2011_AAPA_Study_Tour.. - Aapaq.org

More documents

Recommendations

Info

6. Improving pavement performance - Questions & Responses AAPA 2011 Study Tour Group ReportKim Jenkins presentation “Bitumen Stabilised Materials – Recycling Technology Update”Q 17. What new concepts and pavement performance options are under research?New concepts currently being researched includes among others:• probabilistic and recursive modelling• low volume roads• energy and emissions for road construction and rehabilitationQ 18. What sustainability and CO2 reduction drivers exist in the roads sector and how are theybeing evaluated and addressed against pavement performance? Are trade-offs permittedfor reduced performance but improved sustainability? (use of lower standard materials,recycled waste materials etc)This question is addressed through the Sustainability chapter.Currently product comparisons are undertaken including the amount of energy consumed inproduction and maintenance as well as the CO2 generation of the alternates. This has not yetbeen embedded in the decision making process of the road agencies.Sabita publication belowV4-2 Page 88
6. Improving pavement performance - Questions & Responses AAPA 2011 Study Tour Group ReportThe industry is also evaluating its energy footprint and options for CO2 reduction across itsoperations the findings are captured in the Sabita: Implication of the Proposed Carbon TaxLegislative and Policy Framework on SABITA members – February 2011.Q 19. Do they consider maintenance minimisation in the road design especially in the design andconstruct type contracts?No, generally not. The lowest life cycle cost approach is more favoured, even in DF&C contracts.However the maintenance capability of the asset owner is considered when selecting theappropriate materials for the project. Typically a high risk (thin) surfacing would not be selected itthe road authority had limited maintenance capability.Refer Sabita Manual 10: Appropriate standards for bituminous materials.Q 20. How do they approve asphalt mix designs and what is their process of validation?Asphalt mixes are being assessed per project. No asphalt mix certification schemes are in placeand each project certifies the mix for use on that project. Validation are generally throughspecified performance testing which may includes rutting, fatigue, moisture susceptibility,permeability, etc.For the domestic and municipal markets asphalt suppliers produce a range of products complyingwith local standard mixes or COLTO mixes adapted for municipal conditions (generally increasedbinder contents). The local government sector has an asphalt specification which was developedin conjunction with Sabita.Q 21. What is the South African approach to managing skid resistance?.Skid resistance is currently being measured regularly only on national roads. Data are entered intoa database, together with the other PMS data recorded and the road are flagged if a problem isdetected with skid resistance. The main mechanism to manage skid resistance is in the selectionof high quality aggregate and to prevent the use of surfacing aggregate that have a polishingpotential as far as practically possible. Where this is not possible, skid resistance will bemonitored closely and resurfacing interventions may be scheduled earlier.The minimum PSV for aggregates in the COLTO specification is 50 for SMA, continuous & gapgraded asphalt and rolled in chippings, 45 for gap graded surfacing. The Engineer(Superintendent) is authorized to accept lower PSV aggregates.Reference : COLTO specificationV4-2 Page 89
Page 1 and 2:
Australian Asphalt Pavement Associa
Page 3 and 4:
Contents1. EXECUTIVE SUMMARY 22. IN
Page 5 and 6:
1. Executive Summary AAPA 2011 Stud
Page 7 and 8:
2. INTRODUCTIONIn the forty year hi
Page 9 and 10:
3. Overview and Recommendations AAP
Page 11 and 12:
3. Overview and Recommendations AAP
Page 13 and 14:
4. Surface Treatments Questions and
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40: 4. Surface Treatments Questions and
Page 41 and 42: 4. Surface Treatments Questions and
Page 43 and 44: 4. Surface Treatments - Reference M
Page 45 and 46: 5. Binders AAPA 2011 Study Tour Gro
Page 57 and 58: 5. Binders Questions and Responses
Page 65 and 66: 5. Binders - References AAPA 2011 S
Page 67 and 68: 6. Improving Pavement Performance A
Page 73: 6. Improving Pavement Performance A
Page 78: 6. Improving Pavement Performance A
Page 81: 6. Improving pavement performance -
Page 84 and 85: 6. Improving pavement performance -
Page 92 and 93: 6. Improving pavements performance
Page 94 and 95: 7. Sustainability AAPA 2011 Study T
Page 100 and 101: 7. Sustainability - Questions & Res
Page 114 and 115: 8. CAPSA’11 & General AAPA 2011 S
Page 116 and 117: 8. CAPSA’11 & General AAPA 2011 S
Page 118 and 119: 8. General - Questions & Responses
Page 120 and 121: 8. General - Questions & Responses
Page 122 and 123: Appendix 9.1 - Detailed ItineraryAA
Page 124 and 125: Appendix 9.1 - Detailed ItineraryAA
Page 126 and 127: Appendix 9.2 - Study Tour Delegates
Page 128 and 129: Appendix 9.2 - Study Tour Delegates
Page 131: Appendix 9.3- Question ListAAPA 201
Page 134 and 135: Appendix 9.3- Question ListAAPA 201
Page 136 and 137: Appendix 9.3- Question ListAAPA 201
Page 138 and 139: Appendix 9.4 - South African Acrony
Page 140 and 141:
Appendix 9.4 - South African Acrony
Page 142 and 143:
Appendix 9.5 - ReferencesAAPA 2011
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150:
Australian Asphalt Pavement Associa
show all

2011_AAPA_Study_Tour.. - Aapaq.org

Create successful ePaper yourself

Delete template?

Save as template?