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In vitro and in situ tests to evaluate the bacterial colonization of cementitious materials in the marine environment

Mahmoud Hayek 1 Marie Salgues 1 Frédéric Habouzit 2 Sandrine Bayle 3 Jean-Claude Souche 1 Klaartje de Weerdt 4 Sylvain Pioch 5
1 DMS - Durabilité des éco-Matériaux et Structures
LMGC - Laboratoire de Mécanique et Génie Civil, C2MA - Centre des matériaux des Mines d'Alès
3 EUREQUA - Etude des Risques et de la Qualité de l’air
LGEI - Laboratoire de Génie de l'Environnement Industriel et des Risques Industriels et Naturels, LSR - Laboratoire des Sciences des Risques
Abstract : Civil engineers have a responsibility to take measures to protect marine biodiversity by selecting more bioreceptive construction materials in the design of marine infrastructure, for better biodiversity conservation. In this study, it was shown that pre-carbonation of cementitious materials accelerates their bacterial colorization by lowering the pH of their surface. It has been shown both in the laboratory and in-situ tests that the bacterial colonization of cementitious materials is influenced by the pH and the type of cement. By comparing the bacterial colonization of Portland cement mortars, CEM I, and slag cement, CEM III, mortars, it was found that the CEM III mortars are more bioreceptive than the CEM I mortars. This study presented and verified a novel experimental laboratory approach which can be used to evaluate the bacterial colonization (bioreceptivity) of cementitious materials in marine environment. The approach could be taken up in future recommendations to enable engineers to eco-design more eco-friendly marine infrastructure and develop green-engineering projects.
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Mahmoud Hayek, Marie Salgues, Frédéric Habouzit, Sandrine Bayle, Jean-Claude Souche, et al.. In vitro and in situ tests to evaluate the bacterial colonization of cementitious materials in the marine environment. Cement and Concrete Composites, Elsevier, 2020, 113, pp.103748. ⟨10.1016/j.cemconcomp.2020.103748⟩. ⟨hal-02913606⟩

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