Damage Constitutive Model of Fly Ash Concrete under Freeze-Thaw Cycles
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 9
Abstract
The mechanical deterioration of concrete exposed to freeze-thaw cycles is one of the most important durability problems under subzero temperature conditions. At present, studies on concrete behavior under freeze-thaw cycles primarily focus on the degradation of concrete properties, there are few reports on testing and modeling the stress-strain relationships of concrete undergoing repeated cycles of freeze-thaw. This paper investigated the stress-strain relationship of fly ash concrete under 0, 5, 15, 30, 50, 75, 100, and 125 freeze-thaw cycles by testing 24 prism specimens. The relative dynamic modulus, compressive strength, elastic modulus, and stress-strain relationship of specimens under freeze-thaw cycles were measured. In addition, a multiple sharp degradation point model for the degradation of mechanical properties of concrete was proposed. Finally, a damage constitutive model on the base of the damage mechanics and the multiple sharp degradation point model was presented. By comparing the results calculated by the damage constitutive model with the experimental data, the proposed model was proved to be effective for evaluating the stress-strain relationship of fly ash concrete under freeze-thaw cycles.
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Acknowledgments
The authors would like to acknowledge the financial support from National Natural Science Foundation of China, under Grant No. 51108021 and Highway Scientific Research Institute of Ministry of Communications, China, under Grant No. 2006 318 223 02-08.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 24 • Issue 9 • September 2012
Pages: 1165 - 1174
Copyright
© 2012 American Society of Civil Engineers.
History
Received: May 17, 2011
Accepted: Jan 26, 2012
Published online: Jan 28, 2012
Published in print: Sep 1, 2012
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