Finite-Element Modeling of Cementitiously Stabilized Beams Using a Smeared Fracture Approach
Publication: International Journal of Geomechanics
Volume 9, Issue 1
Abstract
Cracking is considered a vital distress in a pavement structure. It generally initiates and propagates (bottom up and/or surface down) causing damage to the overall pavement structure. Most previous numerical modeling studies have assumed the stabilized layer as an uncracked layer, thereby overestimating the overall stiffness of a pavement structure. Recent developments in the finite element modeling technique and availability of general purpose computer programs have significantly enhanced the treatment of cracks in numerical modeling of a stabilized layer. This study focuses on employing a smeared crack model to investigate the flexural behavior of stabilized beams. The employed model is calibrated for Meridian aggregate stabilized with 10% class C fly ash by performing laboratory tests, namely, tensile strength, compressive strength, biaxial strength, and fracture energy. Load-deflection curves form the finite element calculations are compared with pertinent laboratory test results. Overall, numerical results show a fairly good agreement with the laboratory test results, although some difference is observed among the load-deflection curves, particularly in the softening zone. Overall, the smeared crack approach appears to be a useful tool for predicting the flexural behavior of cementitiously stabilized aggregate bases.
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Acknowledgments
The writers would like to thank the reviewers for their constructive comments and suggestions that helped improve the quality of this paper. The writers are thankful to the Oklahoma Department of Transportation (ODOT) for the financial support of this study. In particular, contributions of colleagues from the Materials Division and the Planning and Research Division are gratefully acknowledged. Appreciation is extended to Martin-Marietta Company for providing the aggregate and to Boral Materials Technology for providing the CFA for this study. Special thanks are extended to Mike Schmitz for his assistance in laboratory testing. Finally, thanks are extended to Dr. Joakim Laguros for his comments and assistance, and to undergraduate and graduate students for their assistance.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 9 • Issue 1 • January 2009
Pages: 34 - 42
Copyright
© 2009 ASCE.
History
Received: Apr 7, 2006
Accepted: Aug 26, 2008
Published online: Jan 1, 2009
Published in print: Jan 2009
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