Delayed ettringite formation: The effect of temperature and basicity on the interaction of sulphate and C-S-H phase

被引：116

作者：

Divet, L ^{[1
]}

Randriambololona, R ^{[1
]}

机构：

[1] Lab Cent Ponts & Chaussees, Serv Physicochim Mat, F-75732 Paris 15, France

来源：

CEMENT AND CONCRETE RESEARCH | 1998年 / 28卷 / 03期

关键词：

D O I：

10.1016/S0008-8846(98)00006-4

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The aim of this work was to learn more about the role of C-S-H phase in delayed ettringite formation. Some authors assume that, when the temperature of a concrete rises during setting, sulphates are trapped by physical adsorption on C-S-H. The sulphates are then likely to lead, in the long term, to the formation of ettringite. Our work clearly shows that the adsorption capacity of sulphate ions is high and is directly related to the basicity of the pore solution of the concrete and to the temperature of the heat treatment: a higher pH and temperature favour adsorption. The adsorption isotherm can be described by a Langmuir model. Finally, the reversibility of the adsorption has also been confirmed. (C) 1998 Elsevier Science Ltd.

引用

页码：357 / 363

页数：7

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