Micromechanics Model to Describe Strain Behavior of Concrete in Freezing Process
Publication: Journal of Materials in Civil Engineering
Volume 20, Issue 1
Abstract
On the basis of micromechanics consideration of frost damage, a theoretical model to describe the freeze-induced strain behavior of porous materials such as concrete is presented. The model is derived from the thermodynamic equilibrium condition. Fundamental equations are derived on the microscopic level where temperature-induced phase transitions and the resulting mass transfer within the pore structure are taken into consideration. The local deformation obtained from the microscopic considerations around pores is then averaged to evaluate the nominal strain on a macroscopic level. Components of the macroscopic deformation in the presented model are the thermal strain, the expansion due to the internal pressure caused by the phase transition, the smeared cracking strain due to accumulation of microcracks, and the shrinkage due to the mass transfer caused by the microice-lens mechanism. Experimental studies are carried out with mortar specimens of three different mix proportions. The theoretical prediction is then compared with the experimental results and a good agreement is obtained.
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Acknowledgments
The writers would thank Dr. Shinsaku Tada of Texte Inc. for the very valuable discussion. They also acknowledge the support of Japan Society for the Promotion of Science in terms of the Grant-in-Aid for Scientific Research.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 20 • Issue 1 • January 2008
Pages: 46 - 53
Copyright
© 2008 ASCE.
History
Received: Jun 15, 2005
Accepted: Sep 22, 2006
Published online: Jan 1, 2008
Published in print: Jan 2008
Notes
Note. Associate Editor: Byung Hwan Oh
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