Rehydration and microstructure of cement paste after heating at temperatures up to 300 C


The microstructural evolution of cementitious materials subjected to high temperatures and subsequent resaturation was studied in the particular context of long-term storage of radioactive wastes, where diffusive and convective properties are of primary importance. Experimental results obtained by mercury intrusion porosimetry (MIP) on the evolution of the pore network of OPC paste heated at temperatures between 80 and 300 C are presented. The consequences of heating on the macroscopic properties of cement paste were evaluated by measuring the residual gas permeabilities, elastic moduli and Poisson's ratio, obtained  by nondestructive methods. Resaturation by direct water absorption and water vapour sorption were used to estimate the reversibility of dehydration. The results provide some evidence of the self-healing capacity of resaturated cement paste after heating at temperatures up to 300 C.  37 refs.

Primary author(s): Farage M C R; Sercombe J; Galle C

                            Conselho Nacional de Desenvolvimento Cient.Tecnol.; CEA Saclay

Source: Cem.Concr.Res.


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