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by Steve Saboundjian Research Implementation Engineer ADOT&PF Research & T2

Cost-Effectiveness of Hard Aggregate Sources. A Presentation to the Asphalt Pavement Summit Anchorage, 11-13-02. by Steve Saboundjian Research Implementation Engineer ADOT&PF Research & T2. Cost-Effectiveness of Hard Aggregate Sources.

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by Steve Saboundjian Research Implementation Engineer ADOT&PF Research & T2

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  1. Cost-Effectiveness of Hard Aggregate Sources A Presentation to the Asphalt Pavement Summit Anchorage, 11-13-02 by Steve Saboundjian Research Implementation Engineer ADOT&PF Research & T2 Statewide Research and Technology Transfer

  2. Cost-Effectiveness of Hard Aggregate Sources • Initiated by SE Region: to minimize studded tire wear • Objectives: • - to evaluate the economic feasibility of transporting high- quality aggregate for use in HMA surfacing • - to develop a method of performing benefit/cost analysis • Draft final report being reviewed by the TAC Statewide Research and Technology Transfer

  3. Cost-Effectiveness of Hard Aggregate Sources • Task I - Data Collection & Literature Review • Pavement performance data (rut depth): • - ADOT 2001 PM Dbase; 30-35 projects/region • Materials data: • - HMA type (SMA, Spave, conv.HMA, PMAC) • - Aggregate hardness (LA abrasion, Nordic abrasion) • Asphalt grade • All info in an Access Dbase • Literature review: ODOT, ADOT Statewide Research and Technology Transfer

  4. Cost-Effectiveness of Hard Aggregate Sources • Task II - To use the data gathered in Task I to develop pavement performance trends • Achieved in 3 steps by determining: • 1- Winter wear vs summer wear: • 67% of the annual rutting occurs in winter • 2- Pavement performance life based on rut wear only: • plots of “rut depth vs cumulative vehicle passes” Statewide Research and Technology Transfer

  5. Cost-Effectiveness of Hard Aggregate Sources Anch. & Jun. winter wear rate ~ 3.8 times Frbks Statewide Research and Technology Transfer

  6. Cost-Effectiveness of Hard Aggregate Sources • Total Rut = 0.5” at 51M passes ~ 18 years Statewide Research and Technology Transfer

  7. Cost-Effectiveness of Hard Aggregate Sources • Total Rut = 0.5” at 36M passes ~ 10 years Statewide Research and Technology Transfer

  8. Cost-Effectiveness of Hard Aggregate Sources • Total Rut = 0.5” at 22M passes ~ 12 years Statewide Research and Technology Transfer

  9. Cost-Effectiveness of Hard Aggregate Sources • Total Rut = 0.5” at 80M passes ~ 46 years Statewide Research and Technology Transfer

  10. Cost-Effectiveness of Hard Aggregate Sources • On average, performance predictions for the 3 regions is: • Anchorage …. 12 years • Juneau ……... 12 years • Fairbanks …... 46 years ……. Explanations: • 1- Reduced % of vehicles using studded tires • 2- Maintenance practices • 3- Hardness of the river bed aggregates • 4- Many of the Frbks sections were old pavements: “something in the older specf./construction procedures (from the 70’s & 80’s) worked well relative to more recent specfs. (90’s).” Statewide Research and Technology Transfer

  11. Cost-Effectiveness of Hard Aggregate Sources • Task II achieved in 3 steps by determining: • 3- Cost of HMA materials in the 3 regions: • Anchorage: Type II: $31/ton; SMA: $51-62/ton • Juneau: Type II: $52/ton • Fairbanks: Type II: $42/ton • Using Fairbanks as the standard, comparative potential costs for Anchorage and Juneau mixes were computed (spreadsheet + appendix) • Anchorage (SMA Aggr.) and Juneau (Type II Aggr.) could justify the expense of 1.5 -1.8 times their current aggregate costs to increase pavement performance life. Statewide Research and Technology Transfer

  12. Cost-Effectiveness of Hard Aggregate Sources • Aggregate Importation: • To Anchorage: • - from Fairbanks: by truck (18-ton haul units) • - from BC and WA: by super-barges (60k ton) • To Juneau: • - from Fairbanks (by truck) to Valdez (by barge) • - from BC, WA, OR: by super-barges Statewide Research and Technology Transfer

  13. Cost-Effectiveness of Hard Aggregate Sources • Recommendations for action by ADOT&PF: • Implement harder aggregate requirements on roadways with > 1M ESALs • Use harder aggregate requirements for surface courses only • Increase the high temperature binder grade for roadways with > 1M ESALs • Develop a strong partnering program with the HMA and aggregate industries within the state for the implementation of the aggregate requirement changes Statewide Research and Technology Transfer

  14. Cost-Effectiveness of Hard Aggregate Sources • Recommendations for action by ADOT&PF (cont’d): • Provide information to HMA producers regarding the availability of harder aggregate sources in Vancouver, Canada, at reasonable costs by barge • ADOT&PF should evaluate some of the potential aggregate sources inside and outside of the state for properties, especially the Nordic Abrasion Value Statewide Research and Technology Transfer

  15. Cost-Effectiveness of Hard Aggregate Sources Statewide Research and Technology Transfer

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