1. Mechanism of the internal sulfate reaction
The phenomenon of internal sulfate reaction (ISR) results from the delayed formation of a mineral called "ettringite" with the chemical formula 3CaO.Al 2 O 3 .3CaSO 4 .32H 2 O.
This delayed formation of ettringite can lead to expansion, manifested by the appearance of relatively large-mesh, multidirectional cracking on the concrete surface.
However, ettringite is not systematically harmful to concrete, as it is a normal product of cement hydration. That's why we've provided the following information on the different types of ettringite found in concrete.
1.1 Different...
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Mechanism of the internal sulfate reaction
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Bibliography
- (1) - HORNAIN (H.), ROUGEAU (P.) - Dégradations du béton liées à l'action des sulfates et aux phénomènes d'alcali-réaction – - Dans Grandeurs associées à la Durabilité des Bétons sous la direction de G. Arliguie et H. Hornain, Presses de l'École Nationale des Ponts et Chaussées, pp. 205-262 (2007)....
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