Page 10 - Foxfire Integral Crystalline Waterproofing

Concrete Degradation Mechanisms: Alkali-Silica Reaction (ASR)
ASR refers to a swelling reaction that occurs over time in concrete between the highly alkaline cement paste and the reactive non-crystalline (amorphous) silica found in many common aggregates, given sufficient moisture. This reaction can cause expansion, and subsequent spalling or cracking of the concrete.