csa material selection criteria

ConSpec Associates, Inc.

Materials Selection Criteria

Forced Ranking

Flashcards for Engineers

CSA Material Selection Criteria ©’93

OBJECTIVE DEFENDABLE SPECIFICATIONS

Purpose: In-Depth method of proper material selection based upon individual project needs and

anticipated material performance.



Scope: Analyze, set order of priority for material properties needed, evaluate materials based on those properties,

and specify materials in order of “anticipated” performance.



System

Three sets of evaluation cards plus worksheet & instructions


• OBJECTIVE (White) – These properties re those that are quantifiable by ASTM, AASHTO, or other recognized test procedure

• SUBJECTIVE (Canary) – Properties or Attributes not easily quantified, heavily dependant upon individual preference

• PROCEDURAL (Green) – Field accountability of all aspects of repair from pre-bid site visit to final punch list.




OVERVIEW – Repair projects have for some time been reviewed, evaluated, and specified based

upon “New Construction” criteria. In many cases, these criteria are not only inappropriate

but also counterproductive to the repair process. A new thought process must be undertaken if

the repair is to be a success.


• Select Objective cards based upon the material properties/needs of the project.

• Place them in order of priority/need for the condition under consideration.

• Insert the resultant list (in order) in the column “PROPERTY” on theselection table.

INSTRUCTIONS OBJECTIVE PROPERTIES


INSTRUCTIONS

– List the 3, 4 or more manufacturers being considered under “MFGR”.

– Determine each manufacture’s number (psi, inches/inch, etc.) for each property and assign a rating from 4 (BEST) to 1 (WORST). Inserting in appropriate manufacturer’s R (Rating) column for each property. (NOTE: Best is not always the highest number for a given property, i.e., the lower the shrinkage the better.)


INSTRUCTIONS- Multiply the W (Weight) by the R (Rating) to

get the T (Totals) for each property and sum the results to get a weighted total.

(NOTE: Do not be limited by the property cards included in the CSA deck, or by the total of ten lines on the Product Selection Table. Other properties such as ELONGATION, VISCOSITY, etc., may be applicable for the particular product you are analyzing, such as urethane, epoxy or other repair material. The CSA Material Selection Criteria should be a solid base but not “Carved-In-Stone” depending on your particular needs.)


• Analyze the products to see if any do not meet a specified “minimum” or “maximum” criteria you may have for a particular property. Eliminate the product if this is the case.

• List the products in your specification in order of performance, not in alphabetical or order of familiarity.

INSTRUCTIONS


OBJECTIVE PROPERTIES

BOND

STRENGTH

(psi)

FLEXURAL

STRENGTH

(psi)

COMPRESSIVE

STRENGTH

(psi)

SPLITTING

TENSILE

STRENGTH

(psi)



SHRINKAGE

(inch/inch)

RAPID

CHLORIDE

PERMEABILITY

(Coulombs)

MODULUS OF

ELASTICITY IN

COMPRESSION

(psi)

LINEAR COEF.

OF THERMAL

EXPANSION

(inch/inch/deg.f)



ABRASION

RESISTANCE

H22 WHEEL

(% loss)

WATER

ABSORPTION

(%)

WATER VAPOR

TRANSMISSION

(US Perms)

CHLORIDE ION

PENETRATION

(% water absorption

reduction)



POTLIFE

(minutes)


SUBJECTIVE PROPERTIES

USER FRIENDLY

FAMILIARITY PAST

PERFORMANCE

TRACK RECORD

COST MFGR'S

REPUTATION

TECHNICAL

SUPPORT SINGLE

SOURCE

RESPONSIBILITY

LOCAL

AVAILABILITY

DEPTH OF

PRODUCT LINE

RANGE OF ARCH

COATINGS, COLORS & TEXTURES


PROCEDURALSITE VISITS

ARCHITECT

ENGINEER

PUNCHLIST

SIGN-OFF

PRE-BID

VISIT - MEETING

PRE-

CONSTRUCTION

MEETING

FIELD

MOCKUP

SITE VISITS

MANUFACTURER

INSTALLER

CERTIFICATION

CONTROLLED

INSPECTION


CSA MATERIAL SELECTION CRITERIA

PRODUCT SELECTION TABLE

MFGR 1 PRODUCT

MFGR 2 PRODUCT

MFGR 3 PRODUCT

MFGR 4 PRODUCT


Please note: Shrinkage compensated does not mean 0% shrinkage. Actual shrinkage should be reported in inches/inch or percentage(%). Also 0% expansion does not mean a material has no shrinkage and again should be reported as inches/inch

or percentage(%). When wet and dry shrinkage values are given, dry shrinkage is a more stringent test and closer to field conditions. All comparative test results must be from the same

ASTM/AASHTO test method.

If no values are available or Max/Min are exceeded T=0 (ie W x R therefore = 0 )

W = Weight R =Rating (1-4) T = Total (W x R)

CSA Preliminary Material Review for 9 Products ©’93

Bonsal Conproco Euclid Five Star Degussa Degussa Sika Silpro Sto# of Mfgrs providing Same Tests

V.O. Repair Conpro Set Verticoat St Conc V/O HBA HB2 123 Plus VO Patch OhMor 702Agency Standard Property a b c d e f g h i ASTM C39 Comp Str 4000 5000 2 of 9ASTM C39 Coef of TE 4.8 x 10-6 4.5 x 10-6 2 of 9ASTM C109 Comp Str 5000 6525 6500 5000 5000 5800 7000 6300 8 of 9ASTM C157 Len Change 500 0.04% 350 350 0.19% 0.10% 6 of 9ASTM C191 Set Time 14 - 20 25 - 40 15 - 30 180 - 240 20 - 30 5 of 9ASTM C293 Flex Str 2000 1500 2 of 9ASTM C307 Tensile 680 1 of 9ASTM C348 Flexural 930 1500 750 1000 1180 5 of 9ASTM C469 M of E 2.7 x 10-6 1.9 x 10-6 2.0 x 10-6 2.26 x 10-6 4 of 9ASTM C496 Split Ten 660 360 500 900 565 5 of 9ASTM C531 Coef of Exp 5.0 x 10-6 1 of 9ASTM C666 Freeze Thaw >80% 96 100 98 99 5 of 9ASTM C672 Res F/T 50 cyc - 0 1 of 9ASTM C882* Bond Strength 2200 1250 2400 2200 1650 5 of 9ASTM C928 Comp Str 6500 1 of 9ASTM C932 Ten Bond 400 1 of 9ASTM C1042 Sl-Sh Bond 1605 1760 670 941 4 of 9ASTM C1202 Coulombs <1000 1 of 9ASTM D2240 Durometer 80-85% 1 of 9ASTM D4541 Dir Ten Bond 500 1 of 9AASHTO T-277 Coulombs 500 1 of 9 Tests Available 2 10 5 5 11 11 6 6 6


PROPERTY METHOD MAX MINMFG

BW R T MFG E W R T

MFG F

W R TMFG

HW R T

C-157 SHRINKAGE 50010 350

10 350

10 ---

10

C-882 BOND --- 9 1250 9 2400 9 1650 9

C-496 SPLIT TEN 660 8 360 8 500 8 --- 8

C-109 COMP 5000 7 5000 7 5800 7 6500 7

C-666 F/T --- 6 96 6 100 6 99 6

C-348 FLEX 930 5 750 5 1000 5 1180 5

B 4 E 4 F 4 H 4

B 3 E 3 F 3 H 3

B 2 E 2 F 2 H 2

B 1 E 1 F 1 H 1


PROPERTY METHODMFG

BW R T

MFG E

W R T MFG F W R TMFG

HW R T

C-157 SHRINKAGE 500 10 3 350 10 4 350 10 4 --- 10

C-882 BOND --- 9 1250 9 2 2400 9

4 1650 9 3

C-496 SPLIT TEN 660 8 4 360 8

2 500 8

3 --- 8

C-109 COMP 5000 7 2 5000 7 2 5800 7 3 6500 7 4

C-666 F/T --- 6 96 6 2 100 6

4 99 6

3

C-348 FLEX 930 5 2 750 5

1 1000 5

3 1180 5

4

4 4 4 4

3 3 3 3

2 2 2 2

1 1 1 1


PROPERTY METHODMFG

BW R T

MFG E

W R TMFG

FW R T

MFG H

W R T

C-157 SHRINKAGE 50010

3 30 350

10

4 40 350

10 4 40 ---

10

0 0

C-882 BOND --- 9 0 0 1250 9

2 18 2400 9

4 36 1650 9 3 27

C-496 SPLIT TEN 660 8 4 32 360 8

2 16 500 8 3 24 --- 8

0 0

C-109 COMP 5000 7 3 21 5000 7 3 21 5800 7 4 28 --- 7 0 0

C-666 F/T --- 6 96 6 2 12 100 6

4 24 99 6

3 18

C-348 FLEX 930 5 2 10 750 5

1 5 1000 5

3 15 1180 5

4 20

93 112 167 65


OBJECTIVE DEFENDABLE SPECIFICATIONS When can/should it be used?

1 - Select Materials For Specific ProjectCards require both tactile response and

thought process by the specifier to determine best properties for application

under consideration



2 - Evaluate Substitute Materials After Award

CSA MSC allows contractor to submit substitute material for evaluation after

project award with objective review based upon second forced ranking



3 - Provide Traceability of Selection in Case of Litigation

Should a review of the material selection ever come into question, say in the case of

a “repair of the repair”, the specifier can provide an “objective” review of his

selection process.


OTHER APPLICATIONS

Selection Process is good for any class/set/group of materials that have

quantifiable test results based on a recognized set of standards.

THANK YOU


PROPERTY METHOD MAX. MINMFG

1W R T

MFG 2

W R TMFG

3W R T

MFG 4

W R T

10

10

10

10

9 9 9 9

8 8 8 8

7 7 7 7

6 6 6 6

5 5 5 5

4 4 4 4

3 3 3 3

2 2 2 2

1 1 1 1

csa material selection criteria

Documents

csamaterial selection

repair material

csa deck

objective cards

objective white

product mfgr

repair process

particular property