TeachMeFinance.com - explain Alkali-silica reaction (ASR)
Alkali-silica reaction (ASR) The term 'Alkali-silica reaction (ASR)' as it applies to the area of reclamation can be defined as ' Reaction of alkalis with aggregate with various forms of poorly crystalline reactive silica: opal, chert, flint and chalcedony and also tridymite, crystoblite and volcanic glasses. Aggregate containing such materials (e.g., some cherty gravels) may cause deterioration of concrete when present in amounts of 1% to 5%. Concrete made of these aggregates is characterized by the early onset of a relatively rapid expansion. Cracking of structures is often observed within 10 years of construction. See alkali-aggregate reaction'.
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