The influence of triethanolamine (TEA) at varying dosages on the strength development of pure cement (PC) and fly ash cement (FAC) pastes was systematically investigated. Techniques including mercury intrusion porosimetry, X-ray diffraction, thermogravimetric analysis and scanning electron microscopy were employed to characterise the microstructure of hardened cement pastes and to monitor the cement hydration process with the aim of correlating strength variations with microstructural changes caused by TEA addition. The results showed that 0·03–0·10% addition of TEA visibly enhances the early strength but decreases the compressive strength after 3 d for PC pastes. A high dosage of TEA (1%) leads to a sharp decrease in 28-d strength for both PC and FAC pastes. Mechanistic explanations regarding why TEA affects the strength development differently at different dosages and ages are discussed by considering the impacts of TEA on the hydration degree, pore structure, composition and morphology of hydration products.
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1 September 2013
Research Article|
July 31 2013
Influence of triethanolamine on the hydration and the strength development of cementitious systems
Xiang-Ming Kong;
Xiang-Ming Kong
Associate Professor, Key Laboratory of Civil Engineering Safety and Durability, China Education Ministry Department of Civil Engineering, Tsinghua University, Beijing, China
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Zhen-Bao Lu;
Zhen-Bao Lu
Master Researcher, Beijing Building Construction Research Institute Co. Ltd, Beijing, China
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Hui Liu;
Hui Liu
Postgraduate Researcher, Department of Chemical Engineering, China University of Mining & Technology, Beijing, China
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Dong-Min Wang
Dong-Min Wang
Professor, Department of Chemical Engineering, China University of Mining & Technology, Beijing, China
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Publisher: Emerald Publishing
Revision Received:
January 08 2013
Revision Requested:
June 19 2013
Accepted:
June 20 2013
Online ISSN: 1751-763X
Print ISSN: 0024-9831
ICE Publishing: All rights reserved
2013
Magazine of Concrete Research (2013) 65 (18): 1101–1109.
Article history
Revision Received:
January 08 2013
Revision Requested:
June 19 2013
Accepted:
June 20 2013
Citation
Kong X, Lu Z, Liu H, Wang D (2013), "Influence of triethanolamine on the hydration and the strength development of cementitious systems". Magazine of Concrete Research, Vol. 65 No. 18 pp. 1101–1109, doi: https://doi.org/10.1680/macr.13.00015
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