TENDONS AFTER CONCRETE HAS CURED.

BUILDING MATERIALS

WOOD MATERIALS

WOOD HAS DURABILITY AND BEAUTY. IT HAS GREAT ABILITY TO ABSORB SHOCKS FROM SUDDEN LOAD AND LIGHT IN WEIGHT WHICH ADAPTABLE IN ACOUNTLESS VARIETY OF PURPOSES.

TWO MAJOR CLASSIFICATION OF WOOD:

SOFTWOOD THESE ARE USED FOR GENERAL CONSTRUCTION.

HARDWOOD THESE ARE USED FOR FLOORING, STAIRS, PANELLING, FURNITURES AND INTERIOR TRIM.

PROPERTIES OF WOOD:

HARDNESS MEASURED BY THE COMPRESSION, WHICH A PIECE UNDERGOES WHEN A WEIGHT IS APPLIED.

FLEXIBILITY THE AMOUNT A PIECE WILL BEND BEFORE BREAKING.

STRENGTH TO THE GRAIN.

DURABILITY THE RELATIVE VALUE / LIFESPAN OF WOOD.

DEFECTS OF LUMBER:


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DECAY CAUSED BY THE ATTACKED OF FUNGI.

CHECKS CRACKS OR LENGTH WISE SEPARATION ACROSS THE ANNUAL RINGS OF GROWTH.

KNOTS IRREGULAR GROWTHS IN THE BODY WHICH INTERRUPS SMOOTH CURVE.

PITCH POCKETS WELL REFINED OPENINGS BETWEEN ANNUAL RINGS CONTAINING SOLID OR LIQUID PITCH.

WANE IS THE LACK OF WOOD ON THE EDGE OR CORNER OF A PIECE.

TYPES OF WARPING:

CUPPING IS A DISTORTION OF THE BOARD IN WHICH THE FACE IS CONVEX/CONCAVE ACROSS THE BOARD.

BOWING IS A DISTORTION OF THE BOARD IN WHICH THE FACE IS CONVEX/CONCAVE LONGITUDINALLY.

TWISTING IS A DISTORTION OF THE BOARD IN WHICH ONE CORNER IS RAISED.

DEFINITION OF TERMS:

STRIPS PIECES LESS THAN 2 THICK AND LESS THAN 8 WIDE.

BOARDS PIECES LESS THAN 2 THICK AND AT LEAST 8 W IDE.

DIMENSION LUMBER PIECES MORE THAN 2 THICK AND LESS THAN 5 IN ANY DIMENSION.

TIMBER PIECES 4 OR MORE ON THE SMALLEST DIMENSION.

LOG PIECES 12 OR MORE ON THE SMALLEST DIMENSION.

THREE CATEGORIES OF LUMBER:

YARD LUMBER USED FOR ORDINARY LIGHT CONSTRUCTION AND FINISHING WORK. COMMONLY USED FOR FLOORING, PLANK SIDING,TRIM AND MOULDING.

SHOP LUMBER IT IS INTENDED FOR USE IN SHOPS OR IN MILLS MAKING SASH, DOORS, AND CABINETS.

STRUCTURAL LUMBER IS INTENDED FOR USE IN HEAVY CONSTRUCTION FOR LOAD-BEARING PURPOSES AND IS CUT INTO TIMBERS OFLARGER SIZE.

WOOD GRAIN:

EDGE GRAIN ANNUAL RINGS RUN APPROX. AT RIGHT ANGLE TO THE FACE.

FLAT GRAIN WHEN THE ANNUAL RINGS RUN MORE OR LESS PARALLEL TO THE SURFACE.

ANGLE GRAIN WHEN THE ANNUAL RINGS ARE AT ABOUT 45 DEG. TO THE FACE.

SEASONING OF LUMBER:


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AIR DRYING LUMBER IS STRIP-PILED AT ASLOPE ON ASOLID FOUNDATION. THIS ALLOWS AIR TO CIRCULATE AROUND EVERY PIECE WHILETHE SLOPING ALOOWS WATER TO RUN OFF QUICKLY.

KILN-DRYING MORE EXPENSIVE LUMBER WHICH IS REQUIRED FOR MORE REFINED USES SO AS WOOD WILL NOT MOVE. IT MUST BEDRIED TO A MOISTURE CONTENT OF NOT MORE THAN 5 TO 10 PERCENT. THIS IS DONE IN AN AIRTIGHT STRUCTURE SCIENTIFICALLYHEATED BY STEAM PIPES IN WHICH THE LUMBER IS ARTIFICIALLY DRIED TO THE CORRECT MOISTURE CONTENT.

MANUFACTURE BOARDS:

MANUFACTURED BOARDS ARE MADE OF WOOD BUT DOES NOT APPEAR IN THEIR NATURAL STATE. THIS TYPE OF BUILDING MATERIALS CANBE CLASSIFIED AS A TYPE OF LUMBER AS THEY ARE THE BY-PRODUCT IN THE MANUFACTURE OF LUMBER. THE COMPLETE UTILIZATION OF WOOD HASLEAD TO AN EXPANDED FIELD OF MANUFACTURED BOARDS .

TYPES OF BOARDS:

PLYWOOD IS MADE OF AN ODD NUMBER VENEER SHEETS GLUED TOGETHER WITH THE GRAINS RUNNING AT RIGHT ANGLE TO EACHOTHER. IT IS LIGHT IN WEIGHT AND STRONG THAT SCREW OR NAIL CAN BE DRIVEN CLOSE TO THE EDGES WITHOUT DANGER OFSPLITTING.

THE DIFF. TYPES OF PLYWOOD:

SOFT PLYWOOD - THE MOST COMMON FOR STRUCTURAL USE

HARDWOOD PLYWOOD ARE USED FOR PANELLING AND FINSHING WHERE USUALLY ON ONE FACE IS HARD FINISHED.

EXTERIOR OR MARINE PLYWOOD IS MADE FOR EXTERNAL USE.

HARDBOARD IS MADE FROM WOOD CHIPS WHICH ARE EXPLODED INTO FIBERS UNDER STREAM OF HIGH PRESSURE. THE LINING IN THEWOOD ITSELF BINDS PRESSED WOOD TOGETHER WITH NO FILLERS OR ARTIFICIAL ADHESIVES APPLIED. PRESSED WOOD IS EQUALLYSTRONG IN ALL DIRECTIONS BUT VERY BRITTLE. ITS COLOR VARIES FROM LIGHT TO DARK BROWN.

PARTICLE BOARD IS MANUFACTURES FROM WOOD CHIPS, CURLS, FIBERS, FLAKES, STRANDS, SHAVING, SLIVERS ETC. BOUNDTOGETHER AND PRESSED INTO SHEETS AND OTHER MOLDED SHAPED. PARTICLE BOARD HAS EQUAL STRENGTH IN ALL DIRECTION OF AGIVEN CROSS SECTIONAL AREA, IT IS NOT BRITTLE AND CAN RESIST WARPING.

MASONRY

MASONRY REFERS TO A MAN-MADE UNITS WHICH ARE FORMED AND HARDENED INTO MODULAR BUILDING UNITS.

BASIC BRICKWORK TERMINOLOGY:

COURSE IS A HORIZONTAL LAYER OF BRICKS OR OTHER MASONRY UNITS.

BED JOINT IS THE HORIZONTAL MORTAR IN EVERY COURSE.

HEAD JOINT IS THE VERTICAL MORTAR IN EVERY MASONRY UNIT.

STRETCHER IS A BRICK LAID WITH ITS FACE PARALLEL TO THE WALL AND ITS LONG DIMENSION HORIZONTAL.

HEADER IS A BRICK LAID SO AS TO BOND TWO WYTHES TOGETHER.

WYTHE IS A VERTICAL LAYER OF MASONRY UNITS, ONE UNIT THICK.

SOLDIER IS A BRICK LAID ON ITS END WITH ITS FACE PARALLEL TO THE WALL.

ROWLOCK IS A BRICK LAID ON ITS FACE WITH ITS END VISIBLE IN THE WALL FACE.


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STRUCTURAL BONDS FOR BRICKWORK:

RUNNING BOND CONSISTS ENTIRELY OF STRETCHERS.

COMMON BOND HAS A HEADER COURSE EVERY SIXTH COURSE

ENGLISH BOND ALTERNATES COURSES OF HEADERS AND STRETCHERS.

FLEMISH BOND ALTERNATES HEADERS AND STRETCHERS IN EACH COURSE.

JOINT TOOLING PROFILES FOR BRICKWORK:

WEATHERED JOINT CONCAVE JOINT VEE JOINT

FLUCH JOINT RAKED JOINT STRIPPED JOINT

STRUCK JOINT

REINFORCED BRICK MASONRY

A REINFORCED BRICK WALL IS CREATED BY CONSTRUCTING TWO WYTHES OF BRICK 50 100mm APART, PLACING THE REINFORCING STEEL INTHE CAVITY, AND FILLING CAVITY WITH GROUT. GROUT IS A MIXTURE OF CEMENT, AGGREGATES, AND WATER.

BRICK BOUNDS

THE METHOD OF LAYING BRICKS IN A WALL IN ORDER TO FORM SOME DISTINCTIVE PATTERN OR DESIGN IS REFERRED TO AS THE

PATTERN BOND.

THE METHOD BY WHICH THE INDIVIDUAL UNITS IN A BRICK STRUCTURE ARE TIED TOGETHER EITHER BY OVERLAPPING OR BY METAL TIESIS KNOWN AS THE STRUCTURAL BOND.

THE ADHESION OF MORTAR TO BRICKS OR TO STEEL REINFORCEMENT USED IN CONJUNCTION WITH THEM IS CALLED THE MORTAR BOND.

CONCRETE HOLLOW BLOCKS :

CONCRETE HOLLOW BLOCKS ARE CLASSIFIED AS BEARING AND NON-BEARING BLOCKS. LOAD BEARING BLOCKS ARE THOSE WHOSETHICKNESS RANGES FROM 15 CM. TO 20 CM. AND ARE USED TO CARRY LOAD ASIDE FROM ITS OWN WEIGHT. NON-BEARING BLOCKS ON THE OTHER HAND,

ARE BLOCKS WHICH ARE INTENDED FOR WALLS, PARTITIONS, FENCES OR DIVIDERS CARRYING ITS OWN WEIGHT WHOSE THICKNESS RANGES FROM 7.5CM. TO 10 CM.

CONCRETE HOLLOW BLOCKS HAS THREE CELLS AND TWO ONE HALF CELLS AT BOTH ENDS HAVING A TOTAL OF FOUR.

CONCRETE CEMENTS


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PORTLAND CEMENT

MADE FROM MATERIALS WHICH MUST CONTAIN IN THE PROPER PROPORTIONS OF LIME, SILICA, ALUMINA AND IRON COMPONENTS. FOUR PARTS OFLIMESTONE TO ONE PART CLAY ARE BASIC INGREDIENTS. THESE ARE MIXED, BURNED THEN PULVERIZED. PORTLAND CEMENT IS SOLD EITHER INCEMENT BAGS OF 40 & 50 KILOS WEIGHT OR IN BULK INTO CEMENT TRUCKS.

SPECIAL CEMENTS

WHITE PORTLAND CEMENT SAME MATERIALS AS NORMAL PORTLAND EXCEPT IN COLOR. THE MANUFACTURING PROCESS IS CONTROLLED TO

PRODUCE A PURE WHITE, NON-STAINING CEMENT. IT IS USED PRIMARILY FOR ARCHITECTURAL PURPOSES SUCH AS CURTAIN WALL AND FACINGPANELS, DECORATIVE CONCRETE STUCCO AND TILE GROUT, OR WHEREVER WHITE OR COLORED CONCRETE OR MORTAR IS SPECIFIED.

MASONRY CEMENT OR TILE ADHESIVES HAS BEEN SPECIALLY DESIGNED TO PRODUCE BETTER MORTAR THAN THAT MADE WITH NORMALPORTLAND CEMENT OR WITH A LIME-CEMENT HAS PARTICULARLY GOOD PLASTICITY AND WORKABILITY, GOOD ADHESION AND BOND.

WATERPROOFED PORTLAND CEMENT NORMALLY PRODUCED BY ADDING A SMALL AMOUNT OF STEARATE, USUALLY CALCIUM OR ALUMINUM TOTHE CEMENT CLINKER DURING THE FINAL GRINDING.

TYPES OF AGGREGATES USED IN CONCRETE

CONCRETE CAN BE CONSIDERED TO BE AN ARTIFICIAL STONE MADE BY BINDING TOGETHER PARTICLES OF SOME INERT MATERIAL WITH APASTE MADE OF CEMENT AND WATER. THESE INERT MATERIAL ARE THE AGGREGATE. AGGREGATES USED ARE SAND, GRAVEL CRUSHED STONE,

CINDER. CRUSHED FURNACE SLAG, BURNED CLAY, EXPANDED VERMICULITE, AND PERLITE.

SAND - FOUND IN RIVERBEDS, FREE OF SALT

AND MUST BE WASHED.

FINE AGGREGATE - AND SMALLER DIAMETER STONES.

COARSE AGGREGATE - BIGGER THAN DIAMETER STONES.

CONCRETE MIXES

CLASS AA - 1: 1 : 3 - CONCRETE UNDER WATER, RETAINING

WALLS

CLASS A - 1:2:4 - FOOTINGS, COLUMNS BEAMS, R.C.

SLABS

CLASS B - 1: 2 1/ 2:5- SLAB ON FILL, NON BEARING WALLS

CLASS C - 1: 3: 6 - CONCRETE PLANT BOXES, ETC.

CONTROL OF CONCRETE MIXES


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SLUMP TEST - WHEN FRESHLY MIXED CONCRETE IS CHECKED TO ENSURE THAT THE SPECIFIED SLUMP IS BEING ATTAINED CONSISTENTLY. A STANDARDSLUMP CONE IS 12 INCHES HIGH (0.30) AND 8 INCHES (O.20) IN DIAMETER AT THE BOTTOM AND 4 INCHES (O.10) ON TOP WHICH IS OPEN ON BOTH ENDS.

THE CONE IS FILLED IN THREE EQUAL LAYERS, EACH BEING TAMPED OR RODDED 25 TIMES WITH A STANDARD 5/8 BULLET NOSED ROD. WHENTHE CONE HAS BEEN FILLED AND LEVELED OFF, IT IS LIFTED CAREFULLY AND THE AMOUNT OF SLUMP IS MEASURED.

ALLOWABLE DEFLECTION X

BEAMS AND COLUMNS 7.5 cm. (.075) 3

SLABS AND TUNNEL INVERTS 5.0 cm. (.50) 2

TOPS AND WALL, PIERS, PARAPET & CURBS 5.0 cm. (.50) 2

SIDE WALLS AND ARCH IN TUNNEL LINING 10.0 cm. (.10) 4

CANAL LINING 7.5 cm. (.075) 3

HEAVY MASS CONSTRUCTION 5.0 cm. (.50) 2

COMPRESSIVE STRENGTH TEST - COMMON QUALITY-CONTROL TEST OF CONCRETE, BASED ON 7 AND 28 DAYS CURING PERIODS. SPECIMENS AREUSUALLY CYLINDRICAL WITH A LENGHT EQUAL TO TWICE THE DIAMETER. STANDARD SIZE IS 12 INCH. HIGH AND 6 INCH. DIAMETER. FILLING IS DONE THESAME WAY AS THE SLUMP TEST BUT TAKEN OUT FROM THE MOLD IN 24 HOURS. IT IS THEN SENT TO A COMPRESSION TESTING LABORATORY, BY MAKINGTHE CYLINDER WHILE STILL WET. SOME COMPRESSIVE STRESSES ARE 2,000 psi, 2,500 psi, 3,000 psi.

SOME OF THE BRANDS OF PORTLAND CEMENT

ISLAND CEMENT

CONTINENTAL CEMENT

HI- CEMENT

UNION CEMENT

RIZAL CEMENT

FILIPINAS CEMENT

PACIFIC CEMENT

FORTUNE CEMENT

REPUBLIC CEMENT

NORTHERN CEMENT

BRANDS OF WHITE CEMENT

PRIME WHITE CEMENT

KEENE

TRINITY


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SNOWCRETE

MORTAR CEMENT, SAND & WATER.

GROUT CEMENT AND WATER MIXTURE.

CONCRETE CEMENT, SAND, GRAVEL & WATER.

TYROLEAN FINISH ROUGH PLASTER FINISH OBTAINED BY FLINGING PLASTER ON A WALL W/ A HAND OPERATED MACHINE.

EFFLORESCENCE AN ENCRUSTATION OF SOLUBLE SALTS CAUSED BY FREE ALKALIES LEACHED FROM MORTAR OR ADJACENT CONCRETE ASMOISTURE MOVE THROUGH IT.

ADIABATIC CURING - THE CURING OF CONCRETE OR MORTAR W/O THE GAIN OR LOSS OF HEAT DURING THE CURING PERIOD.

WHEATHERED MOST WATERPROOFED TYPE OF MORTAR JOINTS FOR WALLS.

ADOBE BRICK LARGE ROUGHLY MOULDED SUN DRIED CLAY BRICKS OF VARYING SIZES.

ASHLAR BRICK A BRICK WHOSE FACE HAS BEEN HACKED TO RESEMBLE ROUGHLY HACKED STONE.

RETARDER AN ADMIXTURE WHICH DELAY THE SETTING OF CEMENT PASTE OR MIXTURES/ AN ADDITIVE MIXED WITH PLASTER TO CONTROL THERATE OF HARDENING.

STEAM CURING THE CURING OF CONCRETE OR MORTAR IN WATER VAPOR AT AN ELEVATED TEMPERATURE AT EITHER ATMOSPHERIC OR HIGHPRESSURE.

QUOIN / COIN IN MASONRY, A HARD STONE OR BRICK USED TO REINFORCE AN EXTERNAL CORNER OF A WALL.

ZOCALO LOW WALL AROUND A CHALET-TYPE HOUSE.

FORTIFICATION THA WALL OF INTRAMUROS.

SCRATCH COAT INITIAL SCORED LAYER OF PLASTER WORK.

CINDER BLOCK A LIGHT WEIGHT MASONRY UNIT MADE OF CINDER CONCRETE.

MORTAR FOR BLOCK LAYING IS 0.0125 m.

PLASTERING THICKNESS IS 0.016 m.

MORTAR FILLER FOR HOLLOW CELL 0.05 X 0.075 X 0.20 = 0.00075 cu.m.

FOR 4 CELL/BLOCK = 0.00075 X 4 = 0.003 cu.m. FOR 4 CHB.

FERROUS AND NONFERROUS METALS

FERROUS - METAL IN WHICH IRON IS THE PRINCIPAL ELEMENT.

NONFERROUS - CONTAINING NO, OR VERY LITTLE IRON.

FERROUS METAL:

STEEL - A MALLEABLE ALLOY OF IRON AND CARBON PRODUCED BY MELTING AND REFINING PIG IRON AND/ OR SCRAP STEEL, GRADED ACCORDING TO THECARBON CONTENT.

PRODUCE BY THREE BASIC RAW MATERIALS, IRON ORE, AND LIMESTONE. FIVE PARTICLES OF ALL THREE BASIC INGREDIENTS OF STEEL, WHICHOTHERWISE WOULD BE WASTE, ARE BLENDED AND BURNED ON A MOVING GATE TO CAUSE THE FORMATION OF CLINKERS. THESE ARE CALLED SINTER, AHIGH- GRADE BLAST-FURNANCE CHARGE MATERIAL.

FROM THESE, RAW MATERIALS WHICH IS MELTED INTO INGOTS PLACE IN MOLDS, A GRAT VARIETY OF PRODUCTS USED IN CONSTRUCTION AREMADE. THEY INCLUDED:


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COLD-ROLLED SHEETS ARE GALVANIZED (GIVEN A ZINC COATING). PIG IRON IS USED TO MAKE CAST IRON WHICH IS HIGH IN COMPRESSIVESTRENGHT BUT LOW IN TENSILE STRENGHT, AND HAS LITTLE USE FOR CONSTRUCTION. HOWEVER SINCE IT IS CHEAP AND EASY TO CAST, IT IS USEDFOR PUMPS, MOTORS, ENGINES AND BECAUSE OF ITS CORROSION RESISTANCE IT IS USED FOR PIPES TO SOME EXTENT.

WROUGHT IRON IS PRODUCED WHEN PIG IRON IS MELTED IN SUCH A WAY AS TO REMOVE NEARLY ALL OF THE CARBON AND OTHER IMPURITIES. IT ISEASILY WORKED AND IS TOUGH AND DUCTILE. ITS MAIN USES ARE FOR WIRE AND METAL ORNAMENTS.

STAINLESS STEELS ARE MADE WITH CHROMIUM OR A COMBINATION OF NICKEL AND CHROMIUM USED IN BUILDINGS OF EXTERIOR WALLS PANELS,FRAMES FOR DOORS EXPANSION JOINTS, FLASHING, COPINGS, FASCIA AND GRAVEL STOPS.

COPPER - BEARING STEEL HAS HIGH RESISTANCE TO CORROSION AND IS USED FOR MAKING SHEET STEEL AND METAL LATH.

STEEL PRODUCTS

ROLLED STRUCTURAL SHAPES

SHEET PILING- SECTIONS ARE MADE TO INTERLOCK AND ARE AVAILABLE IN SEVERAL SHAPE.

STEEL PIPE- SEAMLESS OR WELDED SMALL DIAMETER PIPE AND ELECTRICALLY WELDED LARGE DIAMETER PIPE.

REINFORCING STEEL- MADE FROM NEW STEEL OR FROM DISCARDED RAILWAY- CAR AXLES OR RAILS.

REINFORCING STEEL COMES IN PLAIN OR DEFORMED BARS, THAT IS, BARS WHICH HAVE LUGS OR DEFORMATIONS ROLLED ON THE SURFACETO PROVIDE ARCHORAGE IN CONCRETE.

SIZES-START WITH NO.2 OR in. (DIVIDE A NUMBER OF BAR BY 8 TO GET THE EQUIVALENT IN inch DIAMETER)

No. 2= = 6 mm.

No. 3= 3/8 = 10 mm.

No. 4= = 12mm.

No. 5= 5/8 = 16mm.

No. 6= = 20mm.

No. 7= 7/8 = 22mm.

No. 8= 1 = 25mm.

No. 9= 1 1/8 = 30mm.

WELDED WIRE FABRIC- ANOTHER TYPE OF REINFORCING MATERIAL. IT CONSISTS OF PARALLEL, LONGITUDINAL WIRES WELDED TOTRANSVERSE WIRES AT REGULAR INTERVALS.

STEEL WIRE OVER 150,000 USES FOR WIRE INCLUDING PINS, NEEDLES, NAILS, BOLTS, CABLES, PIANO WIRE, FENCES.

BOLTS AND NUTS (EITHER HOT FORGED OR COLD-FORMED FROM WIRE OF THE APPROPRIATE DIAMETER). FOR BOLTS, WIRE IS FED INTO AN AUTOMATIC BOLT-MAKING MACHINE WHICH CUTS TO LENGTH HEADS, TRIMS, POINTS, AND IN MANY ROLLS THE THREAD.


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STEEL STRAPPING MADE FROM HIGH-TENSILE FLAT WIRE IN A NUMBER OF SIZES. USED FOR BANDING COLUMN FORMS TO KEEP THEM FROMBULGING UNDER THE PRESSURE OF FRESHLY POURED CONCRETE. A TIGHTERNER TIGHTENS IT AND THE TWO LAPPED ENDS IS SEALED.

OPEN WEB STEEL JOISTS LIGHTWEIGHT WARREN-TYPE TRUSSES MADE IN SEVERAL DIFFERENT STYLES.

SHEET STEEL BLACK AND GALVANIZED, CAN BE USED TO MANUFACTURE CORRUGATED ROOFING AND SIDING AND FORMED STEEL DECKING.

STEEL STUDS LIGHTWEIGHT, REQUIRING MINIMUM STORAGE SPACE AND DOES NOT WARP OR SHRINK. FASTENERS DO NOT POP, ANDJOINTS STAY CLOSED. MUCH FASTER TO INSTALL THAN WOOD STUD INSTALLATION. AVAILABLE IN 1 5/8, 2 AND 3 5/8 INCHES. PLUMBINGSTACKS AND ELECTRICAL COMPONENTS FIT EASILY INTO A STEEL-FRAMEWALL.

PANS AND DONES MANUFACTURED FOR USE IN FORMING ONE-WAY AND TWO-WAY RIBBED CONCRETE FLOOR SYSTEMS.

NONFERROUS METALS:

ALUMINUM ITS ORE, BAUXITE, REQUIRES 10 KILOWATT HOURS FOR EACH POUND OF METAL ALUMINUM EXTRACTED. THE REDDISH BROWN ORE ISWASHED AND TREATED IN A SODA SOLUTION TO YIELD A CHALKY-WHITE POWDER CALLED ALUMNA, CONTAINING A HIGH CONCENTRATION OF ALUMINUM.

ALUMINUM FOIL USED AS A VAPOR BARRIER ON WALLS AND CEILINGS AND AS REFLECTIVE INSULATION .

COPPER A LUSTROUS REDDISH METAL, HIGHLY DUCTILE AND MALLEABLE; HAS HIGH TENSILE STRENGTH, IS AN EXCELLENT ELECTRICAL ANDTHERMAL CONDUCTOR, IS AVAILABLE IN A WIDE VARIETY OF SHAPES; WIDELY USED FOR DOWNSPOUTS, ELECTRICAL CONDUCTORS, FLASHINGSGUTTERS, ROOFING, ETC.

COPPER ALLOYS ARE BRASSES, AND BRONZES WHICH CONTAIN PRIMARILY ZINC AND TIN, RESPECTIVELY, AND THE ALLOYSCONTAINING NICKEL.

BRASSES ARE USED IN ARCHITECTURAL AND HARDWARE APPLICTIONS. BRONZES ARE USED IN THE PRODUCTION OF SPRINGS.

LEAD A SOFT, MALLEABLE, HEAVY METAL; HAS LOW MELTING POINT AND A HIGH COEFFICIENT OF THERMAL EXPANSION. VERY EASY TO CUT AND WORK, ENABLING IT TO BE FITTED OVER UNEVEN SURFACES. USED FOR ROOFING, FLASHING AND SPANDREL WALL PANELS.

TIN A LUSTROUS WHITE, SOFT AND MALLEABLE METAL HAVING A LOW MELTING POINT; RELATIVELY UNAFFECTED BY EXPOSURE TO AIR; USEDFOR MAKING ALLOYS AND SOLDER AND IN COATING SHEET METAL.

STRUCTURAL SHAPES

THE MOST COMMON SHAPES OF STRUCTURAL STEEL USED IN BUILDING CONSTRUCTION ARE THE AMERICAN STANDARD FORMS SUCH AS:

1. SQUARE BARS 6. I-BEAM

2. ROUND BARS 7. TEE BEAM

3. PLATE BARS 8. H-COLUMN

4. ANGLE BARS 9. WIDE FLANGES

5. CHANNELS 10. ZEE


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STANDARD CHANNEL

THE STANDARD CHANNEL HAS THE SHAPE OF UNSYMMETRICAL BALANCE CONSISTING OF TWO FLANGES ON ONE SIDE. IT THEREFOREREQUIRES LATERAL SUPPORT TO PREVENT ITS TENDENCY TO BUCKLE. THE STANDARD CHANNELS ARE GENERALLY USED AS ELEMENTS OF BUILT-UPSECTIONS FOR COLUMNS AND ARE ALSO SUITABLE FOR FRAMING AROUND FLOOR OPENINGS, SPANDRELS, AND LINTELS ATTRIBUTED TO THE ABSENCEOF FLANGE ON THE OTHER SIDE. THE CHANNEL SECTION IS IDENTIFIRD AS C 15 x 20 WHICH MEANS THAT THE CHANNEL HAS A DEPTH OF 20 cm. ANDWEIGHTS 15 kg. PER METER LENGTH.

WIDE FLANGE

WIDE FLANGE SECTIONS ARE DESIGNATED AS W 12 x 24 WHICH MEANS THAT THE FLANGE HAS A DEPTH OF 24 cm. AND IT WEIGHS 12 kg. PERMETER LENGTH. ALL WIDE FLANGE SECTIONS ARE GENERALLY WITH PARALLEL FACE FLANGE EXCEPT THOSE WITH 5% SLOPE INSIDE FACE PRODUCEDBY BETLEHEM STEEL COMPANY. COMPARATIVELY, WIDE FLANGE SECTIONS ARE MORE EFFICIENT THAN STANDARD I BEAM WITH RESPECT TO BENDINGRESISTANCE.

STANDARD I-BEAM

THE USE OF I-BEAM AS A COLUMN IS UNECONOMICAL, BECAUSE THE WHIRL OR REVOLVING ACTION OF THE STRUCTURE ABOUT AN AXISTHROUGH THE CENTROID PARALLEL TO THE W AB OF THE I-BEAM IS COMPARATIVELY SMALL.

H-BEARING PILES

H-BEARING PILES ALTHOUGH SUITABLE FOR PILE DRIVING ON DEEP EXCAVATIONS IS MUCH MORE SUITABLE THAN THE I-BEAM FOR COLUMNS.

ZEE SECTIONS

THE ZEE SECTION IS ANOTHER STRUCTURAL FORM IN A LETTER Z WHICH IS NOT FREQUENTLY USED IN BUILDING CONSTRUCTION EXEPT ONTHE FABRICATION OF STEEL WINDOWS AND OTHER FRAMES.

WROUGHT IRON A COMMERCIALLY PURE IRON OF FIBROUS NATURE, VALUED FOR ITS CORROSION RESISTANCE AND DUCTILITY.

CAST IRON AN IRON ALLOY USUALLY INCLUDING CARBON AND SILICON WHICH HAS HIGH COMPRESSIVE STRENGTH BUT LOW TENSILE STRENGTH.

WELDING IS THE PROCESS BY WHICH TWO METALS ARE SO JOINT THAT THERE IS AN ACTUAL UNION OF THE INTERATOMIC BONDS.

EXTRUSION THE PROCESS OF PRODUCING METAL SHAPES OF A CONSTANT CROSS SECTION BY FORCING THE HOT METAL THROUGH AN ORFICE IN A DIE BY MEANS OF A PRESSURE RAM.

RED OXIDE PROTECTIVE COAT FOR IRON.

LAP SEAM A JOINT FORMED BY OVERLAPPING THE EDGES OF METAL SHEET OR PLATES AND JOINING THEM BY RIVETING OR SOLDERING ORBRACING.

JOINING STEEL MEMBERS

STEEL SHAPES CAN BE JOINED INTO A BUILDING FRAME WITH ANY OF THREE FASTENING TECHNIQUES.


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RIVETS

A RIVETS IS A FASTENER CONSISTING OF A CYLINDRICAL BODY AND A FORMED HEAD WHICH IS BROUGHT TO A WHITE HEAT, INSERTEDTHROUGH HOLES IN THE MEMBERS TO BE JOINED, AND HOT-WORKED WITH A PNEUMATIC HAMMER TO PRODUCED A SECOND HEAD OPPOSITE THEFIRSTHEAD.

PROCESS OF RIVETING:

A) A HOT STEEL RIVET IS INSERTED IN HOLES THROUGH THE TWO MEMBERS TO BE JOINED,

B) ITS HEAD IS THEN HELD WITH HAND HAMMER WITH A CUP-SHAPED DEPRESSION,

C) WHILE A PNEUMATIC HAMMER DRIVES A RIVET SET REPEATEDLY AGAINST THE BODY OF THE RIVET TO FORM THE SECOND HEAD,

D) THE RIVET SHRINKS AS IT COOLS, DRAWING MEMBERS TIGHTLY TOGETHER.

BOLTS

THE BOLTS COMMONLY USED IN STEEL FRAME CONSTRUCTION FALL INTO TWO GENERAL CATEGORIES:

1) CARBON STEEL BOLTS OR COMMON BOLTS ARE SIMILAR TO THE ORDINARY MACHINE BOLTS THAT CAN BE PURCHASED INHARDWARE STORES.

2) HIGH-STRENGTH BOLTS ARE HEAT TREATED DURING MANUFACTURE TO DEVELOP THE NECESSARY STRENGTH. IT IS USUALLYTIGHTENED USING PNEUMATIC OR ELECTRIC IMPACT WRENCH.

A MAJOR PROBLEM IN HIGH-STRENGTH BOLTING OR FRICTION-TYPE CONNECTIONS IS HOW TO VERIFY THE NECESSARY TENSION HAS BEEN ACHIEVED IN ALL THE BOLTS IN A CONNECTION.

SEVERAL WAY TO ACHIEVED PROPER TIGHTENING:

TURN-OF-NUT METHOD

LOAD INDICATOR WASHER

TENSION CONTROL BOLTS

PROCESS OF TIGHTENING A TENSION CONTROL BOLT:

A) THE WRENCH HOLDS BOTH THE NUT AND THE SPLINED BODY OF THE BOLT, AND TURNS THEM AGAINST ONE ANOTHER TO TIGHTEN THE BOLT,

B) WHEN THE REQUIRED TORQUE IS ACHIEVED, THE SPLINED END TWISTS OFF IN THE WRENCH,

C) A PLUNGER INSIDE THE WRENCH DISCHARGES THE SPLINED END INTO A CONTAINER.

WELDING


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WELDING CAN JOIN THE MEMBERS OF A STEEL FRAME AS IF THEY WERE A MONOLITHIC WHOLE. WELDED ARE STRONGER THAN THE MEMBERS THEY JOININ RESISTING BOTH SHEAR AND MOMENT FORCES.

TYPICAL WELDS USED IN STEEL FRAME CONSTRUCTION:

FILLET WELD

DOUBLE FILLET WELD

DOUBLE-BEVEL GROOVE WELD

SINGLE-BEVEL GROOVE WELD WITH BACKUP BAR

V-GROOVE W ELD

V-GROOVE WELD WITH BACKUP BAR

PUDDLE WELD

PARTIAL-PENETRATION SINGLE-BEVEL GROOVE WELD

THE BASIC SYBOLS ARE:

BACK FILLET PLUG OR SLOT

GROOVE OR BUTT

SQUARE V BEVEL U J FLARE V FLARE BEVEL

THE ARROW

THE REFERENCE LINE CARRIES THE DESCRIPTIVE SYMBOLS

THE ARROW POINTS TO THE WELD

THE BASIC SYMBOLS

THE BASIC WELD SYMBOL IS LOCATED ON EITHER SI DE OF THE REFERENCE LINE AS FOLLOWS:

SYMBOLS ON THE TOP OF THE REFERENCE LINE REFER TO WELDS ON THE SIDE OF THE JOINT OPPOSITE THE


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ARROW

SYMBOLS ON THE BOTTOM OF THE REFERENCE LINE

REFER TO WELDS ON THE SAME SIDE OF THE JOINT AS

AS THE ARROW

SUPPLEMENTARY SYMBOLS

FIELD WELD THIS WELD BE DONE IN THE FIELD DURING ERECTION. OTHER WELDS ARE DONE EARLIER IN THE FABRICATORS SHOP.

WELD ALL AROUND THIS INDICATES THAT THE WELD SHOULD BE CARRIED FULLY AROUND THE PERIMETER OF THE JOINING PIECES.

BACKUP BAR AS INDICATED IN THIS EXAMPLE, A BACKUP BAR TO SUPPORT THE FIRST PASS OF THE WELD MUST BE PLACED ON THE SIDE OF THE JOINTOPPOSITE THE ARROW.

SPACER SMALL METAL SPACERS ARE USED TO MAINTAIN A GAP BETWEEN THE PIECS TO BE JOINED, PRIOR TO WELDING.

A SHARP BEND NEAR THE END OF THE ARROW INDICATES THAT THE ARROWHEAD IS POINTING TOWARD THE GROOVED SIDE OF THE BEVEL OR J-GROOVED JOINT

GLASS

THE MAJOR INGREDIENT OF GLASS IS SAND (SILICON DIOXIDE). A HARD BRITTLE INORGANIC SUBSTANCE, ORDINARILY TRANSPARENT ORTRANSLUCENT; PRODUCED BY MELTING A MIXTURE OF SILICA, A FLUX AND A STABILIZER; WHILE MOLTEN MAYBE BLOWN, DRAWN, ROLLED, PRESSED ORCAST TO A VARIETY OF SHAPES.

DURING ITS MANUFACTURED, ORDINARY WINDOW GLASS IS ANNEALED, COOLED SLOWLY UNDER CONTROLLED CONDITION, TO AVOID LOCKED-

IN THERMAL STRESSES THAT MIGHT CAUSE IT TO BEHAVE UNPREDICTABLY IN USE.

THICKNESSES OF GLASS

GLASS IS TYPICALLY MANUFACTURED IN A SERIES OF THICKNESSES RANGING FROM APPROXIMATELY 2.5mm, THROUGH 3mm, IS CALLEDSINGLE-STRENGTH, OR 6mm TO 22mm, IS CALLED DOUBLE-STRENGTH, AND ON SPECIAL ORDER, 25mm IS AVAILABLE.

TYPES OF CLEAR GLASS


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1. TEMPERED GLASS

TEMPERED GLASS IS PRODUCED BY CUTTING ANNEALED GLASS TO THE REQUIRED SIZES FOR USE, REHEATING IT TO APPROXIMATELY 1200 DEGREES FAHRENHEIT, COOLING BOTH ITS SURFACES RAPIDLY W ITH A BLAST OF AIR WHILE ITS CORE COOLS MUCHMORE SLOWLY. ITS FOUR TIMES AS STRONG IN BENDING AND MORE RESISTANT TO THERMAL STRESS AND IMPACT.

2. HEAT-STRENGTHENED GLASS

THE HEAT STRENGTHENED PROCESS IS SIMILAR TO TEMPERING, BUT ITS, ABOUT ONE-THIRD AS HIGH AS TEMPERED GLASS IN TERMS

OF BENDING AND STRENGTH.

3. LAMINATED GLASS

ITS MADE BY SANDWICHING A TRANSPARENT VINYL INTERLAER BETWEEN SHEETS OF GLASS AND BONDING THE THREE LAYERS TOGETHERUNDER HEAT AND PRESSURE. WHEN ITS BREAKS, THE SOFT VINYL HOLDS THE SHARDS OF GLASS IN PLACE RATHER THAN ALLOWING THEM TOFALL OUT OF THE FRAME.

4. PATTERNED OR ROLLED AND ROUGH CAST GLASS

HOT GLASS CAN BE ROLLED INTO SHEETS WITH MANY DIFFERENT SURFACE PATTERNS FOR USE WHERE LIGHT TRANSMISSION IS DESIRED BUTVISION MUST BE OBSCURED FOR PRIVACY.

5. SPANDREL GLASS

SPECIAL OPAQUE GLASSES ARE PRODUCED FOR COVERING THE SPANDREL AREA (THE BANDS OF WALL AROUND THE EDGES OF FLOORS) INGLASS CURTAIN. IT IS USUALLY TEMPERED OR HEAT-STRENGTHENED TO RESIST THE THERMAL STRESSES THAT CAN CAUSED BY

ACCUMULATIONS OF SOLAR HEAT BEHIND THE SPANDREL.

6. WIRED GLASS

SIMPLY A ROLLED GLASS INTO WHICH WIRE MESH IS INSERTED DURING THE PROCESS OF MANUFACTURE. THE WIRE GREATLY INCREASES THERESISTANCE TO SHATTERING THROUGH IMPACT. ITS USE FOR SAFETY GLAZING, WHEN ITS BREAKS FROM THERMAL STRESS, THE WIRES HOLDTHE SHEET OF GLASS TOGETHER.

TINTED AND REFLECTIVE COATED GLASS

SOLAR HEAT BUILDUP CAN BE PROBLEMATIC IN THE INHABITED SPACES OF BUILDINGS WITH LARGE AREAS OF GLASS, ESPECIALLY DURING THEWARM PART OF THE YEAR. THIS IS USE TO REDUCE GLARE AND CUT DOWN ON SOLAR HEAT GAIN.

1) TINTED GLASS

TINTED GLASS IS MADE BY ADDING SMALL AMOUNTS OF SELECTED CHEMICAL ELEMENTS TO THE MOLTEN GLASS MIXTURE TO PRODUCE THEDESIRED HUE AND INTENSITY OF COLOR IN GRAYS, BRONZES, BLUES, GREEN, AND GOLDS.

2) REFLECTIVE COATED GLASS

REFLECTIVE COATED GLASS APPEAR AS MIRROR FROM THE OUTSIDE ON A BRIGHT DAY AND AT NIGHT, WITH LIGHTS ON INSIDE THE BUILDING,THEY APPEAR AS DARK BUT TRANSPARENT GLASS.


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3) INSULATING GLASS

A SECOND SHEET OF GLASS APPLIED TO A WINDOW WITH AN AIRSPACE BETWEEN THE SHEETS CUTS THIS RATE OF HEAT LOSS IN HALF. TWOKINDS OF EDGES SEALS ARE FUSED GLASS EDGES AND A METAL SPLINE AND ORGANIC SEALANT.

GLASS PRODUCTS

I. GLASS BLOCKS

COMPARABLE IN MANY WAYS TO UNIT MASONRY BUT HAVE THE ADDED FEATURE OF TRANSMITTING LIGHT. THEY ARE MADE INTO TWOSEPARATE HALVES, WHICH ARE HEAT-SEALED TOGETHER TO FORM A HOLLOW UNIT WITH REASONBLY HIGH THERMAL EFFICIENCY AND SOUNDINSULATION. THE EDGE SURFACES OF THE BLOCK ARE COATED WITH A GRITTY MORTAR BOND.

TWO TYPES:

1. FUNCTIONAL BLOCKS DIRECT OR DIFFUSE THE DAYLIGHT WHICH PASSES THEOUGH THEM TO IMPROVE THE ILLUMINATION OF THE BUILDINGINTERIOR.

THREE STYLES OF FUNCTIONAL BLOCKS:

A. A LIGHT DIRECTING BLOCK DIRECTS INCOMING LIGHT UPWARD TOWARD THE CEILING. USED ALWAYS ABOVE EYE LEVEL.

B. A LIGHT DIFFUSING BLOCK DIFFUSES INCOMING LIGHT EVENLY THROUGHOUT THE INTERIOR OF THE ROOM.

C. GENERAL PURPOSES BLOCK

2. DECORATIVELY OR ARCHITECTURAL GLASS AVAILABLE IN A WIDE RANGE OF STYLES AND PATTERNS. THESE GLASS MASONRY UNITS PROVIDE ALMOST UNLIMITED DESIGN VERSATILITY WHEN USED IN WINDOW, OPENINGS AND FACADES, AS INTERIOR WALLS AND DIVIDER PANELING.

PAINT FINISHES

THE PURPOSE OF A FINISH IS TO PROTECT, PRESERVE OR VISUALLY ENHANCE THE SURFACE TO WHICH IT IS APPLIED. FINISHES INCLUDEPLASTIC LAMINATED SURFACE COVERINGS SUCH AS PLASTIC LAMINATED AND VINYL OF FABRIC WALL COVERING.

PAINT GENERALLY REFERS TO OPAQUE OR CLEAR FILM-FORMING MATERIAL THAT ACTS AS A SHIELD OR BARRIER BETWEEN THE BUILDINGMATERIAL AND THOSE ELEMENTS OR CONDITIONS THAT MAY ADVERSELY AFFECTS OR DETERIORATE. THE PAINT FILM MUST RESIST DETERIORATION DUETO SUNLIGHT HEAT, TEMPERATURE VARIATIONS, WATER OR MOISTURE VAPOR, MILDEW AND DECAY CHEMICALS AND PHYSICAL ABRASION. PAINT MAY

ALSO SERVE TO MAKE SURFACES MORE SANITARY, IMPROVE HEATING AND LIGHTING EFFECTS, AND PROMOTE HUMAN COMFORT AND SAFETY.

WHEN USING PAINT, THE PHYSIOLOGICAL EFFECTS OF COLOR AND SURFACE TEXTURE MUST BE CONSIDERED. CERTAIN COLORS MAY BESTIMULATING WHILE OTHERS ARE RELAXING. WHITE AND LIGHT COLORS REFLECT SIZE OF FORM AND SPACE. DARK COLOR CAN INHIBIT THEPERCEPTION OF FORM AND MAY BE USED FOR CONTRAST. FLAT PAINT FINISHES SOFTEN AND DISTRIBUTE, ILLUMINATION EVENLY. GLOSSY FINISHESREFLECT LIGHT AND CAN CAUSE GLARE, BUT THEY ALSO PROVIDE SMOOTH, EASILY CLEANED, NON-ABSORPTIVE SURFACES.


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MOST PAINTS ARE CAREFULLY FORMULATED TO MEET SPECIFIC APPLICATION THAT USE REQUIREMENTS AND ARE READY-MIXED FOR APPLICATION EXCEPT FOR THINNING, STIRRING, OR THE ADDITION OF AN ACTIVATOR OR CATALYST. IT IS ALWAYS ADVISABLE THEREFORE TOFOLLOW THE PAINT MANUFACTURERS RECOMMENDATIONS IN THE APPLICATION AND USE OF A PAINT OR OTHER PROTECTIVE COATING.

PAINTS MAY BE CLASSIFIED ACCORDING TO :

MATERIAL TO WHICH IT IS APPLIED

WOOD, METAL MASONRY, CONCRETE, PLASTIC, ETC.,

SURFACE FINISH TEXTURE

GLOSS, SEMI-GLOSS, EGG SHELL, SATIN, FLAT,& VARNISH.

CONSIDERATIONS IN THE SELECTION AND USE OF A PAINT INCLUDE :

SURFACE PREPARATION- THE FOUNDATION OF ANY PAINT SYSTEM MUST BE PROPERLY PREPARED TO ENSURE PROPER ADHESION OF THE PAINT FILM TO ITS SURFACE. TYPE OF PAINT

- PAINT MUST BE COMPATIBLE WITH THE MATERIAL TO WHICH IT IS APPLIED.

- SPECIFICATIONS INCLUDE THE PAINT VEHICLE, FINISH COLOR, EXPOSURE, AND MANUFACTURER AND/OR TRADE NAME.

METHOD

- DEPENDING ON THE TYPE OF PAINT AND THE MATERIAL TO WHICH IT IS BEING APPLIED. COATINGS MAY BE BRUSHED, ROLLED OR SPRAYED ON.

DRYING

- THE TIME AND CONDITIONS NECESSARY FOR A PAINT TO DRY MUST BE CHECKED.

FILM THICKNESS

- THE DRY FILM THICKNESS (DFT) IS MORE IMPORTANT THAN THE NUMBER OF COATS.

- MULTIPLE THIN COATS ARE GENERALLY MORE EFFECTIVE THAN A SINGLE THICK COAT.

- A MINIMUM OF 2 COATS IS REQUIRED TO PRODUCE 5 MIL DFT.

COVERAGE

- A PAINTS COVERAGE CAN BE ESTIMATED BY ITS PERCENTAGE OF VOLUME SOLIDS:

- ie. PAINT WITH 100% VOLUME SOLIDS:

(NO THINNER)

1 GAL COVERS

1600 SF (149 m2) @ 1 MIL DFT

800 SF ( 74 m2) @ 2 MIL DFT

400 SF ( 37 m2) @ 4 MIL DFT


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-PAINT WITH 50% VOLUME SOLIDS

(50% THINNER)

1 GAL COVERS

800 SF (74 m2) @ 1 MIL DFT

400 SF (37 m2) @ 2 MIL DFT

PAINT GENERALLY CONSIST OF :

PIGMENT FINELY GROUND SOLIDS THAT PROVIDE THE PAINTS COVERINGS OR HIDING POWER OR ITS COLOR.

VEHICLE LIQUID MEDIUM TO CARRY THE PIGMENT IN SUSPENSION DURING APPLICATION. AND CONSISTS OF BINDERS AND SOLVENTS.

BINDER SERVE TO FORM THE PAINT FILM AND CAUSE IT TO ADHERE THE SURFACE BEING PAINTED.

BINDERS ARE LARGELY RESPONSIBLE FOR THE PROTECTIVE QUALITY AND DURABILITY OF THE PAINT FIL OR PROTECTIVE COATING.

SOLVENTS OR THINNERS ACTS DRYING AGENTS.

DEPENDING ON THE TYPE OF SOLVENT USED, A PAINT MAY DRY OR HARDEN BY OXIDATION, EVAPORATION, CHEMICAL ACTION, OR BYTHERMOSETTING ACTION AT ELEVATED TEMPERATURES.

COLOR

DEPENDS ON THE TYPE OF PAINT AND THE MANUFACTURER.

EXPOSURE

EXTERIOR OR INTERIOR

CHARACTERISTICS :

PIGMENTED COATING

LACQUER AND ENAMEL PAINTS

CLEAR COATINGS

VARNISHES, LACQUERS, SHEELAC, SEALERS

RUST INHIBITIVE COATINGS

ZINC-PIGMENTED COATINGS

ZINC, SILICONS, ALKYD, OR ASPHALT OR BASE COATINGS

ASPHALT OR TAR COATINGS THAT FORM NON-PEMEABLE BARRIERS AGAINST WATER AND OXYGEN TO PROTECT SUBMERGED FERROUS METAL ANDTO WATERPROOF MASONRY SURFACES.


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CEMENT MORTAR COATINGS

MIXTURE OF PORTLAND CEMENT, LIME AND WATER USED TO DAMPPROOF MASONRY MATERIALS AND PROTECT EXPOSED STEEL

PLASTIC AND SYNTHETIC RUBBER COATINGS

COATING RESISTANT TO MILDEW, MOLD, FUMES, MARINE ENVIRONMENTS ETC.,

PAINTS MAY BE CLASSIFIED ACCORDING TO ITS VEHICLE OR BINDER :

ALKYDS USED FOR EXTERIOR PAINTS.

OIL MODIFIED RESINS THAT HARDEN BY OXIDATION AND EVAPORATION.

THE MOST COMMON PAINT VEHICLE

FAST DRYING A HARDER THAN ORDINARY TIME, LOWERS THE GLOSS, AND IMPROVES THE PAINTS WETTING PROPERTIES, DURABILITY ANDELASTICITY TO RESIST BLISTERING.

HAVE GOOD DRYING PROPERTIES, DURABILITY AND WATER RESISTANCE FOR EXTERIOR EXPOSURES, AND GOOD COLOR RETENTION.

ASPHALT USED FOR WATERPROOFING AT FIREWALL AND ROOF DECKING.

COATINGS WITH A VEHICLE OF BOTH PETROLEUM AND NATURAL ASPHALTS ARE USED TO PROTECT WOOD, MASONRY, CONCRETE AND AS ROOFCOATING.

HAVE GOOD WATER RESISTANCES BUT THERMOPLASTIC IN NATURE.

ADDITION OF ALUMINUM GLAKES HELPS TO REFLECT THE SUNS RAYS.

ADDITION OF EPOXY RESINS MINIMIZES THE COLD FLOW AND MAXIMIZES THE CHEMICAL-RESISTANCE OF ASPHALT.

CHLORINATED RUBBER USED FOR INDUSTRIAL FLOORING.

USED IN COATINGS HIGHLY RESISTANT TO ALKALIES, ACIDS, CHEMICALS, AND WATER

MAY BE REMOVED BY COAL TAR SOLVENTS

HAS LIMITED RESISTANCE TO PROLONGED HEAT EXPOSURE

USED IN SWIMMING POOLS, WATER TREATMENT PLANTS

EPOXY CATALYZED USED FOR DUCO FINISH.

TWO COMPONENT COATINGS CONSISTING OF A PIGMENTED PRIMER OR ENAMEL AND AN ACTIVATOR OR CATALYST.

MIXED JUST PRIOR TO USE HAS LIMITED POT LIFE

PRODUCES BY CHEMICAL ACTION A DENSE, HARD FILM SIMILA

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