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Document Sample
Accreditation of Thin-Layer
Asphalt Mixes
W Steyn, A Visser, E Denneman
2005
Content
• Agrément SA
• Thin-Layer Asphalt mixes
• Cold mixes
2005
Agrément SA
• Fit-for-purpose certification
– Need identified
– Develop guideline
– Approve guideline
– Invite applications
– Evaluate
– Certify
– Audit
• Agrément ≠ CSIR
– Ministery of Public Works
2005
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
2005
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!
2005
Thin-Layer Asphalt mixes
• Process followed
• Current status
• Main pointers
2005
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
2005
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
2005
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
2005
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
2005
Request for certification
No Agrément Yes
Establish assessment team
approval?
T-LA: Process
Assess applicant’s information
No Yes
Reject Satisfactory? Prepare contract
Yes No
Accept?
Assess applicants
production control
Terminate
No
Reject Satisfactory?
Yes
Assess applicability of
existing test data
No Yes
Satisfactory?
Inform applicant of Assess existing test data
additional test requirements
No Accept?
Yes
Terminate
Perform required test
and assess results
No
Reject Satisfactory?
Yes
Agrément SA procedure
for certification
Notify applicant Monitor
2005
TLA: Classification
Application Number of vehicles Certificate Category A:
category per lane per day class - speed limit ≤ 60 km/h
- gradients > 6 per cent
A > 10000 1A
- intersections.
B > 10000 1B Category B:
- speed limit > 60 km/h
A 2000-10000 2A
- gradients ≤ 6 per cent
B 2000-10000 2B
A < 2000 3A
B < 2000 3B
2005
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
2005
2005
