Preparation of alkali-free liquid accelerator based on aluminum sulfate and its accelerating mechanism on the hydration of cement pastes

被引：75
作者：
Niu, Mengdie [1 ]
Li, Guoxin [1 ]
Zhang, Jiangbo [1 ]
Cao, Li [2 ]
机构：
[1] Xian Univ Architecture & Technol, Sch Mat Sci & Engn, Xian, Peoples R China
[2] Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Xian, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 253卷
关键词：
Aluminum sulfate; Alkali-free liquid accelerator; Setting time; Compressive strength; Hydration reaction; EARLY AGE HYDRATION; SHOTCRETE ACCELERATORS; ADMIXTURES; STRENGTH; PERFORMANCE; DURABILITY; MATRICES; SYSTEMS;
D O I：
10.1016/j.conbuildmat.2020.119246
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The alkali-free liquid accelerator based on aluminum sulfate (F-AS-AF accelerator) was prepared and its effects on the setting time and compressive strength of cement, C(3)A and C3S were studied. The accelerator mechanism was investigated via XRD and TG. Results showed that the F-AS-AF accelerator shortened the setting time, and enhanced the early and later compressive strength of cement. With the addition of F-AS-AF accelerator, Al(3+ )reacted with Ca2+ and SO42 in the C(3)A to rapidly form ettringite, and the consumption of Ca2+ further promoted the dissolving and hydration of C3S. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：10
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