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22 nd Conference Roads and Works - 2014 Asphalt Trial – Outcomes so far

22 nd Conference Roads and Works - 2014 Asphalt Trial – Outcomes so far. Rod Ellis Board Member IPWEA SA. Binder Filler Aggregate. What is Asphalt?. Light Vehicles No heavy turning Less 5E10^5 ESA. Low Volume Roads. Lower air voids needed to slow oxidation. Why the Trial ?.

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22 nd Conference Roads and Works - 2014 Asphalt Trial – Outcomes so far

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  1. 22nd Conference Roads and Works - 2014Asphalt Trial – Outcomes so far Rod Ellis Board Member IPWEA SA

  2. BinderFillerAggregate What is Asphalt?

  3. Light VehiclesNo heavy turningLess 5E10^5 ESA Low Volume Roads

  4. Lower air voids needed to slow oxidation Why the Trial ? Higher Binder needed to resist water penetration

  5. Because we need to slow aging process

  6. Linden et al (1989) “Asphalt pavement life is reduced by 10% for each % increase in voids above 7%” • Oliver 1992 “Ageing of binder greatly reduces for mixes that are compacted to 6% air voids and below” APRG technical noted light duty non structural asphalt surfaces and overlays (July 1997) • Aims: Low air voids (density) • High bitumen content (impermeability)

  7. Target 4-6% field air voids Goal of trial

  8. Local Government Research and Development Scheme 2012 • Led by The City of Salisbury with additional funding by the following Councils: • City of Salisbury • City of Burnside • City of Playford • City of Port Adelaide Enfield • West Torrens City Council • Adelaide Hills Council • City of Adelaide • City of Unley • City of Marion • Light Regional Council • IPWEA SA

  9. Collaborative Contribution of Expertise

  10. A: C320 B: C320 WMA C: C170 RAP D: C170 RAP WMA

  11. Fine AC mix DPTI – Part 227 and 228 – Fine AC mix http://www.dpti.sa.gov.au/contractor_documents/specifications_-_division_2_roadworks

  12. More fillerMore binderMore workableMore surveillance What did we learn? Low voids High voids

  13. Field Voids range 3-6% Field Voids (Average 6.5-7.5) - range 5.5-10% Target Current Practice

  14. 2014 LGA R&D Application15 sites - Fine AC 10WMA and RAPLaboratory Testing Durability Next step?

  15. Road Surface Management Field and Accounting Treatment

  16. Accounting Consideration • What defines the surface asset • Top surface • Multilayered surface (componentised?) • Surface Type • Hotmix, Spray Seal, Slurry • End of Life • Resurface no preparation • Resurface with patching • Resurface with pavements rejuvenation

  17. Intergenerational Consideration • Examples • Hotmix every 25 years( high voids) • Hotmix every 40 years (low voids) • Hotmix then after 40year spray seal • Spray seal every 20 year • Factors • Double and single • Edge profile cost or full width profile • Hotmix Field voids linked to life

  18. 100 year Renewal Cost alternatives for a typical street

  19. 100 year Renewal Cost Alternative

  20. WOL – Discounted Annual Cashflow 4% discount rate

  21. State Built up Low Volume Sealed network – 7640km (27 Councils) Large Centre‘s

  22. Rejuvenation ( management option for high void asphalt ?)

  23. Possible 100yr cost profile with Rejuvenation( typical Street)

  24. The Size of Opportunity • Councils with Large Urban Road Networks • 7640km, 27 Councils • Adopt low void hotmix (Fine AC) • Adopt a WOL strategy including all treatment options to extend AC life • Annual saving over $10Million to the state • Councils with Small and Remote Urban Roads • 2230km, 41 Council • Spray seal treatment selection critical

  25. The Size of Opportunity • Rural Road Network (outside Urban Centres) • 7400km, 68 Councils • Proactive Maintenance • Edge, Shoulder and drainage • Early intervention for resealing Note – many roads grant funded for construction but renewals are funded by council.

  26. Products • Polymer • Micro surfacing • Rejuvenation • AC10M, Fine AC10 • C320,C170 • WMA • RAP

  27. 22nd ConferenceRoads and Works - 2014To Spray or Not to Spray Rod Ellis, Board Member IPWEA SA Peter Levett - City of Salisbury Kelly Manning - AAPA

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