alkali-aggregate reaction


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alkali-aggregate reaction

[′al·kə‚lī ′ag·rə·gət rē′ak·shən]
(chemistry)
The chemical reaction of an aggregate with the alkali in a cement, resulting in a weakening of the concrete.

alkali-aggregate reaction

A chemical reaction in mortar or concrete between alkalies from portland cement or other sources and certain constituents of some aggregates; under certain conditions, deleterious expansion of the concrete or mortar may result.
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References in periodicals archive ?
On the aar susceptibility of granitic and quartzitic aggregates in view of petrographic characteristics and accelerated testing, in 14th International Conference on Alkali-Aggregate Reactions in Concrete, 20- 25 May 2012, Austin, Texas, USA.
A major diagnostic symptom which confirms the occurrence of the alkali-aggregate reaction is the presence of the reaction products (alkali silicate gel) in the concrete.
Diagnosis and Control of Alkali-Aggregate Reactions in Concrete.