Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 294, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.123528
Keywords
Hydration; Portland cement; Sulphate; Calcium aluminoferrite; Triethanolamine
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Funding
- German Research Foundation (DFG) [SPP 2005, 387092747]
- German Federal Ministry of Education and Research (BMBF) [FKZ: 03XP0122A]
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The hydration of cements containing different sulphate carriers, namely gypsum, hemihydrate, and anhydrite, was investigated with and without triethanolamine. The presence of triethanolamine significantly affects the hydration process by increasing the initial dissolution of aluminates, leading to an increase in aluminium species in solution, and substantial retardation of C3S hydration. Hemihydrate can suppress this impact due to its high dissolution rate.
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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