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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
Pathology and management of diseased structures
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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Standards and norms
- Cement testing methods – Part 1: Determination of resistances. - NF EN 196-1 -
- Cement testing methods – Part 9: Hydration heat – Semi-adiabatic method. - NF EN 196-9 -
- Cement – Part 1: Composition, specifications and conformity criteria for common cements. - NF EN 197-1 -
- Concrete – Specification, performance, production and compliance. – National supplement to standard NF EN 206+A2. - NF EN...
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