Thermal Degradation of Heterogeneous Concrete Materials
Publication: Journal of Materials in Civil Engineering
Volume 17, Issue 3
Abstract
In this paper, we examine the interaction of thermal and mechanical damage processes in heterogeneous materials such as concrete. After a brief introduction of high temperature effects in concrete, we address two topics: (1) the interaction of thermal and mechanical damage at the mesomechanical level of observations, when volumetric and deviatoric degradation take place simultaneously; and (2) the effect of thermal expansion and shrinkage in the two-phase concrete material when thermal softening of the elastic properties leads to massive degradation of the load resistance.
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Acknowledgments
The writers thank the reviewers for their insightful and thought-provoking discussion. One reviewer argued that micromechanical considerations lead to a product decomposition only when damage evolves at two different length scales of observation; hence, the additive decomposition of damage is more appropriate, because the thermal and mechanical damage processes evolve at the same mesoscale of observation. The other reviewer queried the origin of the thermal shrinkage effect proposed by Khoury et al. (1985) for the cement matrix illustrated in Fig. 8. His/her question was certainly very appropriate, because the corresponding large increase of thermal damage in Fig. 9 is mainly responsible for the large difference in response behavior with and without shrinkage shown in Figs. 16 and 17.The writers wish to acknowledge partial support of this research by the U.S. National Science Foundation under grants CMS 9872379 and CMS-0084598. The opinions expressed in this paper are those of the writers and do not necessarily reflect those of the sponsor.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 3 • June 2005
Pages: 276 - 285
Copyright
© 2005 ASCE.
History
Received: Apr 6, 2004
Accepted: Aug 11, 2004
Published online: Jun 1, 2005
Published in print: Jun 2005
Notes
Note. Associate Editor: Zdenek P. Bazant
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