Evaluation of Construction Practices That Influence the Bond Strength at the Interface between Pavement Layers
Publication: Journal of Performance of Constructed Facilities
Volume 22, Issue 3
Abstract
This study investigated the influence of several construction practices on the bond strength at the interface between pavement layers. These practices included the surface treatment, curing time, residual application rate, and equipment tracking. Three tests were performed for estimating the bond strength between an existing hot mix asphalt (HMA) and a newly constructed HMA overlay, namely the Florida Dept. of Transportation shear tester, the University of Texas at El Paso pull off test, and the torque bond test. Testing involved a CSS-1 type emulsion as the tack coat. The results from the three tests were statistically analyzed. Generally, milling provided a significantly better bond at the interface between the existing surface and the new overlay. Curing time had a minimal effect on the bond strength. The results indicated that the absence of tack coat did not significantly affect the bond strength at the interface for the milled sections, whereas it severely decreased the strength for the nonmilled sections. The results also showed that increasing the residual rate of tack coat did not generally affect the bond strength at the interface.
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Acknowledgments
A number of individuals and agencies have contributed to the successful completion of this study. This research was sponsored by the Washington State DOT through a pooled-funded study with contributions from Minnesota DOT, Texas DOT, and Florida DOT. Special thanks go to John Grisham of Woodworth & Company Inc.; Dave Bell of Lakeside Industries; Tom Gaetz of Washington Asphalt Pavement Association; Vivek Tandon of the University of Texas at El Paso; Gregory Sholar of the Florida DOT, Mel Hitzke, Terry MacAuley, Dave Mayoh, Mark Willoughby, Mark Rickert, and John Brooks of Olympic and Northwest Region personnel; Jeff Uhlmeyer and Jim Weston of Headquarters Materials Laboratory personnel; Louay Mohammad of Louisiana State University; and Joe Button of Texas A&M University.
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© 2008 ASCE.
History
Received: Mar 15, 2007
Accepted: May 25, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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