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Performance-based Specifications for Concrete

Performance-based Specifications for Concrete. A focus on innovation, quality, and customer satisfaction. What is the P2P Initiative?. Prescription-to-Performance An alternative to current prescriptive specifications An initiative of the concrete industry Spearheaded by the NRMCA. P2P GOALS.

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Performance-based Specifications for Concrete

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  1. Performance-based Specifications for Concrete A focus on innovation, quality, and customer satisfaction

  2. What is the P2P Initiative? • Prescription-to-Performance • An alternative to current prescriptive specifications • An initiative of the concrete industry • Spearheaded by the NRMCA

  3. P2P GOALS • Allow performance specifications as an alternative to current prescriptive specifications • Leverage expertise of all parties to improve quality and reliability of concrete construction • Assist architects/engineers to address concrete specifications in terms of functional requirements • Allow flexibility on the details of concrete mixtures and construction means and methods • Better establish roles and responsibilities based on expertise • Elevate the performance level and quality of ready mixed concrete • Foster innovation and advance new technology at a faster pace

  4. What is a prescriptive Specification? • Do not always cover intended performance • May conflict with intended performance • Limits competitive bidding • No incentive for quality control • Not in the owner’s best interest

  5. Prescriptive Specification Intended Performance • Placing/Finishing • Strength • Max Shrinkage • Resistance To: • Freeze-Thaw • Deicer scaling • Corrosion • Sulfate attack • ASR • Cracking • Abrasion Typical Criteria • Slump • Max w/cm ratio • Min cement content • Min/max air • Min/Max pozzolans/slag • Blended cements • Aggregate grading • Source Limitations • Chloride Limits

  6. Water-cement Ratio Air Air Water Water Paste Cement Cement

  7. Does w/c alone control strength?

  8. Does w/c alone control permeability?

  9. What is a Performance Specification? • Focus on performance and function • Flexibility to adjust mixture ingredients and proportions to achieve consistent performance • Measurable and enforceable

  10. Benefits to the Owner • Improved quality • Improved performance • Reduced construction time • Reduced cost • Higher confidence in concrete construction

  11. Benefits to the Engineer/Architect • Focus on function rather than composition • Strength, Durability, Shrinkage, etc. • Simplified submittal review • Improved product consistency • Reduced conflict with contractor/producer • Reduced risk – contractor and producer are responsible for performance

  12. Benefits to the Contractor • Improved communication/coordination • Constructability requirements addressed • Predictable performance • Innovate on construction means and methods

  13. Benefits to the Producer • Eliminates conflicts and improves clarity in specifications • Encourages innovation and rewards investment in quality control • Allows optimization of mixtures for performance • Allows adjustment of materials/proportions to compensate for material or ambient conditions variations

  14. Learn More and Earn Professional Development Hours by Taking an Online Seminar from NRMCA Visit www.nrmca.org/P2P

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