performance classification framework for sa bitumen
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Performance classification framework for SA bitumen. Report on progress. Specification framework. Current system provides for production grades Selection of grade – largely empirical Globally selection of binder based on: Climate Traffic volumes Loading rate

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specification framework
Specification framework
  • Current system provides for production grades
  • Selection of grade – largely empirical
  • Globally selection of binder based on:
    • Climate
    • Traffic volumes
    • Loading rate
  • Past 15 years – significant developments in specifying binder properties
scope of bit spec working group
Scope of bit spec working group
  • Primarily to examine the feasibility of the implementation of a performance grading system
  • The need to differentiate between asphalt and seals
  • Inclusion of modified binders too ambitious
  • Predominantly review of current experience and literature studies
  • New test procedures – only if appropriate
  • Time frame for implementation 3 – 5 years
rules of the game
Rules of the game
  • No proliferation of binder grades (in terms of the scale of SA industry)
  • CAPSA paper of vd Ven et al provides the basis of a framework
  • Finger printing of current SA bitumen using
    • SHRP procedures
    • Methods developed at UW-M
  • Develop a longer term ageing protocol for SA bitumen
way ahead
Way ahead
  • Full range of binders from all SA refineries tested under SHRP and UW-M methods
  • Analysis of test results and recommendations will be reported to the RPF task group
  • Validation of “representivity” through further tests
  • Implementation
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