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Mise au point d'une méthodologie pour formuler de nouveaux bétons auto-plaçants légers et durables

Latifou Bello 1
1 Pôle MSGC - Pôle Matériaux et Structures du Génie Civil
C2MA - Centre des Matériaux des Mines d'Alès
Abstract : Self compacting concrete (SCC) is generally known as the concrete capable of filling up the given structure only using its self weight without any need for vibration and compaction during pouring process. On the other hand, the structural lightweight concrete (LWC) has emerged due to its lightness and all the advantages related to lower thermal insulating characteristics. The two materials open way to the lightweight self compacting concrete (LWSCC) in order to combine the favorable properties of LWC with those of SCC.However, the difference in density between the lightweight aggregate and cement paste complicate the mix design and production of LWSCC. Furthermore, existing mix design methods which are mostly borrowed from SCC design methods are empirical. Therefore, this thesis aims to develop a rational mix design method for suitable lightweight self-compacting concrete. This approach is built around a set of coherent data whose compaction index of granular skeleton and on the experimental data such as water absorption in the cement paste and segregation. From this method, different ranges of LWSCC are proposed to meet the requirements of the specification in terms of dry density and compressive strength. Its implementation was used to simulate and formulate LWSCC of workability classes from SF1 to SF3, density class from D1.8 to D2.0 and resistance class from LC35/38 to LC50/55. The mix design method also explored the total lightweight self compacting concrete (TLWSCC) that may constitute an innovative solution for the concrete industry in the context of the new thermal regulations for buildings
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Latifou Bello. Mise au point d'une méthodologie pour formuler de nouveaux bétons auto-plaçants légers et durables. Génie civil. Université Montpellier II - Sciences et Techniques du Languedoc, 2014. Français. ⟨NNT : 2014MON20137⟩. ⟨tel-01683251⟩

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