Advantages and Benefits of Evotherm
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Evotherm provides several advantages over traditional hot mix asphalt including improved compaction, reduced thermal segregation, extended hauls and paving seasons. It allows increased usage of recycled asphalt pavement and longer binder life. Studies have shown Evotherm enables higher densities, longer workability at cooler temperatures, and less thermal cracking compared to hot mix asphalt. Evotherm is easy to use with any asphalt plant and has demonstrated performance benefits across many projects.
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Advantages and Benefits of Evotherm
- 1. Advantages & Benefits of Evotherm
- 5. TxDOT Densities 5% 3.2% 2.0% Evotherm is frequently used as a compaction aid to achieve density bonuses
- 6. NCAT Test Track Pavement Densities 200 220 240 260 280 300 320 340 % Density Compaction Temp (F) Evotherm Temp HMA Temp
- 7. Liquid Anti-Strip Replacement & Fiber Removal
- 15. Extended Hauls and Paving Season
- 17. HMA at 50ºF HMA has only 19 minutes of paving time until the minimum compaction temperature is reached. 19 Minutes
- 18. Evotherm at 50ºF 35 Minutes Evotherm has 35 minutes until the minimum compaction temperature is reached. > 80% Increase in compaction time
- 19. Evotherm at 1ºF 21 Minutes It would have to be 1 °F outside for Evotherm to behave like HMA at 50 °F !
- 21. Increased usage of RAP
- 23. Increased RAP in Missouri I-44 in Eureka, MO near St. Louis 12.5-mm Superpave mix with PG70-22 binder Increased RAP content by 75% while maintaining mix properties. Excellent workability in the lab and in the field. RAP savings of $4 per mix ton! 3.48 3.49 DSR @ 70 C 26 32 MSCR 7.35 7.56 DSR @ 64 C 38 42 Ductility 25,900 23,500 Viscosity 29 28 Penetration HMA 20% RAP Evotherm 35% RAP
- 26. Reduced Fuel Consumption and Emissions
- 27. Lower Emissions Hot Mix
- 28. Lower Stack Emissions with Evotherm compared to HMA 200 °F Evotherm, 310°F HMA control
- 29. What is WARM? Hot Mix Even at 276 °F, fumes are still visible.
- 30. Fume Exposure compared to HMA ↓ 41% Evotherm Below Detectable Limits ↓
- 32. Binder Hardening Reduced Oxidation with Evotherm
- 33. Aggregate Absorption Hot Mix Control TxDOT Cores After 1 Year
- 34. TTI Overlay Tester Results * Test stopped * *
- 35. TTI Overlay Tester Results - Limestone
- 41. Easy to Use, Lowest Temperatures, Proven Performance
Editor's Notes
- The mix was 3/4" with a modified PG 62-28 binder and had a 15% RAP content. Initial compaction temperatures were around 270 F. Eagle Peak was amazed that there were no chunks found after the belly dump. Eagel Peak President, Tony Cruse, claimed that the mix came out of the chute "like sand". Target densities were surpassed throughout the run. They were even able to compact mix that was placed in a water-filled rut without any cracking! Note: This was also Eagle Peak Paving’s first Evotherm job!