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alkali-aggregate reaction

alkali-aggregate reaction A chemical reaction that can lead to damage in concrete structures. Free lime (CaO) in cement reacts with CO2 in the atmosphere to precipitate CaCO3 around the cement grains. This protects them from weathering and also gives an alkalinity level (pH higher than 7) which helps to protect steel from corrosion. If the aggregate contains soluble silica, however, new minerals may be precipitated by reaction between the aggregate and the cement. These may absorb water, causing the concrete to swell and eventually crack. Water entering these cracks may cause rusting of reinforcement bars and repeated wetting and drying may eventually destroy a structure.

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alkali-aggregate reaction

alkali-aggregate reaction A chemical reaction that can lead to damage in concrete structures. Free lime (CaO) in cement reacts with CO2 in the atmosphere to precipitate CaCO3 around the cement grains. This protects them from weathering and also gives an alkalinity level (pH higher than 7) which helps to protect steel from corrosion. If the aggregate contains soluble silica, however, new minerals may precipitate by reaction between the aggregate and the cement. These may absorb water, causing the concrete to swell and eventually crack. Water entering these cracks may cause rusting of reinforcement bars and repeated wetting and drying may eventually destroy a structure.

Cite this article
Pick a style below, and copy the text for your bibliography.

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"alkali-aggregate reaction." A Dictionary of Earth Sciences. . Encyclopedia.com. 18 Feb. 2018 <http://www.encyclopedia.com>.

"alkali-aggregate reaction." A Dictionary of Earth Sciences. . Encyclopedia.com. (February 18, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/alkali-aggregate-reaction

"alkali-aggregate reaction." A Dictionary of Earth Sciences. . Retrieved February 18, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/alkali-aggregate-reaction

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Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

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The Chicago Manual of Style

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American Psychological Association

http://apastyle.apa.org/

Notes:
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