The use of SCC has a particular interest in terms of sustainable development. Indeed, their specific formulation leads to a greater volume of dough than for common concretes, thus, a larger quantity of cement. However, for economical, ecological and technical reasons, it is sought to limit their cement content [1]. It is therefore necessary to almost always use mineral additions as a partial replacement for cement because the technology of self-compacting concretes can consume large quantities of fines, in this case calcinated mud issued from dams dredging sediments that can give and/or ameliorate characteristics and performances of this type of concretes. Four SCCs had been formulated from the same composition where the only percentage of calcinated mud of Chorfa (west of Algeria) dam changed (0%, 10%, 20% and 30%). The effect of calcinated mud on characteristics at fresh state of SCC according to AFGC was quantified. Mechanical strengths and shrinkage deformation (total, autogenous, drying) were evaluated. The results show the possibility to make SCCs with different dosages of calcinated mud having strengths that can defy those of the control SCC. The analysis of free deformations indicates the beneficial impact of the mud by contributing to decrease the amplitudes of the shrinkage compared to those of the control SCC.

Our study will focus on life cycle assessment (LCA) of dredged sediments in its environment from sediment extraction to waste treatment. This tool is part of an environmental management approach, to compare the environmental loads of the different stages of the life cycle of the same product and to deduce which stage of the scenario is the most polluting in environmental terms. Optimize the modeling of industrialization process of dredged sediments using the SimaPro 8.2.3 software to propose a model that is the most respectful of the environment. We will focus on the environmental impacts; we will try to propose the most environmentally friendly scenario to exploit these dredged sediments in the field of building construction.

en génie civil et mécanique (GeM) et l'institut catholique d'art et des métiers

Abstract. The use of SCC has a particular interest in terms of sustainable development. Indeed, their specific formulation leads to a greater volume of dough than for common concretes, thus, a larger quantity of cement. However, for economical, ecological and technical reasons, it is sought to limit their cement content [1]. It is therefore necessary to almost always use mineral additions as a partial replacement for cement because the technology of self-compacting concretes can consume large quantities of fines, in this case calcinated mud issued from dams dredging sediments that can give and/or ameliorate characteristics and performances of this type of concretes. Four SCCs had been formulated from the same composition where the only percentage of calcinated mud of Chorfa (west of Algeria) dam changed (0%, 10%, 20% and 30%). The effect of calcinated mud on characteristics at fresh state of SCC according to AFGC was quantified. Mechanical strengths and shrinkage deformation (total, autogenous, drying) were evaluated. The results show the possibility to make SCCs with different dosages of calcinated mud having strengths that can defy those of the control SCC. The analysis of free deformations indicates the beneficial impact of the mud by contributing to decrease the amplitudes of the shrinkage compared to those of the control SCC.Résumé. L'utilisation des BAP revêt un intérêt particulier en termes de développement durable. En effet, leur formulation spécifique conduit à un volume de pâte plus important que pour des bétons traditionnels et donc, a priori, à une plus grande quantité de ciment. Or, pour des raisons économiques et des considérations d'ordre écologiques et techniques, on cherche à limiter leur teneur en ciment [1]. Il est donc nécessaire d'utiliser quasi systématiquement des additions minérales en remplacement partiel au ciment car la technologie des bétons autoplaçants est capable de consommer d'énormes quantités de fines en l'occurrence la vase calcinée issue des sédiments de dragage des barrages, qui à son tour pourrait apporter et/ou améliorer des caractéristiques et performances de ce type de bétons. Quatre BAP ont été formulés à partir d'une même composition où seul le pourcentage de la vase calcinée issue des sédiments de dragage du barrage de Chorfa (ouest algérien) change (0%, 10%, 20% et 30%). L'effet de la vase sur les caractéristiques des BAP à l'état frais a été quantifié. Des résistances mécaniques et les déformations de retrait (total, endogène et de dessiccation) ont été évaluées. Les résultats montrent la possibilité de confectionner des BAP avec différents dosages en vase calcinée ayant des résistances qui peuvent défier celles du BAP témoin. L'analyse des déformations libres indique l'impact bénéfique de la vase en contribuant à diminuer les amplitudes du retrait par rapport à celles du BAP témoin.