Variability and Scale-Dependency of Tire-Derived Aggregate
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 3
Abstract
This paper presents a variability study of several engineering properties of tire-derived aggregate based on a comprehensive literature survey of experimental test programs. The dry compacted unit weight, cohesion intercept, friction angle, constrained modulus, and modified secondary compression index were evaluated and compared to the engineering parameter variability of natural soils. A series of regression analyses were performed to investigate the presence and significance of scale-dependency. The results of the variability analysis indicate that unit weight has the lowest value of coefficient of variation (COV) whereas the shear strength parameters, constrained modulus, and compression index have COV values that are substantially higher. Regression analyses indicated that unit weight and constrained modulus showed the greatest sensitivity to changes in maximum tire particle size. A nonstatistical investigation was used to further investigate the variability and scale-dependency of the shear strength parameters. Using Mohr-Coulomb failure criterion and assuming that cohesion is negligible, the analysis showed a scale-independent relationship which is consistent with the statistical findings for cohesion and friction angle.
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Acknowledgments
Financial support for this research was provided in part by the National Science Foundation under Grant No. NSFCMS-0134370. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of the National Science Foundation. Additional financial support for this research was provided in part by the Koerner Fellowship at Drexel University, Philadelphia.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 3 • March 2007
Pages: 233 - 241
Copyright
© 2007 ASCE.
History
Received: Aug 30, 2005
Accepted: Nov 15, 2005
Published online: Mar 1, 2007
Published in print: Mar 2007
Notes
Note. Associate Editor: Louay N. Mohammad
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