Stone-on-Stone Contact of Permeable Friction Course Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 11
Abstract
Stone-on-stone contact of the coarse-aggregate fraction is one of the main characteristics of permeable friction course (PFC) asphalt mixtures that is required to provide adequate resistance to both raveling and permanent deformation. Currently, stone-on-stone contact is determined by comparing the air voids content in the coarse aggregate (VCA), assessed in both the dry-rodded condition and the compacted PFC mixture . The underlying assumption is that the coarse aggregate of a compacted PFC mixture with equal to would develop a stone-on-stone contact condition equivalent to that existing in the dry-rodded aggregate. This study focused on proposing enhancements for the quantitative determination of stone-on-stone contact of PFC mixtures. The assessment supported on both laboratory testing and application of the discrete element method and image analysis techniques, led to recommendation of a criterion to determine the breaking-sieve size. In addition, verification of stone-on-stone contact using a maximum VCA ratio of 0.9 was recommended to ensure the design and construction of PFC mixtures with fully developed stone-on-stone contact.
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Acknowledgments
This study was originally conducted for the Texas DOT (TxDOT), and the writers thank TxDOT and the Federal Highway Administration for their support in funding this study. Thanks are also due to the Southwest Region University Transportation Center (SWUTC) for providing additional funding to complete this study. Special thanks are expressed to the National Science Foundation for providing funds, under the Major Research Implementation (MRI) program, for the acquisition of the X-ray computed tomography equipment at Texas A&M University. The first writer, as Assistant Professor of the University of Magdalena (Colombia), also expresses special thanks to the University of Magdalena and COLCIENCIAS (Colombia) for sponsorship of his graduate studies at Texas A&M University.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 11 • November 2010
Pages: 1129 - 1138
Copyright
© 2010 ASCE.
History
Received: Sep 10, 2009
Accepted: Apr 2, 2010
Published online: May 8, 2010
Published in print: Nov 2010
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