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Mise au point d’une méthodologie pour la formulation des bétons secs à démoulage immédiat

Abstract : Construction’s sector is knowing an important mutation and is confronted with unpresented stakes with major importance for next decades: population growth and needs in accommodation and infrastructures, climate change, uses of durable and natural resources, societal expectations from consumers as well as territorial’s stakeholders. Concrete precast industry is strongly enlisted to answer at these news needs, for the constructive systems proposed as well as for the production processes of concrete’s products. The stake is especially important for concrete masonry units with a production in France in 2017 of 6.7 million tons. These products are realized using press which compact concrete with vibration and pression. Blocs are made of dry cast concrete with average air content between 7 and 15%. Today, formulation methodologies are adapted to delayed demoulding products and so not made for bloc concrete.This thesis aims to develop a formulation methodology adapted to blocs and to their process, in order to optimize their performances in economic conditions. This implies disposing of robust tools able to determine optimal proportions for each constituent, considering process specifications. Especially, it is necessary to use an optimized aggregates mix.The formulation methodology developed runs through two steps. The first one consists in choosing the aggregates mix with maximal packing density. The second one determines other constituents volumes (cement, efficient water, air and addition) according to consistency and mechanical performances requirements. The compressive packing model (F.de Larrard) is adapted to dry aggregates mix casting with vibrating press in a bloc mold. Results also make it possible to connect fresh and hardened properties to the formulation of dry cast concretes. Solving the system of equations gives the formulation optimizing the ratio costs/performances.
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Laure Abdul Le Brun. Mise au point d’une méthodologie pour la formulation des bétons secs à démoulage immédiat. Génie civil. Université Montpellier, 2018. Français. ⟨NNT : 2018MONTS035⟩. ⟨tel-02094277⟩

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