Influence of Clinker Replacement and Curing Temperature on Hydration Kinetics, Strength Development, and Phase Assemblage of Fly Ash–Blended Cements
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 6
Abstract
The influence of clinker replacement on temperature sensitivity of fly ash–blended cements was investigated at three realistic temperatures. Blends were prepared by replacing clinker with fly ash or quartz at two replacement levels of 30% and 45%. The rate of hydration of slow-reacting clinker phases, especially belite, reduced in fly ash systems at higher temperatures. At lower replacement levels, this reduction in clinker hydration is compensated by an increase in the pozzolanic activity. However, in high-volume fly ash blends, apart from reduced clinker hydration, and the reduction in pozzolanic reaction due to lower portlandite precipitation, it leads to lower strength development at later ages at higher temperature. While the same level of quartz replacement does not influence belite hydration, it indicates that the main hydration product, calcium silicate hydrate (C-S-H), formed at 50°C in fly ash blends might be different from that of ordinary portland cement (OPC) or quartz blends, and influences the further hydration of clinker.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors acknowledge the financial support from the Swiss Agency for Development and Cooperation (SDC) for carrying out this work.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 6 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 12, 2020
Accepted: Oct 20, 2021
Published online: Mar 23, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 23, 2022
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