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Published byBasil Pearson Modified over 9 years ago
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Task group on bitumen specifications Report back May 2005
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Working groups Interim review of current specification Quality management during road haul Sampling Introduction of performance based specifications
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Review of current specification Convenor – Denzil Sadler Fine tuning following more than a decade of experience Promote equitable procurement Proposed amendments: –Mass change after RTFOT (%max) – 0.3 –Increase in R&B SP after RTFOT (ºC max) – 7 –Viscosity at 60ºC for 60/70 pg bitumen (min Pa S) – 140 Need to assess long term ageing
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Review/cont... Caveat on modification: “Compliance of bitumen with this specification does not guarantee compatibility with various modifiers. Consequently the onus rests with the manufacturer of modified binders to ensure compatibility through testing.”
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Quality management during road hauling Extended terms of reference Draft document – Code of practice for hauling bitumen and liquid bituminous products commissioned by Sabita Extending the quality chain and audit trail to point of off-loading Role of transporters still to be clarified
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Proposals to RPF Acceptance of amendments to current specifications Acceptance in principle of caveat on modifier compatibility
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Performance based specifications Kim Jenkins
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