United States Department of Transportation
i
A Review of Florida’s FC-5 Raveling Condition Assessment and Measurement Methods
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2022-02-28
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[PDF-3.38 MB]
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Edition:Final Report, March 18, 2020 to February 28, 2022
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Abstract:While open-graded friction course (OGFC) mixtures, called FC-5 in the Florida Department of Transportation (FDOT), provide several safety benefits, their lives are limited to approximately 14 years on average in Florida. The reduced life is generally due to raveling, which rapidly deteriorates once initiated. In FDOT, raveling is rolled up into the crack rating (CR). Therefore, it is difficult to distinguish what amount of the CR is contributed by raveling. This research aims at determining if raveling can be assessed in a more detailed manner, which considers survey approaches and methodologies to rate and separate raveling that can proactively target the raveling-only treatment needs at an early stage. A literature review was conducted on the practices of pavement rating computation and treatment decisions in state DOTs and automated raveling detection and severity classification methods. Then a feasibility study was conducted on using machine learning (ML) models for automated raveling severity classification using FDOT pavement data. Two main recommendations were made based on the technology review and ML feasibility study. First, it is recommended that FDOT leverage its existing 3D line laser imaging system to collect high-resolution pavement surface data, which can be used to objectively identify and locate raveling with a much better spatial resolution. Second, the feasibility study showed that the ML models are feasible for per-image raveling classification on FDOT’s 3D pavement data. It is recommended that FDOT use the random forest (RF) model for future implementation given its high accuracy (86.6%) achieved in the feasibility study. New raveling treatment criteria and condition ratings are also proposed based on the reviewed literature and two cases of FC-5 only projects. It is recommended that more case studies be conducted in the future to determine suitable thresholds for applying FC-5-only resurfacing.
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