期刊
CEMENT AND CONCRETE RESEARCH
卷 39, 期 6, 页码 473-481出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2009.03.006
关键词
Hydration (A); Degree of hydration (B); Silica fume (D); Porosity; Vitreous calcium aluminosilicate; Non-evaporable water content
资金
- Center for Advanced Materials Processing (CAMP) at Clarkson University
The influence of a relatively new high-performance cement replacement material-vitreous calcium aluminosilicate (VCAS)-on the hydration behavior in cementitious systems, and its comparison to silica fume (SF) are presented in this paper. WAS is shown to have no cementitious qualities, but exhibits significant pozzolanicity, which has been quantified using strength activity index and electrical conductivity change. WAS modified pastes are found to consume more water during hydration than the corresponding SF modified pastes. Based on a normalized calcium hydroxide content defined in this paper, it is seen that the pozzolanic reaction of WAS does not happen until 7 days while that of SF occurs as early as the first day. The degrees of hydration of the modified pastes are predicted using a model that employs the change in non-evaporable water resulting from the use of these replacement materials. WAS modified pastes show lower later age porosities as compared to the plain and SF modified pastes. However, at equal degrees of hydration, SF modified pastes show the lowest porosity. (c) 2009 Elsevier Ltd. All rights reserved.
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