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Asphalt Binder Rheological Characterization for Extreme Climate Events
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2019-11-01
[PDF-2.29 MB]
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Edition:Final Report August 2014 – July 2019
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Abstract:Seal coats, also known as chip seals, are a cost-effective preventive maintenance treatment used to extend the service life of flexible pavements. In addition to properties of seal coat materials, heavy vehicle loading and sustained extreme temperatures that appear to occur with increasing frequency, also contribute to premature pavement distresses. Asphalt, being a thermoplastic polymer, is significantly affected by fluctuations in ambient temperatures, and current test protocols have not been developed with extreme climate patterns we experience today, in mind. Conducting laboratory experiments for fluctuating extreme conditions is a highly resource- and time-intensive endeavor. Therefore, finding more effective ways to evaluate asphalt binder response under a different performance scenarios can be very helpful to pavement engineers. If such an approach is available, that can also help in the development of material systems such as novel asphalt modifiers that can help improve pavement performance under extreme temperatures. This research project focused on (1) assessing future climate trends, (2) relating climate patterns to pavement performance, and (3) assess molecular dynamics (MD) simulations as an effective way to establish relationships between asphalt chemical composition and rheological properties at extreme temperatures. Findings from this research can help build and maintain highways that are more resilient to extreme climate conditions. The outcomes of this research will enable highway agencies to develop new asphalt modification and testing protocols to better predict pavement performance.
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