FraMCoS 4 2001 Cachan, France

Effectofcrackingduetothermaltreatmentincement-basedmaterialsonchloride diffusion andgaspermeabilityprocesses

In this paper, the real microstructure of the concrete is taken into account, particularly cracking obtained by thermal treatment. Our experimental studies aim at determining the influence of cracking state on transport by chloride diffusion and gas permeability processes and…

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Year 2001
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Abstract

In this paper, the real microstructure of the concrete is taken into account, particularly cracking obtained by thermal treatment. Our experimental studies aim at determining the influence of cracking state on transport by chloride diffusion and gas permeability processes and at linking these transport properties to mi- crostructure (cracking and porosity). The studied materials are two cement pastes (W/C=0.35 and 0.45). The chloride diffusion and gas permeability tests are performed on cracked and uncracked materials. The thermal treatment allows us to induce localized microcraking characterized by width of hundred micrometers. Our re- sults show that the transport properties are modified by thermal treatment. But these modifications may be ex- plained by the modification of the porosity and the cracking has little influence on the transport properties.