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Chemical Degradation of Concrete: Alkali-Silica Reaction (ASR)

Sponsored by the Office of Nuclear Regulatory Research and the Office of Nuclear Reactor Regulation

The purpose of this presentation is to inform the NRC staff, industry representatives, and the public about ASR, a chemical reaction that may occur over time in some concrete structures. This reaction causes expansion of the concrete by the formation of a gel when certain materials interact with water, which may cause cracking and a loss of strength of the concrete.

This poster will describe (1) the mechanics of the ASR degradation of concrete, (2) its effects on concrete properties (e.g., compressive strength), and (3) a project in progress to assess the performance of ASR-affected concrete structures.

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