Properties of Different Pumice Grades Blended with Cement
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 7
Abstract
The research focused on determining the effect of fresh and hardened properties of paste, mortar, and concrete using high Si-Al-Na–containing pumice as a supplementary cementitious material. Three crushed and sieved powder grades of this pumice were investigated at different percentages of cement replacement, up to 30%. Of the fresh properties, hydration kinetics from a calorimeter showed lower heat of hydration, and Vicat setting times indicated slower hardening response with the increased addition of pumice of the same grade. The finer grades of pumice showed reduced compressive strength compared to the control mixture, but enhanced strength compared to coarser grades. Durability tests of mortar samples were also performed. The addition of pumice and the finer grades of pumice showed enhanced resistance against both sulfate attack and alkali–silica reaction. A replacement of cement by 15% regardless of coarseness of the pumice grade was sufficient to prevent alkali–silica reaction.
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Acknowledgments
The authors thank Hess Pumice for financial support and for providing pumice materials for this research. They would also like to thank Todd Laker of LafargeHolcim Cement for analyzing the cements and pumice materials in their XRF.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 7 • July 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jun 17, 2016
Accepted: Nov 16, 2016
Published ahead of print: Mar 27, 2017
Published online: Mar 28, 2017
Published in print: Jul 1, 2017
Discussion open until: Aug 28, 2017
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