2005

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

T-LA: Process

Terminate

Request for certification

Agrément approval?

Notify applicant

NoEstablish assessment team

Yes

Assess applicant’s information

Satisfactory?No Yes

Prepare contract

Accept? No

Assess applicants production control

Yes

Satisfactory?No

Reject

Assess applicability of existing test data

Yes

Satisfactory?

Inform applicant of additional test requirements

No

Assess existing test data

Yes

Accept?

Yes

No

Terminate

Perform required test and assess results

Satisfactory?

Yes

Monitor

No

Reject

Reject

Agrément SA procedure for certification

2005

TLA: ClassificationApplication

categoryNumber of vehicles

per lane per day Certificate

class

A > 10000 1A

B > 10000 1B

A 2000-10000 2A

B 2000-10000 2B

A < 2000 3A

B < 2000 3B

Category A: - speed limit ≤ 60 km/h- gradients > 6 per cent- intersections.Category B:- speed limit > 60 km/h- gradients ≤ 6 per cent

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