2011_AAPA_Study_Tour.. - Aapaq.org

Appendix 9.3- Question ListAAPA 2011 Study Tour Group ReportQ 20. To what extent are emulsions used in sealing? Is there a push to use emulsions based onenvironmental reasons?Q 21. What lab test method and limits are used to measure the storage stability and degradationof PMB’s?Q 22. Are high modulus asphalt technologies available? What lessons have been learnt in theacquisition of the necessary materials and skills to deliver the asphalt? Will the material besubjected to APT and is it likely to be included in the SA Pavement Design Method?Q 23. Is binder sampled at point of use for quality assessment? If so how, and what tests areundertaken?C: Improving Pavement PerformanceQ 1. What is Godzilla and is it likely to spread into other countries? Feedback on this clearly a bigand ambitious project and its links to performance records, wider range of engineering andreference testing and use in full pavement & surfacing performance would be valuable!Q 2. Is the Fatigue Endurance Limit concept to be included in South African pavement design?Q 3. Is the “perpetual pavement concept” of value and is the international efforts on this likely toimpact on pavement thickness design?Q 4. What accelerated pavement testing is being undertaken? How is it input into current designmodels? Are there links to international APT facilities? Are there links to the NCAT testtrack?Q 5. Has the investment in APT improved the performance of the South African roads network?Explain if yes.Q 6. Are high modulus asphalt technologies available? What lessons have been learnt in theacquisition of the necessary materials and skills to deliver the asphalt? Will the material besubjected to APT and is it likely to be included in the SA Pavement Design Method?Q 7. How have you managed to calibrate local test methods with the French EME mix designmethods? Have you established equivalent test values for fatigue and wheel trackingperformance?Q 8. What parameters have you used to obtain the required properties for EME bitumen iePenetration Index etcQ 9. What is the local experience with regards to early life skid resistance and permeability ofSMA? Do you apply grit and how do you prevent ingress of water into the pavement? Whatare your permeability and texture requirements?Q 10. What are your mix design and field compaction requirements for BTB?Q 11. How are high performance thin asphalt surfacing specified and tested for compliance? Hasthe Agrement system been implemented and how has it been accepted by the Industry?Q 12. What key pavement evaluation tests for network level evaluation? Is Ground PenetratingRadar being used? Are standard network level tests undertaken across the South Africannetwork or are the results assessed differently in each of the Provinces? Are theredifferences between the approaches used for urban networks vs non-urban?Q 13. What methods are used to avoid/delay reflection of underlying asphalt cracking whenresurfacing/overlay with asphalt? What results are achieved?V4-2 Page 131