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Influence of Hydrate Dissolution by Water on the Young s Modulus of Cement-Based Materials

Published

Author(s)

S Kamali, M Moranville, Edward Garboczi, S Prene, B Gerard

Abstract

Leaching of concrete by water may severely damage structures like radioactive waste depositories or water supply stations. This paper presents the influence of water leaching on the mechanical properties of cement pastes. The NIST microstructure model CEMHYD3D and elastic model ELAS3D were used to quantify the effect of the dissolution of cement hydrates like calcium hydroxide (CH), monosulphoaluminate (AFm) and ettringite (AFt), on the Young s modulus. The results clearly indicate the important impact of the calcium hydroxide dissolution on the decrease of this parameter. Calcium hydroxide leaching can reduce the Young s modulus by more than 50 %, depending on the initial calcium hydroxide content. Different cement pastes were simulated to investigate the effect of two parameters: water to cement ratio and silica fume addition. An empirical equation relating the reduction of capillary porosity to that of the Young s modulus was developed.
Citation
International Conference on Fracture Mechanics of Concrete and Concrete Structures

Keywords

cement, dissolution, ettringite, hydrates, leaching, microstructure, monosulfoaluminate, porosity, portlandite

Citation

Kamali, S. , Moranville, M. , Garboczi, E. , Prene, S. and Gerard, B. (2021), Influence of Hydrate Dissolution by Water on the Young s Modulus of Cement-Based Materials, International Conference on Fracture Mechanics of Concrete and Concrete Structures (Accessed December 3, 2021)
Created October 12, 2021