Cementitious characteristics of hydrated cement paste subjected to various dehydration temperatures

This paper emphasizes on studying the cementitious characteristics and the relative rehydration capability of dehydrated cement paste (DCP). Several specimens of DCP were firstly prepared, respectively after pre-heating the powders of hydrated cement paste (HCP) at different temperatures ranging from 300 degrees C to 900 degrees C. The cementitious properties of each DCP were then evaluated by the required water of standard consistency, setting time, degree of rehydration, compressive strength development and microstructure evolution. The experimental results show that DCP has highly required water of standard consistency, short setting time and rapid rehydration rate compared with ordinary Portland cement, and also indicate that the rehydration capacity of DCP is influenced by the dehydration temperature. (C) 2007 Elsevier Ltd. All rights reserved.