Effect of Internal Water Pressure on the Measured Coefficient of Thermal Expansion of Concrete
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 4
Abstract
A study was conducted to evaluate the effect of coefficient of thermal expansion (CTE) test procedures and length-change measuring devices on the measured CTE values. Twenty different coarse aggregate sources were tested using the Texas Department of Transportation (TxDOT) and the American Association of State Highway and Transportation Officials (AASHTO) suggested CTE methods. Two different types of length-change measuring devices, linear variable differential transformers (LVDTs) and differential variable reluctance transducers (DVRTs), were used. No significant effects of length-change measuring devices were observed on the CTE values measured by the TxDOT method. However, the test methods have shown effects on the measured values. The TxDOT method yields higher CTE values than the AASHTO method. Data obtained in this study confirmed that the internal water pressure development during the heating and cooling cycles is one of the potential reasons. Internal water pressure can significantly affect the CTE of concrete. Further investigation is needed to determine the effect of internal water pressure on the CTE, which affects the design and service life of concrete pavements.
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Acknowledgments
The authors wish to acknowledge the support from the Construction Materials Research Group of the University of Texas at Austin. They particularly acknowledge David Whitney and Michael Rung for their help, support, and ideas throughout this study.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 4 • April 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 4, 2013
Accepted: Apr 3, 2014
Published online: Jul 25, 2014
Discussion open until: Dec 25, 2014
Published in print: Apr 1, 2015
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