Alkali-Carbonate Reaction in Concrete: Mechanisms and Microstructural Impact

This study delves into the alkali-carbonate reaction (ACR) in concrete, focusing on the microstructural changes and expansion mechanisms it induces. Unlike alkali-silica reaction (ASR), ACR involves dedolomitization and formation of brucite, leading to volume changes and potential cracking. Through petrographic and microanalytical techniques, the research reveals how reactive carbonate aggregates contribute to concrete deterioration, emphasizing the need for preventive design and material selection.

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