What is Alkali-Silica Reaction (ASR)?

Often called 'concrete cancer,' Alkali-Silica Reaction (ASR) is a chemical reaction between alkalis in the cement paste and reactive silica found in certain types of aggregate. This reaction produces a gel that swells when it absorbs moisture, exerting tremendous pressure from inside the concrete and causing extensive 'map cracking.' Unlike simple corrosion, ASR affects the concrete matrix itself. While it cannot be reversed, its effects can be managed by limiting moisture ingress using specialized waterproofing and breathability strategies.