United States Department of Transportation
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Laboratory Performance Evaluation of Pavement Preservation Alternatives
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2019-03-01
[PDF-2.92 MB]
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Corporate Contributors:Rutgers University. Center for Advanced Infrastructure and Transportation ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Department of Transportation. University Transportation Centers (UTC) Program ; New Jersey. Dept. of Transportation
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Edition:Final Report, 09/01/2018 –03/31/2020
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Abstract:This paper introduces a laboratory procedure for evaluating the performance benefits of pavement preservation alternatives and determining the least acceptable pavement conditions on which such treatments can be applied effectively. Two pavement preservation alternatives were evaluated: chip seal and microsurfacing. In addition, this paper presented a procedure for fabricating HMA samples treated with chip seals or microsurfacing for testing using a modified Overlay Test procedure. Three damage severity levels, representing varying pavement conditions, were also evaluated as part of this study: excellent condition with no cracks, low severity cracks (3 mm. wide), and medium severity cracks (6 mm. wide). The applicability of the introduced laboratory evaluation procedure was determined by assessing the sensitivity of the OT cycles to failure to capture the differences among the various samples. The least acceptable pavement conditions were determined based on cracking resistance improvements attained by applying preservation treatments. Analysis of Variance was also conducted to compare the difference among the tested sample groups. Based on testing results, it was concluded that the laboratory procedure for fabricating HMA samples treated with either a chip seal or a microsurfacing was found to produce consistent samples. This was the case because the bulk specific gravity values were similar providing evidence that the fabrication procedure results in comparable samples. The OT test was found to be sensitive to treatment type and damage severity level applied to tested samples; thus, it was successful at differentiating among samples. The OT test results show strong cracking resistance performance of undamaged samples applied with microsurface.
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