NINTH ROAD PAVEMENT FORUM 11 May 2005 DEVELOPMENT OF NATIONAL GUIDELINE ON ASPHALT REINFORCEMENT

RECAP - THE NEED  Need identified in Asphalt Reinforcing (AR)  Uncertainty on use/benefits of AR  Provide: Toolbox for new entrants Best practice document for design/construction  Road Pavement Forum initiated process to address need

RECAP- SCOPE Covers Asphalt Reinforcement used for: Resistance against cracking, rutting Strengthening of asphalt layer All types of interlayers (not fibres) Asphalt (not surfacing seals) southern African region

RECAP- WORKING GROUP Suppliers 3 Contractors2 Road Owners2 Consultants3 Research3

Activities - GUIDELINE DOCUMENT 1 st Draft Document compiled – (Contents) Internal Review – Scheduled for July 2005 Decisions: Publisher / Owner? Release?

Activities - PROJECT DATABASE 29 Projects entered into CSIR Database First entry with ”before and after” information received Provide control sections where possible Need more input from industry

Activities - INTERNATIONAL CONTACT Information gathered from Conferences (e.g. RILEM 2004) Contact with European Research Project - COST348 Information shared with other contacts

Activities - HVS TESTING HVS Asphalt testing programme – Planning in progress May be possible to include AR sections Follow-up in progress

Success Factors: Industry contribution to guideline development Interested persons contact Work Group WAY FORWARD Currently: Complete 1 st Draft Guideline Review Guideline with external inputs Follow up COST348 and HVS?

THANK YOU

TYPE OF DOCUMENT Immediate need is for Guidelines Can be developed into Code of Practice later At present, not Agrément or PPGS route

DEVELOPMENT OF DOCUMENT Do not re-invent the wheel Two path approach: 1.International Literature / Research review 2.Southern African Project Database

1. INTERNATIONAL LITERATURE REVIEW International Guideline Documents (e.g. Handbook of Geosynthetics – GMA) Recent conference proceedings (e.g. RILEM 2004) Recent / current research (e.g. COST 348 and Reflex)

2. PROJECT DATABASE OBJECTIVES: What are success or failure factors? Collect essential information in structured way Add usefull information where available Develop southern African project database

2. PROJECT DATABASE (CONTINUED)  Database developed at CSIR, Transportek  Standardised questionnaires for data collection  Database open to all interested  Use as information for case studies

PROJECT DATABASE

PROJECT DATABASE

Currently 27 Projects in Database

PROJECT DATABASE

Output example from Query of projects constructed after 2000, traffic of more than 2000 AADT and AC thickness of > 30 mm. PROJECT DATABASE

GUIDELINE DOCUMENT - CONTENT 1.Functions / Benefits of AR 2.Considerations in selection of AR Types 3.Evaluation of existing pavement condition (e.g. FWD, Crack Activity Meter) 4.Design methods (e.g. Catalogue, Experience, Theoretical) 5.Specification of materials (Geometric & Mechanical properties)

DOCUMENT - CONTENT (CONTINUED) 6.Surface preparation (e.g. patching, seal cracks, leveling course, rut filling) 7.Practical construction issues (e.g. tack coat, overlay construction, overlap, packaging) 8.Quality control and material testing 9.Database of projects 10.Future research subjects

Success Factors: Contribution of industry experience to documentation process. Provide control sections where possible WAY FORWARD Currently: In major data / information-gathering phase Phase should provide valuable inputs to Guidelines First Draft Guidelines for comment: March 2005