Study on Strain-Rate Sensitivity of Cementitious Composites
Publication: Journal of Engineering Mechanics
Volume 136, Issue 9
Abstract
In this study, we conduct a combined experimental and micromechanical investigation into the strain-rate sensitivity of concretes, with a special reference to the effect of aggregate concentration. We first measured the stress-strain relations of Type I portland cement with 0.45 water-to-cement ratio (w/c), and then those of the mortar containing sand aggregates of up to 50% volume concentration, over six orders of magnitude of strain rate, from to under compression. It was found that, at a given strain rate, the peak stress increases with the aggregate concentration but the peak strain tends to decrease with it. At a given aggregate concentration, the peak stress also increases with strain rate whereas the peak strain generally decreases with it. We then developed an inclusion-matrix type micromechanical model to simulate the behavior of the concrete. In this process the nonlinear viscoelastic behavior of the portland cement was modeled by a modified Burger's model with strain-rate dependent spring and dashpot elements, and the stress-strain relations of the mortar at various aggregate concentrations and strain rates were calculated from a two-phase composite model with a secant-moduli approach. It is shown that the measured data could be sufficiently well predicted by the developed micromechanics composite model.
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Acknowledgments
H. H. Pan was supported by the Taiwan National Science Council under Grant No. NSCTNSC 96-2221-E-151-046, and G. J. Weng was supported by the U.S. National Science Foundation, Division of Civil, Mechanical and Manufacturing Innovation, Mechanics and Structure of Materials Program, under Grant No. NSFCMS-0510409.
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© 2010 ASCE.
History
Received: Mar 4, 2009
Accepted: Feb 23, 2010
Published online: Feb 25, 2010
Published in print: Sep 2010
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