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Construction d'outils opérationnels pour l'évaluation du comportement des matériaux cimentaires en réseau d'assainissement

Abstract : Several deteriorations of concrete were detected in sewer environment. Some of these deteriorations are due to hydrogen sulphide presence in the aerial part of sewer pipe. Indeed, some microorganisms (mainly sulfur-oxidizing microorganisms) consume H2S as nutrients and provoke oxidation of H2S into sulfuric acid. This sulfuric acid production leads to the cementitious matrix dissolution and expansive products formation (gypsum and ettringite). These mechanisms conduct to expensive work of rehabilitation and more efficient solutions are essential, in particular for the choice of materials, to a better management of wastewater collection systems. The aim of this study is to determine the behaviour of different cementitious materials exposed to sewer pipe conditions over time. A laboratory test and a model were proposed to answer to this request. The laboratory test reproduces and accelerates biodeterioration mechanisms. Different cementitious materials (mortars based on CEM I, CEM III, CEM V, and CAC cements) were exposed to this test and their behavior was studied thanks to three sustainability criteria (visual aspect, surface pH, and weight loss). The better resistance of CAC mortars is strongly highlighted with these sustainability criteria. The model used simulates the sulfuric acid attack of the same cements as in the experimental part. This model also highlights the better resistance of CAC cement and the main reason is the mineralogical composition of this type of cement. Consequently, these two technics lead to preconize a chemical composition adapted to these aggressive conditions.
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Submitted on : Tuesday, January 22, 2019 - 4:46:25 PM
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Grandclerxc et al TSM 2018 ver...
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Anaïs Grandclerc, Marielle Gueguen Minerbe, Issam Nour, Nadia Dominique, Patrick Dangla, et al.. Construction d'outils opérationnels pour l'évaluation du comportement des matériaux cimentaires en réseau d'assainissement. TSM (Techniques, Sciences, Méthodes), 2018, pp. 75-87. ⟨10.1051/tsm/201810075⟩. ⟨hal-01950107⟩



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