1. STH 21 Adams County Project # 6160-03-82

2. Project Specifics Project Specifics Asphaltic Pavement Milling Asphaltic Pavement Milling Pulverizing Shoulders Pulverizing Shoulders 38,000 tons HMA Pavement type E-3 38,000 tons HMA Pavement type E-3 Added WMA to the Contract Added WMA to the Contract Project Length = 13 mi

5. Paving

6. Existing Deteriorated Pavement New HMA Pavement

7.  Most projects pave HMA for a section of roadway, and then WMA for the next section.  This project allowed a unique opportunity for side-by-side comparison of long term performance.

8. WMA technology allows asphalt mixes to be produced at a reduced temperature. WMA technology allows asphalt mixes to be produced at a reduced temperature. What is WMA?

9. Hot Mix Asphalt 275-300 F Hot Mix Asphalt 275-300 F Warm Mix Asphalt 220-240 F Warm Mix Asphalt 220-240 F Cold Mix Asphalt 60 F Cold Mix Asphalt 60 F

10. Evotherm was added at the mix plant

11.  Extended Paving Season  Decreased Binder Aging  Economic and Environmental Benefits  Increased RAP usage

12. Decreased Emissions

13. How does it work? The basic function of WMA technology is to change the binder properties at lower temperatures to allow for sufficient coating of the aggregates, while maintaining good workability and durability.

15. HMA WMA

16. Project Mix Designs

17. Cost of WMA  Cost of HMA = $51.48 / ton  Cost of WMA = $52.01 / ton  Cost per ton difference = $0.53  Added cost to the project = $10,129

18. Which lane is WMA?

19. Decreased binder aging, light oils never reach boiling point (285 F) Pavement stays blacker, longer WMA

25. Questions???????