Effective Timing for Two Sequential Applications of Slurry Seal on Asphalt Pavement
Publication: Journal of Transportation Engineering
Volume 139, Issue 5
Abstract
This study evaluated the field performance of asphalt pavements with two sequential slurry seal applications, developed performance models for asphalt pavements without slurry seals and asphalt pavements receiving slurry seals at various times following construction, and identified the optimum time for the application of two slurry seals on asphalt pavements within the Washoe County, Nevada, region. This is a continuation of a previous study in which a single application of slurry seal was investigated. The MicroPAVER system was used to evaluate the long-term pavement performance data collected for the last 15 years and the cost-effectiveness of slurry seals applied to new and existing flexible pavements at 0, 1, 3, 5, 7, and 9 years after construction. The data generated in this study clearly reveal an optimum time window for slurry seal application. The optimum times and highest relative benefit of application of slurry seals for both overlaid and newly constructed pavements were when the first slurry seal was applied at 3 years after construction, followed by a second slurry seal at year 7 or 9. Accordingly, it was recommended to apply the first slurry seal for newly constructed and overlaid pavements, respectively, when the pavement condition index (PCI) is 90 and 87, followed by a second slurry seal when the PCI reaches a value of 86 and 77.
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Acknowledgments
The contents of this paper are part of the overall effort between the Regional Transportation Commission (RTC) of Washoe County and the Pavements/Materials Program at the University of Nevada, Reno (UNR). However, the contents of this report reflect the views of the authors and do not necessarily reflect the official views and policies of the RTC. The authors would like to thank the RTC for its support, and the city of Reno, city of Sparks, and Washoe County Engineering Department for providing access to their pavement-management data. Further gratitude is also expressed to Jose Pablo Vargas of National Laboratory of Materials at University of Costa Rica for help in the study.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 139 • Issue 5 • May 2013
Pages: 476 - 484
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 25, 2012
Accepted: Nov 9, 2012
Published online: Nov 12, 2012
Published in print: May 1, 2013
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