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Etude des propriétés thermiques et mécaniques des bétons isolants structurels incorporant des cénosphères

Abstract : In the field of building thermal insulation, regulatory (RT2012) and standards (NF BPE: Béton à Propriétés Thermiques, September 2016) evolutions are encouraging the use of insulating structural concrete (BIS). The control of their thermal conductivity is essential. It is possible, in addition to using lightweight aggregates, to modify the composition of the cement paste by using hollow inclusions (fly ash cenospheres) to bring an additional thermal insulating potential. In a context of improved workability, to these properties is added the criterion of self-compacting concrete. The validation of these new formulas required the characterization of materials at different scales (from inclusion scale to building scale) by implementing experimental and numerical approaches. Their properties at fresh and hardened state were analyzed. The measured thermal conductivities place these new concretes in the Category of Structural Insulating Concrete in the sense of the new standard. The developed numerical model allowed approaching the experimental measurements correctly. The effect of cenospheres’ incorporation into cement paste on several durability indicators was also characterized.
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Submitted on : Friday, April 12, 2019 - 12:03:07 PM
Last modification on : Tuesday, October 20, 2020 - 11:02:30 AM

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Siyimane Mohaine. Etude des propriétés thermiques et mécaniques des bétons isolants structurels incorporant des cénosphères. Génie civil. École centrale de Nantes, 2018. Français. ⟨NNT : 2018ECDN0030⟩. ⟨tel-02097989⟩

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