Micromechanics-Based Predictions on the Overall Stress-Strain Relations of Cement-Matrix Composites
Publication: Journal of Engineering Mechanics
Volume 134, Issue 12
Abstract
A micromechanics-based model is proposed to determine the nonlinear stress-strain relations of cement-matrix composites at different concentrations of inclusions (aggregates). We first conducted some experiments to uncover the stress-strain behavior of the cement paste with a water-to-cement ratio of 0.45, and those of the mortar with the same cement paste but at three different volume concentrations of aggregates. The behavior of the cement paste is then simulated by Burgers’ rheological model. In the development of the composite model, we extend the linear elastic response to the nonlinear one through the replacement of elastic moduli by the corresponding secant moduli. The nonlinear stress-strain curves of the cement-matrix composite are then determined from those of the cement paste and inclusions. It is shown that the predicted stress-strain curves of the mortar are in close agreement with the experimental curves up to an aggregate volume fraction of 49% or .
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Acknowledgments
H. H. Pan was supported by the Taiwan National Science Council under NSC UNSPECIFIED90-2211-E-151-004, and G. J. Weng was supported by the U.S. National Science Foundation, Mechanics and Structure of Materials Program, under NSFCMS-0510409.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 134 • Issue 12 • December 2008
Pages: 1045 - 1052
Copyright
© 2008 ASCE.
History
Received: May 5, 2006
Accepted: Mar 31, 2008
Published online: Dec 1, 2008
Published in print: Dec 2008
Notes
Note. Associate Editor: Dinesh R. Kattti
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