Dynamic Fracture and Strain Rate Behavior of Aggregates Used in Transportation
Publication: International Journal of Geomechanics
Volume 8, Issue 1
Abstract
The static and dynamic uniaxial compressive strengths of coarse aggregate materials used in portland cement concrete (PCC) were determined under dry and saturated conditions for three blast furnace slags, three limestones, four dolomites, and two mafic igneous rocks. The slag aggregates exhibited the lowest compressive strength, followed by the carbonates (limestones and dolomites), and the mafic igneous rocks. Both the dry and saturated aggregates revealed a higher compressive strength under dynamic loads compared to the static loads. Based on the experimental data, a rate sensitivity parameter was defined to describe the increase in compressive strength as a function of strain rate. This parameter is deemed to have considerable relevance in evaluating the ability of a specific aggregate to resist dynamic loads such as in aggregate interlock in PCC cracks and joints, friction in asphalt, and also in the development of microfracture during rock blasting. Comparison of the compressive strength data to density and LA abrasion values revealed that the dynamic data have a better correlation to the above properties than the static data.
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Acknowledgments
The research was funded by the Michigan Department of Transportation. We would especially like to thank and acknowledge MDOT and Mr. David Smiley in the funding of this innovated research. Any opinion, findings, and conclusions expressed in this material are those of the writers and do not necessarily reflect the views of MDOT.
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Information
Published In
International Journal of Geomechanics
Volume 8 • Issue 1 • January 2008
Pages: 82 - 90
Copyright
© 2008 ASCE.
History
Received: Mar 31, 2006
Accepted: Aug 1, 2006
Published online: Jan 1, 2008
Published in print: Jan 2008
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