Pore structure of hydrating cement paste by magnetic resonance relaxation analysis and freezing

被引:110
作者
Jehng, JY
Sprague, DT
Halperin, WP
机构
关键词
NMR; cement hydration; freezing; porous media;
D O I
10.1016/S0730-725X(96)00164-6
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Nuclear magnetic resonance relaxation analysis has been applied to interpret the evolution of microstructure in a cement paste during hydration, ii basic understanding of the wet-dry and freeze-thaw processes of cement pastes has been developed, The pore structure evolution has been studied by the suppression of the freezing temperature of water and compared with spin-spin relaxation analysis performed at room temperature, Both methods consistently show that hydrating cement pastes have two principal components in their size distribution, The NMR relaxation times provide a measure of the characteristic pore sizes, Their interpretation is made in the context of a fast exchange model. Supercooling and thawing point depression of confined water has been studied systematically, The depression of the freezing point of liquid water confined within a pore was found to be dependent on the pore size, with capillary pore water freezing at 240 K and the remaining gel pore water freezing over a temperature range extending to as low as 160 K, A modified Gibbs-Thompson analysis was used to determine pore volume distributions from the distribution of thawing temperatures. Copyright (C) 1996 Elsevier Science Inc.
引用
收藏
页码:785 / 791
页数:7
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