Definition of Alkali-aggregate reaction

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Alkali-aggregate reaction Definition from Science & Technology Dictionaries & Glossaries
Moxie International's Glossary of Concrete Terms
The chemical reaction in concrete or mortar between alkalies (sodium and potassium oxides) from portland cement or other sources and certain constituents of some aggregates, primarily certain phases of silica, which causes deterioration in the form of strength loss, excessive expansion, and cracks in the concrete or mortar.
Alkali-aggregate reaction Definition from Encyclopedia Dictionaries & Glossaries
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For more information on this subject, please, refer to the main article named alkali–silica reaction. The present page is aimed to reorient you to a particular and more appropriate topic.
Alkali–aggregate reaction is a term mainly referring to a reaction which occurs over time in concrete between the highly alkaline cement paste and non-crystalline silicon dioxide, which is found in many common aggregates. This reaction can cause expansion of the altered aggregate, leading to spalling and loss of strength of the concrete.

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