Effects of Seawater, NaCl, and Solution Mixing on Hydration Process of Cement Paste
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 5
Abstract
The use of seawater as mixing water for concrete production is one of the most efficient strategies to solve freshwater shortage problems. The purpose of this paper is to investigate the effects of seawater mixing on hydration, microstructure, and strength development of cement pastes. Multiscale tests were used for cement pastes mixed with seawater, NaCl, and solutions, respectively. The chloride ions in seawater increased the hydration degree during the process for nucleation and crystal growth and shortened the period for phase boundary reactions as a dominant process. At the age of 28 days, ettringite and Friedel’s salt coexisted for the seawater mixing paste, whereas the ettringite almost disappeared for the deionized water mixing. The seawater mixing led to a less porous cement matrix with much finer pores. Furthermore, seawater mixing enhanced the compressive strength and bending strength at early ages but later the enhancement decreased with curing time. in the seawater enhanced the strength of the cement paste before 1 day but later inhibited the strength development.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by reasonable request.
Acknowledgments
This work was supported by Shenzhen City Science and Technology Project (Grant Nos. JCYJ20170818100641730 and JCYJ20180305124008155); Shenzhen International Cooperation Research Project (Grant No. GJHZ20180928155602083); the National Natural Science Foundation (Grant No. 51808346); and the New Faculty Start-Up Research Project of Shenzhen University (Grant No. 2018024).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 5 • May 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 17, 2020
Accepted: Sep 16, 2020
Published online: Feb 22, 2021
Published in print: May 1, 2021
Discussion open until: Jul 22, 2021
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