Advancing Performance-Based Concrete Specifications: P2P Update

1. P2P Update January 17, 2007

2. P2P Update • Promote performance based specifications as the preferred alternative to prescriptive specifications through • Partnering • Industry Credibility • Codes and Standards • Technology • Case Studies • Education

3. Goal 1: Partnering – Progress • Advisory group of engineers and architects • Advisory group of contractors (ASCC) • 100+ presentations/seminars on P2P Initiative • ACI local chapters • State RMC Associations • State SEA and ASCE chapters • National Conventions (ACI, ASCE, NCSEA, AIA, CSI, AASHTO) • Guidance on concrete specifications • Communicate progress via newsletters, web site, and industry publications

4. Goal 2: Credibility – Progress • Quality management system • Guidelines have been developed • Based on ISO 9000 concept • Producer certification program • Pre-qualify producers for performance-based projects • Based on quality management system • Under development • Concrete professional certification through ACI • Develop and approve performance mix designs • Guidelines and training program • Under development

5. Goal 3: Codes and Standards – Progress • Model (guide) performance specification • Example performance-based specification developed • Developing model specification – ongoing Bickley, Hooton, Hover research project – May 2007 • ACI Strategic Development Council ATI #44 • Proposed ACI-ITG to develop guide specification • Code change proposals • ACI 318 Chapter 4 alternative to w/c ratio (RCPT) rejected for 2008 – will try again in 2011 • ACI 318 Chapter 4 exposure class concept approved for 2008 • ASTM C 94 performance/prescriptive option still under discussion

6. Example Performance Specification • Uses a building example • Concrete with • No exposure • Freeze-thaw exposure • Sulfate exposure • Objective • Minimize prescriptive requirements • Meet current ACI 318 code requirements

7. Preparation of a Performance-based Specification for Cast-in-Place Concrete • Conducted by Bickley, Hooton, and Hover • Phase I was completed in January 2006 • Comprehensive review of performance specs and tests from around the world • Phase II will include a standard spec in ACI 301 format • Scheduled for completion in May 2007

8. Goal 4: Technology – Progress • Research project to develop durability test for qualification and acceptance • Alternative to w/c requirement in ACI 318 • Correlate index tests (RCPT, RMT, and Sorptivity) to science based tests such as diffusion measurements • Funded by NRMCA, RMC Research Foundation, PCA • Co-funded by FHWA pool-fund study to correlate laboratory measurements with field results • Estimated at $1.5 Million over 4 years

9. Goal 5: Case Studies – Progress • Compared results of several tests on lab samples • Prescription vs performance specs for: • Slab on Grade • Bridge Deck • Structural Concrete (ACI 318) • In all cases performance criteria gave better results

10. Goal 6: Education – Progress

11. Introduction to P2P • Presentation • Brochure • Basic overview of the P2P Initiative • Encourages people to take the online seminar

12. ASCE Seminar • Two-day seminar • Structures subject to extreme conditions • Freeze-thaw • Chemical attack • Corrosion • Provide design details • Develop performance-based specifications • Latest quality assurance methods

13. P2P Articles • Approximately 20 articles published • Structure magazine • Concrete International • Structural Engineer • Other articles and downloads are available at www.nrmca.org/P2P

14. 2007 Concrete Technology Forum • High Performance Concrete • May 22-24, 2007 • Fairmont Dallas Hotel • Topics include: • Self Consolidating Concrete • Ultra Fast Track Construction • Extended Service Life • Industrial Concrete Floors • Applications and Case Studies • Performance Specifications and Testing

15. Questions?