Effect of different sulphate carriers on Portland cement hydration in the presence of triethanolamine

被引：34
作者：
Hirsch, Tamino [1 ]
Lu, Zichen [1 ]
Stephan, Dietmar [1 ]
机构：
[1] Tech Univ Berlin, Dept Civil Engn, D-13355 Berlin, Germany
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 294卷
关键词：
Hydration; Portland cement; Sulphate; Calcium aluminoferrite; Triethanolamine; DIGITAL FABRICATION; AQUEOUS-SOLUTIONS; CALCIUM-SULFATE; CARBON-DIOXIDE; EARLY AGE; TRICALCIUM; WATER; MICROSTRUCTURE; DEHYDRATION; TEMPERATURE;
D O I：
10.1016/j.conbuildmat.2021.123528
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Hydration of cements containing different sulphate carriers, namely gypsum, hemihydrate and anhydrite was investigated with and without triethanolamine. It is found that the hydration of different cements is similar without triethanolamine, but differs significantly with it, which is related to the dissolution rate of sulphate carriers. The initial dissolution of the aluminates is increased by triethanolamine, and the comparatively slow dissolution of anhydrite cannot provide sufficient sulphate to compensate for this enhanced dissolution. This results in an increase of the aluminium species in solution and substantial retardation of C3S hydration. Hemihydrate can suppress this impact due to its high dissolution rate. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：13
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