Determination of Accurate Creep Compliance and Relaxation Modulus at a Single Temperature for Viscoelastic Solids
Publication: Journal of Materials in Civil Engineering
Volume 20, Issue 2
Abstract
Creep compliance (or relaxation modulus), which is a fundamental property that determines the strain (or stress) development in flexible pavements or damage evolution in asphalt mixtures, can be determined from either a creep compliance test using static loading or a complex modulus test using cyclic loading. Since the nature of each test is different, creep compliance determined from the complex modulus test was significantly different compared with that determined from the creep compliance test. From this rigorous experimental and analytical study, it was concluded that the creep compliance or complex modulus test alone is not capable of providing complete information over the typical time or frequency range used in single-temperature tests. In general, the complex modulus test provides accurate creep compliance at short loading time, while the creep compliance test provides accurate creep compliance at longer loading time. An approach to determine accurate creep compliance from the combination of creep and complex modulus tests at a single temperature was developed. The method provided accurate creep compliance values that corresponded to short-term and long-term experimental data.
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Acknowledgments
The writers would like to thank Howard Moseley and Shanna Johnson for their assistance in preparing specimens.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 20 • Issue 2 • February 2008
Pages: 147 - 156
Copyright
© 2008 ASCE.
History
Received: Feb 5, 2007
Accepted: Jun 18, 2007
Published online: Feb 1, 2008
Published in print: Feb 2008
Notes
Note. Associate Editor: Eyad Masad
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