Effect of Cement Type and Water-to-Binder Ratio on -value of Low-Calcium Fly Ash for Concrete Compressive Strength
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 11
Abstract
The present study assessed the effect of cement type and water-to-binder ratio (W/B) on the cementing efficiency factor (-value) of low-calcium fly ash (FA) for the compressive strength of concrete in a chemical approach. The results indicated that the -values increased with an increase in the FA reaction degree for each cement type. Despite the higher FA reaction degree in high-early-strength Portland cement (HSPC) paste, the -value in the HSPC concrete was lower than that in OPC (ordinary Portland cement) concrete. For OPC concrete, a lower W/B has a higher -value at the early ages mainly because of cement hydration that is enhanced by FA, and all the -values increased significantly after 28 days due to the pozzolanic reaction of FA. A modified equation of portlandite consumption for the FA reaction assessment that considers the cement-hydration-enhancement effect was proposed to assess the FA reaction degree more appropriately than the conventional one.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors are grateful to Mr. Yuki Miyoshi, former master’s student, and other students of the Structural Materials and Concrete Structures Laboratory of Hiroshima University for their assistance during the experimental campaign. This research was partially supported by JSPS KAKENHI Grant, Grant-in-Aid for Young Scientists (B) No. JP17K14708.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 11 • November 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Sep 7, 2022
Accepted: Apr 21, 2023
Published online: Sep 5, 2023
Published in print: Nov 1, 2023
Discussion open until: Feb 5, 2024
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