United States Department of Transportation
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Abstract:A two and one-half day ASR Benchmarking Workshop was held between June 6 and 8, 2006 as part of the Federal Highway Administration's (FHWA's) effort to develop elements for an alkali-silica reactivity (ASR) Program. The need for this facilitated workshop was born out of the recently passed legislation entitled Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU). The objective of this workshop was to gather expert and stakeholder input regarding a comprehensive program of further development and deployment activities addressing techniques available presently and in the very near future to prevent and mitigate ASR. A total of 74 participants attended the workshop. Participants were from academia, industry, State Departments of Transportation, government agencies, and the host agency FHWA. Organization of the workshop was designed to bring forward presently available information regarding the state of technology, challenges faced with preventing and mitigating ASR and the methods that can be deployed in the field. Four topics were addressed during the discussion group sessions at the workshop: 1) ASR test methods and identification techniques; 2) ASR prevention in new construction and current specifications; 3) ASR mitigation in existing concrete; and 4) how do we approach the inventory of structures and pavements. This report provides a summary of discussions from each of the breakout groups as well as the recommended elements for the ASR program as discussed by the assembled group.
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