Temperature-Dependent Hydration and Mechanical Properties of High-Volume Fly Ash Cement with Chemical Additives
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 5
Abstract
This research investigates the effects of and on the mechanical and hydration properties of high-volume fly ash (FA) cement (HFC) at three curing temperatures: 25°C, 40°C, and 60°C. Setting time, compressive strength, reaction kinetics, phase assembles, and pore structure were explored. The research found that the hydration of HFC was significantly promoted by the chemical activators at all temperatures. At 25°C, the incorporation of and decreased the initial setting time by 59% and 50%, respectively, compared to the control sample. This was accompanied by increased heat release from the isothermal calorimetry tests. At the same time, the introduction of (HFC-C) increased the early compressive strength by 40%, higher than that of samples with addition (HFC-S). While reduced compressive strength was noticed in HFC-C after curing for a long time, resulting from the increased porosity. Furthermore, temperature rise reduced the contribution index (Ci) to the strength development of both HFC-C and HFC-S. On the other hand, the presence of contributed to the formation of more ettringite (AFt), while no AFt was detected after the addition of . Increasing the curing temperature did not strongly change the phase assembles of the hydration products, although the amount of AFt content was observed to increase.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
The authors gratefully acknowledge the financial support from National Natural Science Foundation of China, 51774066; Research and Development Project, Liaoning, 2020JH1/10300005; The Fundamental Research Funds for the Central Universities, N2001024; Innovation Program for College Students, Northeastern University, 200060.
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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: May 6, 2020
Accepted: Sep 22, 2020
Published online: Feb 24, 2021
Published in print: May 1, 2021
Discussion open until: Jul 24, 2021
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