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Evaluating Candidate Projects for Seal Coat Stability
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2025-01-01
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[PDF-4.78 MB]
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Edition:September 2021–November 2024
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Abstract:With investments in seal coats exceeding $250 million annually, it is critical to apply the right treatment to the right road at the right time. Projects are typically selected based on the time since the last seal coat (an average of 7 years) with little to no testing performed to ensure that the section is a good candidate for a seal coat. The objective of this research was to determine the maximum number of seal coats that can be applied to a pavement surface before the accumulated layers of seal coats become unstable. The research team evaluated the stability of existing accumulated seal coat substrate layers through a series of laboratory and field tests and developed tests and procedures to determine when an additional seal coat may not perform well. The research team also developed guidelines to select candidate seal coat projects with multiple seal coat layers. These guidelines ensure that new seal coats are applied only to good candidate pavement sections, thus lowering risks, improving life cycle costs, and leading to better performing sections of pavement.
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