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Accreditation of Thin-Layer Asphalt Mixes

Accreditation of Thin-Layer Asphalt Mixes. W Steyn, A Visser, E Denneman. Content. Agrément SA Thin-Layer Asphalt mixes Cold mixes. Agrément SA. Fit-for-purpose certification Need identified Develop guideline Approve guideline Invite applications Evaluate Certify Audit

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Accreditation of Thin-Layer Asphalt Mixes

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  1. Accreditation of Thin-Layer Asphalt Mixes W Steyn, A Visser, E Denneman

  2. Content • Agrément SA • Thin-Layer Asphalt mixes • Cold mixes

  3. Agrément SA • Fit-for-purpose certification • Need identified • Develop guideline • Approve guideline • Invite applications • Evaluate • Certify • Audit • Agrément ≠ CSIR • Ministery of Public Works

  4. Current roads-related Agrément SA certificates • Current guideline and certificates • Bridge deck joints • Current guideline – awaiting applicants • Non-traditional road additives (chemical stabilisers) • Almost guideline • Thin-layer asphalt • Guideline to be developed • Cold mix

  5. What is a certificate / not • Certificate – Agrément has evaluated a product and deemed it fit-for-purpose in accordance with a certain industry-approved guideline • Certificate ≠ guarantee / warrantee!

  6. Thin-Layer Asphalt mixes • Process followed • Current status • Main pointers

  7. T-LA: Process followed • Industry Task Team established • Clients and industry • Had meetings, decided on BBA guideline as model • Technical team selected to update BBA • Process followed with comments from core team and subsequent comments from ITT • Agrément TECO reviewed document and approved subject to final comments

  8. T-LA: Current status • Further comments from ITT received • Most comments addressed in documents • Some not addressed due to specific reasons – being communicated • Agrément Board meeting now for approval subject to comments • Further comments to be addressed during first evaluations – document is not ‘locked’, although final • Recommendations for issues to be researched further made to Agrément • Will be available on Agrément website • www.agrement.co.za • Please send your applications

  9. T-LA: Main pointers • BBA guideline used as model • Update for SA conditions and test methods where possible • If no SA equivalent – use BBA developed test in the interim • Mandatory and Optional tests • Mandatory – visual, texture, skid resistance, etc • Optional – noise, rut, etc • Process to be followed • Performance levels to be fine-tuned

  10. TLA: General • Evaluate existing data and sites • Request / perform additional laboratory tests where required • Evaluate field trial • Performance values • Acceptable • Indicative • Proposed • No difference between minima – mostly safety related parameters

  11. T-LA: Process

  12. TLA: Classification • Category A: • speed limit ≤ 60 km/h • gradients > 6 per cent • intersections. • Category B: • speed limit > 60 km/h • gradients ≤ 6 per cent

  13. Cold Mix Asphalt • Current situation • No guideline as yet • Possible to start with existing BBA guideline again • Need to establish ITT – RPF to nominate • Process • January / February 2006 first ITT meeting • Decide on final process • Develop guideline • Comments and approval • Implement

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