##  [Alkali–Silica Reaction](/alkali-silica-reaction) 

  ##  [Alkali–Silica Reaction](https://engineering.quantumdictionary.io/alkali-silica-reaction-0) 

  

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**Engineering & Applied Technologies Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A chemical degradation process in concrete in which alkalis (sodium and potassium) from cement pore solution react with certain forms of reactive silica in aggregates to produce a hygroscopic, gel‑like product that swells when it absorbs moisture, generating internal expansive stresses that crack and deteriorate the concrete; reaction requires reactive silica, sufficient alkali availability and mo