Laboratory Evaluation of Critical Properties and Attributes of Calcined Bauxite and Steel Slag Aggregates for Pavement Friction Surfacing
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 8
Abstract
The long-term friction performance of safety-focused friction surfacing, especially high-friction surface treatment (HFST), relies primarily on the properties of aggregate. Nevertheless, inconsistencies exist in the properties and attributes and requirements for aggregates across the country. A study was conducted to evaluate the properties of the calcined bauxite and steel slag aggregates selected for HFST. Differences were identified between the British Standard (BS) and AASHTO test methods for aggregate abrasion and polishing. Laboratory tests were conducted to determine the mechanical, physical, chemical, and geometric properties of the selected aggregates. It was found that the Micro-Deval abrasion (MDA) test is a repeatable test. A size effect existed in both the abrasion and polishing tests. It was concluded that steel slag may be used as an alternative aggregate for friction surfacing. The requirements for aggregates for HFST were established in terms of the critical property attributes, particularly the Los Angeles abrasion (LAA), MDA, and polish value PV-10, which can be readily implemented by state Departments of Transportation.
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Acknowledgments
This work was supported by the Joint Transportation Research Program (JTRP) administered by Indiana Department of Transportation and Purdue University. The authors would like to thank the study advisory committee members, including Bill Tompkins, Tim Wells, Mike Holowaty, Matt Beeson, Mike Prather, Scott Chandler, Chris Moore, Ed Spahr, Enass Zayed, and Rick Drum for their guidance. Special thanks are extended to Bob Rees and Bart Williamson for their assistance in laboratory testing. The authors recognize the help from Frank Julian, David Merritt, Doug Fromm, Patrick Malfitano, Georgia Eusner, George Wang, and Mike Blackwell.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Nov 13, 2018
Accepted: Mar 4, 2019
Published online: May 25, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 25, 2019
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