Constructing High-Density Longitudinal Joints To Improve Pavement Longevity
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2024-08-01
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Edition:Final Research Report
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Abstract:In Oregon, asphalt cracking is the primary distress mode, necessitating costly rehabilitation and maintenance. Cracking failures around longitudinal joints (especially on roadway sections with centerline rumble strips) have been an important issue in Oregon, affecting the overall long-term performance of the Oregon roadway network. Longitudinal joint construction in asphalt pavements is the most critical phase of the construction process, as it is difficult to achieve a consistently high density of longitudinal joints similar to the mat density. This issue often affects the structural integrity and results in premature failure of the asphalt pavements. The primary objective of this research study was to determine the most effective longitudinal joint construction strategies for Oregon. Based on the findings from all components of this study, high tack coat application (at rates ranging from 0.14gal/yd2 to 0.18gal/yd2) on the longitudinal joint and the hot pinch methods were recommended to be used together to improve the density and the cracking resistance along the longitudinal joints. The proprietary Void Reducer product was also determined to improve the density and cracking resistance of the longitudinal joints. However, the cost of this strategy is higher than that of the other strategies. For this reason, for a limited paving budget, its use can be limited to applications in critical locations such as colder regions, mountainous areas, and critical highways with heavy truck traffic. This strategy is recommended for use in several additional constructions if funding is available.
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