Alkali-Silica Reaction (ASR)

Alkali-Silica Reaction (ASR) is a chemical process in concrete where alkaline substances in the cement react with certain types of siliceous (silica-rich) minerals found in aggregates. This reaction produces a gel that absorbs water and expands over time, leading to internal pressures. This expansion causes cracking, weakening, and deterioration of the concrete structure. ASR is influenced by factors like the presence of reactive silica, moisture, and high alkali content in cement. Proper material selection and moisture control can help mitigate its effects, extending the lifespan of concrete structures.