The influence of alkali-free and alkaline shotcrete accelerators within cement systems I.: Characterization of the setting behavior

被引：103
|
作者：
Paglia, C
Wombacher, F
Böhni, H
机构：
[1] SIKA AG, Cent R&D, Admixture Dept, CH-8048 Zurich, Switzerland
[2] Swiss Fed Inst Technol, Inst Mat Chem & Corros, CH-8093 Zurich, Switzerland
来源：
CEMENT AND CONCRETE RESEARCH | 2001年 / 31卷 / 06期
关键词：
accelerators; setting; ettringite; microstructure;
D O I：
10.1016/S0008-8846(01)00509-9
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The influence of alkali-free and alkaline accelerators on the setting behavior of cementitious mixtures is investigated. The aluminium sulfate present in the alkali-free accelerators promotes the crystallization of ettringite prisms (2-7 mum) between the clinkers, thus connecting them in a compact mass and accelerating the setting. The very rapid setting promoted by the addition of the alkali KAl(OH)(4)-rich admixture is mainly the result of the precipitation of CH plates and amorphous KCASSH hydrates. In this case, the crystallization of elongated ettringite rods contributes to a smaller extent to the setting. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：913 / 918
页数：6
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