Role of disjoining pressure in cement based materials

被引：104

作者：

Beltzung, F ^{[1
]}

Wittmann, FH

机构：

[1] Aedificat Inst, D-79110 Freiburg, Germany

[2] Qingdao Univ Technol, Qingdao, Peoples R China

来源：

CEMENT AND CONCRETE RESEARCH | 2005年 / 35卷 / 12期

关键词：

shrinkage; pore solution; surface layer; disjoining pressure; calcium-silicate hydrate;

D O I：

10.1016/j.cemconres.2005.04.004

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

During the hydration process of Portland cement a nanoporous gel is formed. The high internal surface of the hydration products, mainly calcium-silicate hydrates, and the numerous adsorbed cations interact with water. At an equilibrium moisture content below 50% adsorbed water molecules reduce the surface tension of the solid particles. Water adsorbed at higher relative humidity is at the origin of disjoining pressure acting in small gaps between particles. Both processes are major mechanisms of shrinkage and swelling of hardened cement paste. Results of investigations into the disjoining pressure are summarised. The relevance of disjoining pressure for the behaviour of cement-based materials will be discussed. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：2364 / 2370

页数：7

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