Effect of calcium lignosulfonate on the hydration of the tricalcium aluminate-anhydrite system

被引：25

作者：

Wang, Xiaoping ^{[1
]}

Pang, Yuxia ^{[1
]}

Lou, Hongming ^{[1
]}

Deng, Yonghong ^{[1
]}

Qiu, Xueqing ^{[1
]}

机构：

[1] S China Univ Technol, Sch Chem & Chem Engn, State Key Lab Pulp & Paper Engn, Guangzhou, Guangdong, Peoples R China

来源：

CEMENT AND CONCRETE RESEARCH | 2012年 / 42卷 / 11期

基金：

美国国家科学基金会;

关键词：

Calcium lignosulfonate; Ca3Al2O6; Hydration; Ettringite; CEMENT;

D O I：

10.1016/j.cemconres.2012.08.008

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

As a plasticizer and retarder, calcium lignosulfonate (CL) frequently leads to quick set of Portland cement containing anhydrite. For exploring the cause of this problem, the hydration characteristics of the tricalcium aluminate-anhydrite system in the saturated calcium hydroxide solution with and without CL were researched from two aspects: the compositions of liquid phases and the formations of hydration products. Results show that the CL can promote the formation of ettringite, which induces a significant decrease in sulfate ion concentration at the initial time of hydration. The size of ettringite crystals becomes large in the presence of Cl., which seems to be related to a decrease in calcium sulfate saturation ratio. It can be deduced that the quick set in the presence of CL is mainly caused by the accelerated reaction between the tricalcium aluminate and the anhydrite at the initial time of hydration. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：1549 / 1554

页数：6

共 14 条

[1]

Aitcin Pierre-Claude, 1994, CONCR INT, V16, P45

[2]

Dodson V.H., 1989, Cement, Concrete and Aggregates, V11, P52, DOI 10.1520/CCA10102J

[3]

He E. Z., 1983, SILIC CONSTR PROD, V2, P38

[4]

Hu X. C., 1987, IND CONSTR, V8, P33