Determination of Apparent Activation Energy of Concrete by TMC and Mathematical Means
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 2
Abstract
This paper presents a novel procedure to determine the apparent activation energy () of concrete by temperature-matched curing (TMC) and a mathematical approach in which a TMC system is designed and finite-element software is used. The mathematical approach is adopted to analyze energy by minimizing the difference between the predicted values and measured data from testing samples cured under TMC conditions. Two methods are proposed to select the best-fit value of ( for specified age and for testing ages ranging from the first testing age to age ). The results show that the value of is strongly age-dependent and nonlinear. decreases remarkably after a critical age, whereas varies smoothly with age. The value of is related to the temperature history. The procedure to determine presented in this paper fully takes into account the temperature effects on cementitious materials, and practicality and accuracy are greatly improved.
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Acknowledgments
The work presented in this paper was funded by Project 863 “Super High-Rise Building Construction Condition Monitoring and Reliability Control Technology” (2009AA04Z420).
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Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 2 • February 2013
Pages: 289 - 295
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 18, 2011
Accepted: May 23, 2012
Published online: May 26, 2012
Published in print: Feb 1, 2013
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