Expansion results in cracking of concrete, raising concerns about structural integrity as well as the durability of the structural component. The reaction product, a hygroscopic gel, absorbs water and expands. When these three ingredients are all present, ASR takes place. The third, and necessary, ingredient for this chemical reaction is water or high internal relative humidity (~80% or higher) in concrete. ASR takes place when reactive aggregates are subjected to a high-alkali pore solution in concrete. Oguzhan Bayrak, University of Texas at Austin lthough there are a number of causes for the early deterioration of transportation structures, this article focuses specifically on one concrete durability problem, alkali-silica reaction (ASR), and my experience with it at the University of Texas. SAFETY AND SERVICEABILITY Alkali-Silica Reaction: Testing Demonstrates Unexpected Capacity by Dr.
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