Effect of Chemical Admixtures on Apparent Activation Energy of Cementitious Systems
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 12
Abstract
The Arrhenius equation is often used to characterize the progress of portland cement hydration for predicting in-place concrete temperature, strength, and other properties. To apply the Arrhenius equation, an activation energy () value representing the temperature sensitivity of the hydration reactions must be determined. The effects of concrete mixture variables on activation energy, including the effects of chemical admixtures, have not been well researched. This paper examines the effects of set-accelerating, water-reducing/set-retarding, and air-entraining admixtures on apparent (i.e., experimentally determined) activation energy for mixtures with and without supplementary cementitious materials. It was found that a glucose-based water-reducing retarder and two high-range water-reducing admixtures slightly lowered , a lignosulfonate-based water-reducing retarder and a calcium nitrate–based set-accelerating admixture significantly lowered , and a vinsol resin air-entraining agent had no effect.
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Acknowledgments
The writers would like to thank the Texas Department of Transportation and project director Ralph Browne for their support under project UNSPECIFIED0-4563, Prediction Model for Concrete Behavior. The writers would also like to acknowledge Racheal Lute and Paul Warfield for their assistance with isothermal calorimetry testing.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 12 • December 2011
Pages: 1654 - 1661
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Sep 3, 2010
Accepted: Jun 17, 2011
Published online: Jun 21, 2011
Published in print: Dec 1, 2011
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