Poromechanical Damping of Cementitious Materials
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 2
Abstract
Other than through the creation of fracture surfaces, cementitious materials do not generally contribute significantly to strain energy dissipation or damping during dynamic loading of civil infrastructure. In this paper, the potential to increase damping of cementitious materials through utilization of poromechanical effects is evaluated. Pervious cement paste and mortar specimens were fabricated and their uniaxial damping measured at loading frequencies ranging from 0.01–25 Hz. To evaluate the poromechanical effect, the damping of specimens with water, glycerol, and glycerol/water blends constituting the pore fluid was measured, and the results were compared with the measured damping of dried specimens. It was found that significant poromechanical damping can be generated in cementitious materials, and the frequency at which the damping is maximized can be controlled by changing material properties that dictate the hydrodynamic relaxation time. It was also discovered that poromechanical modeling under predicts the measured damping increase induced by saturating porous concrete, indicating that the degree of saturation influences the inherent viscoelastic damping of cementitious materials.
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Acknowledgments
The authors thank US Silica, BASF, and Grace Construction Products for providing materials for this research. This research was supported by the National Science Foundation under Grant No. NSFCMMI-0727143. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 24 • Issue 2 • February 2012
Pages: 232 - 238
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Mar 15, 2011
Accepted: Jul 20, 2011
Published online: Jul 22, 2011
Published in print: Feb 1, 2012
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