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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Performance classification framework for SA bitumen

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Performance classification framework for sa bitumen

Performance classification framework for SA bitumen

Report on progress


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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