Developing a Lower Modulus Polymer Resin Binder Systems Specifications for High Friction Surface Treatment (HFST) on Asphalt Pavements in Nevada
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2024-04-09
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Edition:Final Report 11/2019 to 12/2023
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Abstract:A variety of physical property measurements were performed including Dynamic Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA), compression testing, tensile testing, heat deflection temperature (HDT) testing, and Coefficient of Thermal Expansion (CTE) testing. Results showed a wide range of properties of the resins. Lab scale application of the HFST resins onto asphalt with subsequent thermal cycling from -30°C to +55°C performed to determine the cracking or delamination propensity and correlate it to material properties. Unfortunately, no HFST failure was observed. Overall, while material properties could be obtained, the lack of any laboratory test with sufficient resolution to controllably fail HFST on asphalt prevents correlation to properties and, thus, no determination of “optimal” formations for HFST resin could be determined. Wheel polishing on slabs was also performed, with little difference between most resins. There seemed to be a weak inverse correlation between Dynamic Friction Test (DFT) values and modulus with low modulus binders having the highest DFT values at 300,000-wheel passes. Further, one anomalous material had a rapidly decaying DFT value, and it was determined that this was the only material tested above its HDT, indicating that HDT may be a metric in determining upper usage temperature.
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