paperworks in acdc - pcpi.docx
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REPUBLIC OF THE PHILIPPINES
POLYTECHNIC UNIVERSITY OF THE PHILIPPINES
TAGUIG CAMPUS
General Santos Avenue, Lower Bicutan, Taguig City
In partial fulfillment of the requirements in
ECEN 2014 (AC/DC Machineries)
Submitted by:
CAPONES, Clariza B.
CARILO, Jonathan
FRAGO, Christopher
HERNANDEZ, Julius A.
LABRADOR, Reymart E.
Submitted to:
Engr. Reginald Raquiza
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History of Ready-Mix Concrete
The term ready mix concrete refers to a type of concrete that is manufactured in
a batching plant or factory according to a specific formula and is then delivered to a
work site by truck-mounted transit mixers. Although the first load of ready mix concrete
was delivered to a building site in Baltimore, Maryland, in 1913, the early ready mix
plants appeared in the 1930s when the standard of practice was for contractors to mix
concrete at the work site from bagged cement and aggregates delivered separately.
The ready mix concrete industry expanded significantly in the 1960s. Modern ready mix
concrete is made under computer-controlled conditions. This results in specialty
mixtures designed for very specific purposes. The use of ready mix concrete allows a
precise recipe to be delivered to the work site. This eliminates the need for an on-site
concrete mixing plant and the need for storage space for the materials to make concrete
at the site. Ultimately, the use of ready mix concrete reduces noise and labor costs and
can improve air quality at the work site.
The concrete is delivered freshly mixed and in a plastic state from a centrally
located batching plant that can serve a wide area. This is an advantage as the plant can
be located, for instance, in an industrially zoned area and make deliveries to residential
districts or into congested city work sites. However, when the materials are combined at
a batch plant, the mixing begins at the plant so travel time from the plant to the work site
is critical. Batch plants cannot be too far away from the site. The concrete should be
placed within ninety minutes of being mixed. The weight of concrete is 1,776 kg/cubic
meter (3,915 lbs/cubic yard) for general purpose concrete, and means that the transit
mix truck is 33 tons for a normal 7.6-cubic-meter (10-cubic-yard) load. Therefore,
concrete manufacturers strive to keep transportation distances to a minimum to avoid
hauling heavy loads great distances.
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History of Pacific Concrete Products, Inc.
Founded in the year 1950s, Pacific Concrrete Products, Inc.s first product to
manufacture was hollow blocks made from granolithic materials. Then not for long, they
later introduce concrete hollow blocks. After three decades of producing quality
concrete products wherein they have achieved not only acceptance but leadership in
the field of cement tile, granolithic and concrete pipe manufacturing, the company
embarked on the production of Ready Mix Concrete in the year 1989.
At its onset, all the big subdivisions being developed near the Ready Mix Plant site in
Brgy. Malhacan, Meycauayan, Bulacan were supplied by their company. There was the
Metrogate Subdivision in Brgy. Malhacan, Meycauayan; the Philiville Subdivision Phase
I, II, II, & IV in Brgy. Sto. Nino, Meycauayan; the Moldex Subdivision in Marilao,
Bulacan. Other subdivisions being supplied by PCPI were the Palmera Development in
Fairview, Quezon City, Active Realty Subdivision in Marilao, Bulacan. Among the other
projects undertaken by our Ready Mix Company was the Navotas Fishpoint expansion
project; the PLDT expansion project in Malolos, Bulacan being undertaken by the
Electronic Telephone Systems, Inc. (ETSI); the PLDT expansion program in Binondo,
Novaliches and Commonwealth Avenue also being undertaken by ETSI.
Due to their consistency and track record in asphalting roads, PCPI has been given the
AAA (Triple A) rating of the Philippine Contractors Association Board, the highest
rating given, and is qualified by the government to undertake the biggest and largest
Road Projects.
The MERALCO transmission line expansion project from Valenzuela to Meycauayan to
Bocaue, the Manila Hotel Veranda expansion projects, the PLDT shipyard and drydock
in Navotas and several other Road Project in Malabon, Navotas, Valenzuela,Meycauayan and Malinta, Bulacan.
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Products
Asphalt
Pacific Asphalt and Concrete Mix offer a wide range of cost effective, high performance
asphalt products that can be used on major highway systems, driveways, parking areas,
or rural country roads. Designed for consistency and reliability, our asphalt
products can be tailored to cater for different weight loads, traffic volumes, and weather
conditions.
http://www.cemex.co.uk/asphalt.aspxhttp://www.cemex.co.uk/asphalt.aspx -
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Ready-mix Concrete
Concrete is the second most consumed product in the world after water! As market
leaders in concrete production, Pacific Asphalt and Concrete offer a wide range of
products and solutions.
http://www.cemex.co.uk/concrete.aspxhttp://www.cemex.co.uk/concrete.aspx -
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Aggregates
Aggregates are composed of geological materials such as stone, sand, and gravel and
are used in virtually all forms of construction. They can be used in their natural state or
can be crushed into smaller pieces.
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Concrete Pipes
From our extensive range of products, our clients can avail an utmost quality
assortment of Concrete Pipes. They can avail the range in various sizes and lengths to
meet their application requirements. Further, for the fabrication purpose of the range,
we have used the best quality raw material that is procured from most trusted vendors
of the industry.
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Hollow Blocks
Concrete Hollow Blocks are a new innovative technology in the building infrastructure.
These concrete hollow blocks are a better substitute to work faster and faster to build a
structure long lasting value.
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Company Profile
Vision Statement
To be the Top Construction Materials and Construction Company in the eyes of our
customers, shareholders, and in the communities we do conduct our business.
Mission Statement
To become the best company in the country producing products and services of the
highest engineering and product standards at the best value and provide the best
returns on the investment of our shareholders investors as well as the best value of our
stakeholders and partners.
Quality Policy
The company (PCPI) its managers, supervisors, and all its employees through the
Quality Managements Committee are committed to the quality of our products and
services and our stated quality goals towards Customer Satisfaction.
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List of officers
Engr. Eresto Vergara
Construction Superintendent
Engr. Cesar Reyes
Contract Manager
Eureka Ycasiano
Chief Accountant
Engr. Ramir Vinzon
Plant Manager (Asphalt)
Engr. Lorenzo Lim
Plant Manager (Concrete)
Engr. Norberto Isleta
Plant Manager (Concrete)
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Location
Pacific Concrete Products, inc. (Asphalt)
Malhacan, Meycauayan, Bulacan
Pacific Concrete Products, inc. (Concrete)
Km. 19 East service Rd. Malhacan, Meycauayan, Bulacan
Pacific Concrete Products, inc.
Km. 17 East Service Road South Super Highway, Paranaque
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Ready Mix Concrete Process
Storage of Materials
Compartment
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Aggregates
The raw materials, coarse and fine aggregates are placed in the compartment. These
materials are being fed manually to the ground hopper.
After the materials were fed to the ground hopper, these aggregates will be weighed by
the aggregate weighing bin. Air cylinders will open the bin and the aggregates will come
out to the horizontal conveyor which in turn will convey the weighed coarse and fine
aggregates to inclined Conveyor. The inclined conveyor bin will then convey the
weighed coarse and fine aggregates to the aggregate transfer bin. The purpose of this
aggregate transfer bin is for storage on top of the mixer.
Cement
Cement is generally stored in silos. The loading of cement is done with the help of
pneumatic blower systems either installed on bulk carriers or a separate system
available at the plant. If baggage cement is used then the cement is loaded using a
compressed air loader and a splitter unit.
Cement is weighed separately, and is transported from the silo into a mechanical
or electromechanical weigher by means of a screw conveyor.
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Water
Wateris generally stored in tanks located close to the plant. It is accurately measured
by a water gauge and microprocessor controlled system. The plants have recorders that
measure the moisture present in sand while the entire batch flows past. A recording unit
calculates the average moisture value of the sand and passes on the information to
the batching control unit to allow corrective action to be taken.
Consistency of the mix is checked by a remote recording system. If concrete is very dry
(stiff) the electrical resistance of the batch is measured and if the concrete is wet themotor output is measured. Accurate maintenance of the workability (consistency) of
one cubic meter batch of concrete may depend on as little as one litre or less of water .It
is scarcely conceivable that such a production process could be controlled without
actually measuring the workability and later correcting the consistency.
Mixing Arrangement
The power mixer sets in motion the materials positively. The materials get thoroughly
mixed by rotating arms. These mixers have shortermixing time, give
betterhomogeneity, consistency and strength to the concrete.
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Control Systems
Almost all imported production plants offer automatic systems for control functions. hese control
are operated from main desk. It also has material availability monitor and printer plus an additio
batching monitor. The entire plant can be operated by just one person.Microprocessor control
besides having fully automatic running facility offers number of additionalfeatures like statistical
data recording and processing, a printer unit, moisture adjustmentarrangement, customer
address, memory etc.All you need to do is push the required mix template into the slot and pres
the "start" buttonand the control system does the rest. Aggregate and cement weighment,
moisture correction, overruncorrection and additive weighment are done accurately to give the
concrete mix of desired strengthand workability.The built in trouble shooting programmes are m
valuable and have a high reliability factor.Even upto 1500 mixes of different types can be stored
along with names and addresses of theconsumer and other data which is required to be stored
the computer for operation of the plant.The mix data with quantity can
be if required printed by the printer which is very useful for invoicing the consumer for the
concrete supplied to them.