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Development and Accreditation of Thin-Layer Asphalt Mixes in South Africa

This document outlines the process for the accreditation of Thin-Layer Asphalt (T-LA) mixes in South Africa, including the establishment of industry standards and guidelines. The focus is on using the BBA guideline as a model to develop fit-for-purpose certification for products, ensuring compliance with safety and performance standards. It details the steps involved from evaluation to approval, the role of Agrément SA and the Ministry of Public Works, and the need for additional laboratory testing as part of the certification process.

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Development and Accreditation of Thin-Layer Asphalt Mixes in South Africa

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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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