BMP for Issues with Asphalt Centerline Joint and Intelligent Compaction for Local Agencies

It is well-known that the quality of longitudinal joint construction is critical to the life of flexible pavements. The maintenance activities caused by the direct or indirect effect of longitudinal joint deteriorations have become a challenge for many highway agencies. A 2009 Federal Highway Administration (FHWA) survey of their divisional offices found that about 50% of their engineers reported being unhappy with the performance of longitudinal joints. Local agencies are reporting problems with deterioration (raveling) along the centerline paving joint of asphalt roadways. Several questions are raised to understand this widespread problem, including whether the source of the issue is material, specification, constructional quality, and method-related, or a combination of these issues. Consequently, there have been numerous research efforts by academia, highway agencies, and industry in the last 30 years. Besides, training on the placement and compaction of HMA pavements is available within the industry. Despite all these efforts, longitudinal joint deterioration is still one of the prime causes of premature failure of flexible pavements. Improving longitudinal joint construction can improve density and decrease permeability. It is probably the single most crucial remedy one can adopt to improve the pavement performance. The main objective of this study is to identify the best approach to enhance the performance of longitudinal joints for future projects and recognize how to fix the failed centerline joints cost-effectively. The purpose of this research is not to do additional investigations on longitudinal joint construction or evaluating density and its relationship to permeability and oxidation. The research team will take advantage of the information from the past research and search for consensus to make recommendations on how to construct and specify longitudinal joints in flexible pavements. The best practices will be documented based on literature and recent experiences. Another goal of this research is to evaluate density/air void measurements by using Density Profiling System (DPS) for evaluating longitudinal joint quality by local road agencies. This will be achieved by performing a pilot study to demonstrate the technology use and identify specific needs for its implementation at the local level in the future.