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Effets du chauffage sur les matériaux cimentaires - impact du « self-healing » sur les propriétés de transfert

Abstract : This experimental work focused on the degradation of two cementitious materials, mortar (for most tests) and a concrete following an intense heating to 600 ° C and 700 ° C sometimes. The idea that underpinned the study was to "measure" this degradation via the transport properties : gas permeability and porosity to gas under confining stress and some poro-mechanical properties. To carry out this work, several experimental techniques have been developed or improved. This is particularly the porosity measurement gas under a confining stress. The use of a neutral gas is used to fill the voids in the material and connected to calculate its porosity. Rehydration with demineralized water has a considerable effect on the highly heated material because it restores much of the porosity which regains its initial level or sometimes a value less than one. Logically the "self-healing" also restores much of the permeability which does not recover its original level
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Yan Pei. Effets du chauffage sur les matériaux cimentaires - impact du « self-healing » sur les propriétés de transfert. Génie civil. Ecole Centrale de Lille, 2016. Français. ⟨NNT : 2016ECLI0016⟩. ⟨tel-01491030⟩

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