Technical Report Documentation Page 1. Report No. SWUTC/08/473700-00080-1 2. Government Accession No. 3. Recipient's Catalog No. 4. Title and Subtitle A Review of Warm Mix Asphalt 5. Report Date December 2008 6. Performing Organization Code 7. Author(s) Arif Chowdhury and Joe W. Button 8. Performing Organization Report No. Report 473700-00080-1 9. Performing Organization Name and Address Texas Transportation Institute Texas A&M University System College Station, Texas 77843-3135 10. Work Unit No. (TRAIS) 11. Contract or Grant No. DTRS99-G-0006 12. Sponsoring Agency Name and Address Southwest Region University Transportation Center Texas Transportation Institute Texas A&M University System College Station, Texas 77843-3135 13. Type of Report and Period Covered Technical Report: September 2005 – December 2008 14. Sponsoring Agency Code 15. Supplementary Notes Supported by a grant from the U.S. Department of Transportation, University Transportation Centers Program Project Title: Review of Warm Mix Asphalt in the US 16. Abstract Warm Mix Asphalt (WMA) technology, recently developed in Europe, is gaining strong interest in the US. By lowering the viscosity of asphalt binder and/or increasing the workability of mixture using minimal heat, WMA technology allows the mixing, transporting, and paving process at significantly lower temperature. Using this new technology, asphalt mix can be produced as much as 100ºF lower than traditional hot mix asphalt (HMA). Several benefits of lower mixing and compaction temperature include: less emission, savings in energy cost, longer construction season, less odor, and construction during non-peak periods. Despite the apparent benefits, some researchers are concerned about the long-term performance of this new mixture. In last few years, dozens of field test sections have been constructed thorough out the USA using different WMA technologies. It is too early to report the performance; but so far, no negative performance has been reported in the literature. In the last few years, several large national and state level research projects have been initiated to evaluate, validate, and implement this new technology. This report documents the results of a comprehensive review of worldwide information dealing with the following issues as related to warm mix asphalt: Current state of the art/practice of WMA; cost and benefits of WMA technology; plant modifications to accommodate WMA; mixture design; durability and performance; performance related testing; quality control; specifications; and construction guidelines. 17. Key Words Warm Mix Asphalt, Hot Mix Asphalt 18. Distribution Statement No restrictions. This document is available to the public through NTIS: National Technical Information Service Springfield, Virginia 22161, http://www.ntis.gov 19. Security Classif.(of this report) Unclassified 20. Security Classif.(of this page) Unclassified 21. No. of Pages 75 22. Price Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
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