详情

Resistance of Asphalt Mixes with Recycled Materials to Withstand Extreme Temperatures

项目名称：	Resistance of Asphalt Mixes with Recycled Materials to Withstand Extreme Temperatures
摘要：	Reclaimed asphalt pavement (RAP) is increasingly being incorporated into asphalt mixtures for pavement construction and preservation purposes. A study of the climate in the south central states reported an increase in the number of extreme cold days over the past century. Mixtures containing RAP and/or recycled asphalt shingles (RAS) have an increased susceptibility to low-temperature cracking. Unless proper design and performance evaluation tools are in place, the increased occurrence of extreme cold days and diurnal temperature changes, combined with an increase in the use of RAP/RAS mixes, the risk of pavement failure will continue to increase. The objective of the research is to use low-temperature tests on asphalt binders, as well as mortars with and without RAP, as a surrogate to determine the resistance of the asphalt materials to low temperature cracking. A survey of existing pavements will be conducted to identify locations where low-temperature cracking attributed to the use of recycled materials has resulted in premature failure as well as reliable performance. The materials and mixture designs from such sections will be replicated as closely as possible for this study. Field cores will be obtained and standard performance tests will be conducted on selected binders. A low- temperature creep and strength test will be standardized based upon tests recently developed in other research studies. Laboratory test results from selected field mixtures will be used to evaluate and calibrate the laboratory test method. The efficacy of rejuvenators and other remedial measures will be evaluated to determine effect on recycled asphalt pavement durability. The anticipated research deliverable is a user-friendly test method and analysis program that can be used by material and pavement engineers to evaluate cracking resistance of asphalt materials for any pavement cooling scenario (e.g. rapid cooling due to cold front). This will enhance the durability of asphalt mixtures that are increasingly incorporating higher percentages of RAP.
状态：	Active
资金：	393170.00
资助组织：	Arkansas State Highway and Transportation Department<==>Arkansas State University, State University<==>University of Texas at Austin<==>Pavement Preservation Systems, LLC<==>Research and Innovative Technology Administration
执行机构：	Arkansas State University, State University<==>University of Texas at Austin
开始时间：	20140801
实际结束时间：	20160731
主题领域：	Design；Highways；Maintenance and Preservation；Pavements；I30: Materials