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Modelling of the sulfuric acid attack on different types of cementitious materials

Résumé : A chemical-reactive transport model was used to simulate the sulfuric acid attack of cement pastes based on ordinary Portland cement (CEM I), blended Portland cements (CEM III, CEM IV, and CEM V), and calcium aluminate cement (CAC). This model accounts for the dissolution of cement hydrates (portlandite, C-S-H, hydrogarnet), and the precipitation of deterioration products (ettringite and gypsum). Moreover, diffusion of the aqueous species in the pore space in the material is considered. With this model, we can get the hydrate contents, the porosity, and the deterioration phase contents throughout a sulfuric acid attack. Two indicators are defined to predict the service life of the cementitious materials: the deterioration depth and the dissolved calcium content. These two indicators showed that calcium aluminate cement provide a better resistance to sulfuric acid attack than that of Portland cements. This better resistance is mainly due to the partial dissolution of CAC hydrate as opposed to the total dissolutions of CH and C-S-H.
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Anaïs Grandclerc, Patrick Dangla, Marielle Gueguen Minerbe, Thierry Chaussadent. Modelling of the sulfuric acid attack on different types of cementitious materials. Cement and Concrete Research, Elsevier, 2018, 105, 67 p. ⟨10.1016/j.cemconres.2018.01.014⟩. ⟨hal-01880755⟩



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