2014.12.10 - guidelines for reviewing concrete mix designs
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mixeds concreteTRANSCRIPT
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SEAONC CONSTRUCTION QUALITY ASSURANCE COMMITTEE
Art Dell, PE SOHA Engineers
Guidelines For Reviewing Concrete Mix Designs
SE University, December 10, 2014 www.LearnWithSEU.com
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Find a a copy of the Guidelines by googling:
“Guidelines for Reviewing Concrete Mix Designs”
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CONSTRUCTION QUALITY ASSURANCE COMMITTEE
Design engineers Engineers that work at inspection and
testing agencies “…issues related to the quality of the
construction process with an emphasis on testing and inspection issues.”
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THE “GUIDELINES”
The submittal process
The review process
Where it goes from here
Appendix A Annotated Samples
Appendix B Performance and Code Considerations
Appendix C Specifications
Appendix D Review of Mix Design Strengths
Appendix E Definitions
Appendix F References
Appendix G Aggregate Report
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HANDOUTS
“ACI HANDOUT”
“GUIDELINES HANDOUT”
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CONCRETE MIX DESIGN SUBMITTAL The Review Process
Specifying Concrete
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THE CONCRETE SUPPLIER
THE STRUCTURAL ENGINEER
THE TESTING AND INSPECTION AGENCY
CONCRETE MIX DESIGNS
WHO PREPARES THEM?
WHO REVIEWS THEM?
A REGISTERED ENGINEER?
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PROPORTIONING CONCRETE MIXES
THE CONCRETE SUPPLIER WILL USE: Experience Knowledge of the materials Knowledge of the project requirements ACI 211.1:
Standard Practice for Selecting Proportions for Normal, Heavyweight and Mass Concrete
Estimated Weight Method Absolute Volume Method
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CONCRETE MIX DESIGNS –
SPECIFICATION APPROACH
PRESCRIPTIVE SPECIFICATION: Compressive Strength Aggregate Source and Gradation Quantity of Cement per Cubic Yard Maximum Water/Cement Ratio Slump
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CONCRETE MIX DESIGNS –
SPECIFICATION APPROACH
PERFORMANCE SPECIFICATION: Compressive Strength Durability - Exposure Class Nominal Maximum Aggregate Size Shrinkage Limitations
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PERFORMANCE SPECIFICATION
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PERFORMANCE SPECIFICATION
EXPOSURE CATEGORIES
F2 MODERATE FREEZING AND THAWING
S0 SULFATE EXPOSURE NOT APPLICABLE
P1 LOW PERMEABILITY REQUIRED
C3 MODERATE CHLORIDE EXPOSURE
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CONCRETE MIX DESIGNS –
SPECIFICATION APPROACH
NATIONAL READY-MIXED CONCRETE ASSOCIATION -
“P2P INITIATIVE”
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PERFORMANCE SPECIFICATION
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WATER
CEMENT
SUPPLEMENTAL CEMENTITIOUS MATERIALS FLY ASH GROUND GRANULATED BLAST FURNACE SLAG SILICA FUME METAKAOLIN
w/c = Ratio of the mass of water to the mass of portland cement w/cm = Ratio of the mass of water to the mass of cement plus the supplemental cementitious materials (SCM)
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LOW W/CM RATIO = NO CRACKS?
HIGH CEMENT CONTENT = MORE CRACKS?
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Submittals help us verify that the contractor is interpreting the construction documents correctly… Construction documents include the drawings and specifications…
So… Get out the plans and specs
And…
ACI 318 and your books of ASTM Standards 16
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THE SPECIFICATIONS GOVERN THE SUBMITTALS
Division 1 - Section 01 3X 00 “Submittals” Administrative Requirements:
Review Time Types of Submittals: Product Data Certifications Test Results
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CONCRETE SPECIFICATIONS
Section 03 30 00 – Cast-in-Place Concrete Section 03 05 15 – Portland Cement Concrete Part 1 General Part 2 Products Part 3 Execution
Submittals Quality Assurance
Concrete Materials Concrete Mixes
Placement, finishing, etc
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DRAWINGS MAY ALSO HAVE NEEDED INFORMATION Concrete strength requirements
Concrete “Class” identification
What concrete mix goes where
CHECK THE GENERAL NOTES
CHECK THE STEEL DECK SCHEDULE
Class 3500-3/4
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The Mix Design Submittal - Is it Complete and Responsive?
Is it for you? Has the Contractor reviewed and stamped it? Are all the items requested included? Does it include all mixes? Does it indicate where each mix is to be used?
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Do not hesitate to: Return it un-reviewed if it is obviously incomplete or unresponsive Contact the Architect to discuss missing information Ask for permission to contact the contractor or supplier
directly for clarifications. Only review items that are your responsibility MSDS?
LEED? 21
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THREE QUESTIONS Does the mix meet the performance requirements of the specifications with respect to strength and other characteristics such as shrinkage, permeability, w/cm ratio, etc? Is the historical or trial batch test data adequate to justify the strength? Do the materials used comply with the project requirements as evidenced by test results, certifications, and product data?
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27.001 Cubic Feet
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6-sack, 4000 psi
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“Saturated Surface Dry”
ASTM C 150 Cement Types: Type I – least restrictive Type II – moderate sulfate resistance Type III – high early strength Type IV – low heat of hydration Type V – high sulfate resistance
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Relative percentages of coarse and fine aggregates
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Dosage rate shown in manufacturer’s recommendations is generally given in ounces per
“hundredweight” of cementitious materials
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FRESH UNIT WEIGHT 122.39
AIR 6.0%
EQUILIBRIUM UNIT WEIGHT CAN BE CALCULATED USING ASTM C 567 30
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ASTM C330 – Lightweight Aggregates
Splitting Tensile Strength 310 psi Min
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QUALIFYING A MIX ON THE BASIS OF
STRENGTH
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The Required Average Strength – f’cr is the key concept here
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QUALIFYING A MIX ON THE BASIS OF
STRENGTH
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The Required Average Strength is always greater than the
specified strength
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THE REQUIRED AVERAGE STRENGTH CONCEPT
IS BASED ON:
• Limiting the probability to no more than 1-in-100 that: – The average of any three consecutive
strength tests taken during construction will be below the specified strength;
– AND – Any single strength test will be more than
500 psi below the specified strength. 34
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DETERMINING REQUIRED AVERAGE STRENGTH
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DETERMINING REQUIRED AVERAGE STRENGTH
USING TABLE 5.3.2.2
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DETERMINING REQUIRED AVERAGE STRENGTH
USING A FIELD STRENGTH RECORD
STEP 1 – CALCULATE STANDARD DEVIATION
VARIABILITY OF STRENGTH TESTS RELATED TO:
UNIFORMITY OF MIX PLANT QUALITY CONTROL
STEP 2 – CALCULATE REQUIRED AVERAGE USING TABLE 5.3.1.2
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DETERMINING REQUIRED AVERAGE STRENGTH
USING A FIELD STRENGTH RECORD
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DETERMINING REQUIRED AVERAGE STRENGTH
USING A FIELD STRENGTH RECORD
5.3.1.1 (continued)
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The modification factor for a 15-test record is 1.16 – see Table 5.3.1.2
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CALCULATING REQUIRED AVERAGE STRENGTH
f’cr = 4540 psi
versus 4000 + 1200 = 5200 psi
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5.3.3 - Documentation of Average Compressive Strength - Summary
Data from actual proposed mix not required Similar mix OK – just like for f’cr As few as 10 tests are acceptable
Must be consecutive tests Must be from a minimum 45-day period
Often the same test record is used
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5.3.3.2 - Documentation of Average Compressive Strength by Trial Mixtures
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5.3.3.2 - Documentation of Average Compressive Strength by Trial Mixtures
Commentary (b) For concrete made with more than one type of
cementitious material, the concrete supplier must establish not only the water-cementitious material ratio but also the relative proportions of cementitious materials and admixtures, if any, that will produce the required average compressive strength and satisfy the durability requirements of Chapter 4. This will require multiple trial batches with different mixture proportions. The exact number of batches will depend on the number of cementitious materials and the range of their relative proportions.
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Com
pres
sive
Stre
ngth
W/CM Ratio
f’cr = 4000 + 1200 = 5200 psi
5200 psi line
Yields 0.52 W/CM
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“conforms to…ASTM specification C33”
No signature…
C 33 Requires: Clay and Friables Lt. Wt. Particles Abrasion Loss Soundness
Alkali-Silica Reactivity:
ASTM C 295 ASTM C 289
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2.3 to 3.1
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C 33 Requires: Sieve analysis Organic Impurities Mat’l < #200 sieve
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…meets or exceeds…ASTM C 150, Type I, II, IV…, Low-alkali; ASTM C 1157, Type GU
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…meets… ASTM C 618 for Class F fly ash
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Other Submittal Items Admixture Product Data or Certification Slag Cement Certification Shrinkage Test Reports Permeability Test Report Total Chloride Calculations or Test Results Thermal Control Plan
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Sustainability LEED Local Materials (cement, aggregates, fly ash) Recycled Materials (fly ash, slag cement, recycled concrete aggregates) Slag Cement or White Cements to lighten the color can reduce interior lighting requirements and mitigate the heat island effect
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Sustainability INTERNATIONAL GREEN CONSTRUCTION CODE
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QUESTIONS?
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SEAONC CONSTRUCTION QUALITY ASSURANCE COMMITTEE
Art Dell, PE SOHA Engineers
Guidelines For Reviewing Concrete Mix Designs
SE University, December 10, 2014 www.LearnWithSEU.com
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CHALLENGE QUESTION:
Which Appendix from the Guideline is the answer to this session’s Challenge Question?
A. Appendix A Annotated Samples B. Appendix B Performance and Code Considerations C. Appendix C Specifications D. Appendix D Review of Mix Design Strengths
Please circle the answer that is announced so that you can use the information to complete your quiz (NY) or form (FL) for PDH.