Material Specifications for Longitudinal Joint Construction, Remediation and Maintenance
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2021-12-01
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Edition:11/5/2020 – 11/5/2021
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Abstract:Asphalt pavement density at and near longitudinal construction joints is often significantly lower than the density in the mainline areas of the pavement, which can manifest in premature deterioration of the joint area relative to the mainline. The objective of this project is to synthesize the most probable solutions to deliver better longitudinal joints in Wisconsin. Based on detailed review of published literature and State Highway Agencies’ current practice, methods and materials for quality management and improvement are divided into three categories: Construction and Design (CD), Materials and Methods During Construction (MDC), and Materials and Methods Post-Construction (MPC). This report includes various options available within each of these categories and the ranking for how much each method is used nationally. Using the collected information and input from various stake holders in Wisconsin and a few other states, the research team recommends that WisDOT continue their current standard practice regarding joint geometry and testing of joint density, but also consider evaluation of other alternatives that are showing significant promise in reducing risk of premature joint failures and minimizing the risk of accepting lower density at the joints relative to mainline of pavements. Implementation and evaluation of Void Reducing Asphalt Membrane during the construction process on a trial basis is recommended based on published data and review of case studies. Use of penetrating asphalt emulsions post construction is recommended as both a preventative and remedial treatment for longitudinal joints. It is recommended WisDOT continue to modify the provisional specifications for these materials based on experience with these materials in this region. Although the research was not able to produce life cycle cost estimates of the joint deterioration in Wisconsin or of the proposed treatments using Pavement Condition Index (PCI) data collected by WisDOT, a framework for utilization of the PCI data to accomplish this goal is presented for future consideration.
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