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Improving Rigid Pavement Smoothness using PolyLevel
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2018-05-01
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[PDF-2.37 MB]
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Edition:Final Report, October, 2015 to March, 2018
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Abstract:Concrete pavement slab differential settlement (drop-off) is one of the major problems encountered in jointed rigid pavements after years of service. The conventional method to rectify this problem is to lift the slabs using injected asphalt or concrete mud, slab grinding, partial/full depth repair or asphalt overlay. The Tennessee Department of Transportation (TDOT) investigated the use of PolyLevel® material to level settled slab in Chattanooga, Tennessee (TN). The study sections were monitored for two and half years to evaluate pavement surface roughness using a high-speed inertia profiler to obtain raw longitudinal profiles; and a smartphone-based application called Roadroid app to obtain the estimated IRI (eIRI). The raw longitudinal profiles were analyzed by the profile viewing and analyzing (ProVAL) software to compute the international roughness index (IRI) and the mean roughness index (MRI). The application of PolyLevel® was within the scheduled time. A ride quality survey was conducted before application of the material, and at about every eight months after application using the high-speed inertial profiler. The smartphone-based app was used to monitor the treated sections monthly. Generally, the pavement ride quality improved (numerical decrease in index values) immediately after application. It increased approximately one year after application on some section and continued to decrease on others. However, the decrease or increase in MRI did not change the state of section (in terms of ride quality condition) in which it was before application of the material. The questionnaire sent to state DOT's indicated that out of the respondents that have used polyurethane materials, about 90% recommend a continual use of polyurethane materials. Laboratory tests were performed to obtain mechanical properties of PolyLevel® needed for finite element (FE) analysis. FE analysis indicated that strains on PolyLevel® material will increase with increase on cyclic loading but the number of cycles it takes for materials to fail was not determined in this study.
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