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

Journal Article · Tue Jul 01 04:00:00 EDT 2003 · Cement and Concrete Research

DOI:https://doi.org/10.1016/S0008-8846(03)00005-X· OSTI ID:20658314

Farage, M C.R.; Sercombe, J; Galle, C

This paper is concerned with the evolution of the microstructure of cementitious materials subjected to high temperatures and subsequent resaturation 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) are presented concerning the evolution of the pore network of ordinary portland cement (OPC) paste heated at temperatures varying between 80 and 300 deg. C. The consequences of heating on the macroscopic properties of cement paste are evaluated by measures of the residual gas permeabilities, elastic moduli and Poisson's ratio, obtained by nondestructive methods. Resaturation by direct water absorption and water vapour sorption are 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 deg. C.

• OSTI ID: 20658314
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 7 Vol. 33; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
ADSORPTION
DEHYDRATION
HEATING
MECHANICAL PROPERTIES
MERCURY
MICROSTRUCTURE
PERMEABILITY
PORTLAND CEMENT
RADIOACTIVE WASTES
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
WATER VAPOR