The influence of sodium and potassium hydroxide on volume changes in cementitious materials

被引：68
作者：
Sant, Gaurav [1 ,2 ]
Kumar, Aditya [1 ]
Patapy, Cedric [3 ]
Le Saout, Gwenn [4 ]
Scrivener, Karen [3 ]
机构：
[1] Univ Calif Los Angeles, Dept Civil & Environm Engn, Lab Chem Construct Mat, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Calif Nanosyst Inst CNSI, Los Angeles, CA USA
[3] Ecole Polytech Fed Lausanne, Lab Construct Mat, Lausanne, Switzerland
[4] Ecole Mines Ales, CMGD, Ales, France
来源：
CEMENT AND CONCRETE RESEARCH | 2012年 / 42卷 / 11期
关键词：
Alkalis; Shrinkage; Drying; Compressive strength; Humidity; SHRINKAGE-REDUCING ADMIXTURES; EARLY-AGE; AUTOGENOUS DEFORMATIONS; MECHANICAL-PROPERTIES; PORTLAND-CEMENT; KILN DUST; PERFORMANCE; HYDRATION; ALKALI; PASTES;
D O I：
10.1016/j.cemconres.2012.08.012
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This research investigates the influence of alkali hydroxides on unrestrained volume changes. A detailed multi-method approach is used to characterize the progress of cement hydration, autogenous and drying volume changes (i.e., shrinkage), autogenous RH decrease, compressive strength development, solid and liquid phases and the pore structure. It is noted that under autogenous conditions, alkalis magnify shrinkage; while upon external drying the extent of shrinkage is more similar. This is contrary to expectations which suggest that the reduction in the water activity and the negative pressure developed in the liquid phase, produced by alkali enrichment, should reduce shrinkage. Analysis of the autogenous RH decrease, pore solution chemistry and the mechanical properties indicates that the bulk shrinkage response is linked to multiple parameters including: (1) increased self-desiccation at early ages, (2) a reduction in the strength (and stiffness) of alkali-enriched systems and (3) liquid saturation effects. (C) 2012 Elsevier Ltd. All rights reserved.
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收藏
页码：1447 / 1455
页数：9
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