文章基本信息

标题：Comparison of Fatigue Resistance of HMA and WMA Mixtures Modified by SBS
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作者：Mansour Fakhri ; Mansour Fakhri ; Ali Reza Ghanizadeh 等
期刊名称：Procedia - Social and Behavioral Sciences
印刷版ISSN：1877-0428
出版年度：2013
卷号：104
页码：168-177
DOI：10.1016/j.sbspro.2013.11.109
语种：English
出版社：Elsevier
摘要：AbstractThis study aims to investigate the effect of warm mix asphalt (WMA) additives on fatigue life of unmodified and SBS- modified asphalt mixes. Two different WMA additives, including Aspha-min and Sasobit were used to fabricate WMA specimens. Fatigue test was performed on warm polymer modified asphalt (PMA) by indirect tensile test on two stress levels (300,450kPa) at 20°C and fatigue life was compared with PMA mixture. Also, indirect tensile strength (ITS) test was performed to determine the moisture susceptibility of warm PMA. In order to evaluate the fatigue performance of warm mix asphalt (WMA) mixtures in comparison with hot mixture asphalt (HMA), four-point flexural beam test was employed. Four- point flexural beam test was conducted at four strain levels (650, 800, 1000 and 1200μɛ) and frequency of 7.5Hz at 20°C. According to the test results, it was shown that warm PMA mixtures prepared by Aspha-min and Sasobit, have less fatigue resistance in comparison with PMA mixture. Also the fatigue resistance of warm PMA mixture made by Sasobit is greater than fatigue resistance of warm PMA mixture made by Aspha-min. Based on the ITS test results, warm PMA with Sasobit additive and PMA achieved the desirable tensile strength ratio (TSR) criterion (80%) but warm PMA Aspha-min had TSR lower than 80%. Also fatigue life determination based on 50% reduction in initial stiffness showed that the fatigue life of HMA mixture is less than WMA mixtures at lower strain levels whereas it was comparable with warm mix asphalt at higher strain levels.
关键词：Warm Mix Asphalt;Polymer Asphalt Mixture;Indirect Tensile Fatigue test;Beam Fatigue test