A certain reaction

摘要

Find solutions for diagnosing and mitigating alkali-silica reaction (ASR) in concrete through the many resources available from the Federal Highway Administration's (FHWA) ASR program. Launched in 2006, the program's goals are to increase concrete pavement and structure durability and performance and reduce life-cycle costs through the prevention and mitigation of ASR. ASR occurs when silicas in some aggregates and alkalis in concrete combine with water to form a gel-like substance. As the gel absorbs water and expands, it causes the concrete to crack. Over time, these cracks can then enable other modes of distress to occur, such as freeze-thaw damage or corrosion.