Road Pavement Forum May 2006 REVISION Technical Guideline: The use of Modified Bituminous Binders in Road Construction (TG 1: 2001)
Revision Process Identify issues w.r.t current specifications Review international specifications Identify other needs w.r.t guidelines
Document Structure HSE Product composition & properties Product manufacture Modified binder classification system Product requirements Selection criteria Influence on design methodologies Construction Quality assurance Protocol for introduction of new modifiers Appendix: Sampling & test methods
Document Structure HSE Product composition & properties Product manufacture Modified binder classification system Product requirements Selection criteria Influence on design methodologies Construction Quality assurance Protocol for introduction of new modifiers Appendix: Sampling & test methods
Classification System Expanded to include other modifier types (and applications) –Hydrocarbon modifiers –FT wax –Microsurfacings –Bond coats Crack sealants!
Document Structure Modified binder composition Product properties Modified binder classification system Product requirements Selection criteria Influence on design methodologies Construction Quality assurance Protocol for introduction of new modifiers HSE Appendix: Sampling & test methods
Product Requirements Collection and analysis of historical results of all modified classes “Tightening up” existing limits Adding upper (or lower) limits Adhesion criteria Addressing “Report Only” criteria
Document Structure Modified binder composition Product properties Modified binder classification system Product requirements Selection criteria Influence on design methodologies Construction Quality assurance Protocol for introduction of new modifiers HSE Appendix: Sampling & test methods
Selection Criteria Expanded significantly to incorporate: Expanded significantly to incorporate: Specific requirements for Seals incl. “winter grades” “winter grades” Specific requirements for HMA Practical constraints – climate, location, production rates etc.
Document Structure Modified binder composition Product properties Modified binder classification system Product requirements Selection criteria Influence on design methodologies Construction Quality assurance Protocol for introduction of new modifiers HSE Appendix: Sampling & test methods
Influences on Design Methodologies Surface seals – adjustment factors etc HMA – compaction temperatures, volumetrics etc. Need to align with or compliment other documents – TRH 3; IGHMA etc. other documents – TRH 3; IGHMA etc.
Document Structure Modified binder composition Product properties Modified binder classification system Product requirements Selection criteria Influence on design methodologies Construction Quality assurance Protocol for introduction of new modifiers HSE Appendix: Sampling & test methods
Construction Construction requirements & constraints Surface Seal & HMA
Document Structure Modified binder composition Product properties Modified binder classification system Product requirements Selection criteria Influence on design methodologies Construction Quality assurance Protocol for introduction of new modifiers HSE Appendix: Sampling & test methods
Quality Assurance During blending During handling & storage During construction Sampling and testing frequencies
Conclusions Initially a routine update exercise – now a major rewrite!!!!! Still on target for original deadline: May 2007