Develop Guidelines and Best Practices for Bonding Hot-Mix Asphalt to Portland Cement Concrete Pavement: Final Report
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2022-10-01
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Edition:Final Report, September 2020 – August 2022
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Abstract:Proper bonding between different layers of a composite pavement is the major factor in ensuring that the entire structure acts as a monolithic layer under loading. This bonding is provided by a thin layer of tack coat that is applied between the pavement layers. This project studied the bonding between hot mix asphalt (HMA) and concrete layers of a composite pavement using tack coats. The goals of this study were to: (i) identify, develop, and validate a test method(s) that can be used on a routine basis to screen and/or field-test the quality of the bond between the asphalt and the concrete layer; (ii) use the method to evaluate the impact of various factors on the performance of the bond, including but not limited to type of tack coat or membrane, application rate, surface texture (including cost-effective and innovative ways to prepare concrete surfaces), and surface moisture; and (iii) propose guidelines for future selection of surface preparation techniques and materials that will meet the requirements for adequate bonding at the interlayer surfaces. This study developed two test procedures. One test is a direct shear test using roadway cores or laboratory manufactured samples for use in the laboratory. The second is a pull-of test that can be conducted in-situ on a project site. Laboratory and field testing allowed development of suggested limits for these tests to indicate adequate bond strength. Pavement preparation for the concrete pavement for tack and HMA overlay were also suggested.
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