Abstract Body

Civil engineers are liable to take measures to reduce their negatives impacts on marine biodiversity by selecting more bioreceptive construction materials, for marine infrastructure design. By the way, biodiversity conservation is a global target. It was shown that the early ecological performance, assessed by monitoring biofilm colonisation, is crucial in the selection of the most appropriate mix design but this work needs to be expanded into testing those designs in different environmental contexts. We'll demonstrate in this presentation that the pre-carbonation of cementitious materials accelerates their early biocolorization by lowering the pH of their surface. We've been shown, both in the laboratory and in-situ tests, that the bacterial colonization of cementitious materials is influenced by the pH, the surface design, the chemical composition and also by 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 presents and verifies a novel experimental laboratory approach which can be used to evaluate the bacterial colonization (bioreceptivity) of cementitious materials in marine environments. 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, to lower their impact on the ecosystem by construction projects