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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'. Previous 5 Terms: Alkali-aggregate reaction (AAR) Alkali-carbonate reaction (ACR) alkalimeter alkaline alkalinity Next 5 Terms: Alkali-silicate-silica reaction (ASSR) Alkylate Alkylation allantoid allegany hardwood forest type About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.