نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی راه و ترابری، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران
2 استادیار گروه مهندسی راه و ترابری، دانشکده مهندسی عمران، دانشگاه سمنان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Fatigue cracks are considered one of the most significant pavement failures. The cause of fatigue cracks is the changes in environmental temperature conditions and the repeated loading of vehicles. Additives can enhance the tensile strength of asphalt pavement layers and increase their life. In this article, through laboratory studies, the effect of using a rejuvenator as an additive in asphalt mixture, called “Rapiol”, on improving the fatigue performance of both unaged and aged asphalt pavements was investigated. To achieve this, the study was utilized the Linear Amplitude Sweep (LAS) test at strain levels of 2.5% and 5%, and the Four-Point Bending Beam (4-PBB) test in strain-control mode (at strain levels of 400, 600, and 800 microstrains). The LAS test results indicate that in unaged conditions, the Rapiol rejuvenator improved fatigue life by 7.5% and 3% at strain levels of 2.5% and 5%, respectively. However, in aged samples, fatigue life increased by 4.1% at 2.5% strain but decreased by 21.8% at 5% strain. Moreover, according to 4-PBB test results, using Rapiol in unaged asphalt mixture samples enhanced fatigue life by 42% and 284% at 400 and 800 microstrain, respectively. Similarly, in aged asphalt mixture samples, fatigue life increased by 100% and 500% at 400 and 800 microstrain, respectively.
کلیدواژهها [English]
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