Accreditation of Thin-Layer Asphalt Mixes

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Accreditation of Thin-Layer Asphalt Mixes

• W Steyn, A Visser, E Denneman

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Content

• Agrément SA
• Thin-Layer Asphalt mixes
• Cold mixes

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Agrément SA

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

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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

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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!

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Thin-Layer Asphalt mixes

• Process followed
• Current status
• Main pointers

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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

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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

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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

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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

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T-LA Process
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TLA Classification

• Category A
• speed limit 60 km/h
• gradients gt 6 per cent
• intersections.
• Category B
• speed limit gt 60 km/h
• gradients 6 per cent

Application category Number of vehicles per lane per day Certificate class
A gt 10000 1A
B gt 10000 1B
A 2000-10000 2A
B 2000-10000 2B
A lt 2000 3A
B lt 2000 3B
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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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