详情

Characterization of Asphalt Binders Exposed to Extreme Temperatures Through Simple and Effective Test Methods

项目名称：	Characterization of Asphalt Binders Exposed to Extreme Temperatures Through Simple and Effective Test Methods
摘要：	Temperatures in the lower 48 states are projected to increase about 2.3C (4.1F) by 2050 relative to 2010 according to the NCHRP Report, "Climate Change, Extreme Weather Events and the Highway System: A Practitioner's Guide". As average temperatures increase, so will extremes. Consequently, the extreme climate/temperature-based performance grading (PG) of polymer modified asphalt binders will be affected. The polymer characterization in a modified asphalt binder is currently performed by PG Plus tests (e.g., force ductility test, AASHTO T300). However, force ductility, elastic recovery and some other PG Plus tests are time and material consuming processes. The results are subject to reproducibility difficulties and methods are mostly empirical. Therefore, there is a need for better methods. The main objective of this research is to develop a simple and dynamic shear rheometer based test method that can be used as an alternative to PG Plus tests (elastic recovery and force ductility) to accurately determine high temperature performance of asphalt materials. Toward meeting the objective of this study, asphalt binders from different sources in the southern plains region will be collected for mechanistic evaluation. Further, binders will be recovered from reclaimed asphalt pavement and tested in the laboratory. In particular, multiple stress creep recovery (MSCR) and extensional rheometer tests will be conducted on asphalt binder samples. Research outcomes will include MSCR guidelines for the southern plains states and a new laboratory test method for polymer network characterization in extreme temperature asphaltic materials. The guidelines will provide guidance regarding the use of combined shear and extensional rheology platform to replace the ductilometer based force ductility test (AASHTO T300). This new method is expected to save cost by significantly reducing test time and sample size. Implementable specifications for commonly used extreme temperature asphaltic materials will be developed for immediate implementation or DOT's internal pilot projects.
状态：	Active
资金：	460393.00
资助组织：	Silver Star Construction Company<==>Oklahoma Department of Transportation<==>Haskell-Lemon Construction<==>Arkansas State Highway and Transportation Department<==>Louisiana Transportation Research Center<==>Research and Innovative Technology Administration
执行机构：	Louisiana State University, Baton Rouge<==>University of Oklahoma, Norman<==>Arkansas State University, State University<==>Louisiana Tech University, Ruston
开始时间：	20141001
实际结束时间：	20160930
主题领域：	Highways；Maintenance and Preservation；Pavements；I30: Materials