Finite-Element Simulation of Hydration and Creep of Early-Age Concrete Materials
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 11
Abstract
The thermal stress and tensile creep of early-age concrete that occur during the exothermic chemical reactions between water and cement may result in harmful cracks. Heat of hydration and creep of early-age concrete are described in this paper. An equation for evaluating hydration degree is presented, and a finite-element program for a thermal analysis of hydration heat is developed. Based on the theory of creep and heat of hydration of early-age concrete, the temperature and strains in a subway station structure were simulated using the finite element method. The predicted results are in good agreement with the site-measured data. A parametric analysis of ambient temperature and concrete slab thickness was also conducted. The analysis results indicate that it is not advantageous to reduce the temperature difference, whether the ambient temperature is too high or too low. Creep does not always reduce the undesirable tensile stresses; it may increase structural tensile stresses during the early-age stage of concrete.
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Acknowledgments
This research is financially supported by the National Natural Science Foundation of China under grant number 51008011, the China Scholarship Council under the grant number 201206025022, and the National Key Technology R&D Program of the Ministry of Science and Technology of the People’s Republic of China under the grant number 2006BAJ27B02.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 11 • November 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 1, 2013
Accepted: Apr 14, 2014
Published online: Jun 18, 2014
Published in print: Nov 1, 2014
Discussion open until: Nov 18, 2014
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