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Change in fatigue behavior of asphalt hot mixes produced with asphalt rubber binders

机译:用沥青橡胶粘合剂生产的沥青热混合料的疲劳性能变化

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摘要

Fatigue life of asphalt hot mixes is given as a function of both stiffness and tensilestrains induced in the bottom of the wearing courses of flexible pavements. In conventional as-phalt hot mixes the increase of stiffness leads to a decrease of fatigue life. However, this work shows that there is an increase of both fatigue life and stiffness of asphalt rubber hot mixes in comparison with the asphalt hot mixes produced with straight binders. In this work laboratory tests were performed in asphalt hot mixes with dense and gap gradation produced with straight binder (AC 50/70) and asphalt rubber binder manufactured by the wet process. Resilient mod-ulus and fatigue life tests under four point bending procedure were used to determine the me-chanical behavior of studied mixtures. The results show that the use of asphalt rubber binder produced an increase of both fatigue life and stiffness of the studied mixtures.
机译:沥青热混合料的疲劳寿命是在柔性路面的磨损层底部产生的刚度和拉伸应变的函数。在传统的沥青热混合料中,刚度的增加导致疲劳寿命的降低。但是,这项工作表明,与使用直接粘合剂生产的沥青热混合料相比,沥青橡胶热混合料的疲劳寿命和刚度都有所提高。在这项工作中,实验室测试是在沥青热混合料中进行的,沥青混合料具有由直质粘合剂(AC 50/70)和通过湿法生产的沥青橡胶粘合剂产生的致密和间隙渐变。使用四点弯曲程序下的弹性模量和疲劳寿命测试来确定所研究混合物的机械性能。结果表明,沥青橡胶粘合剂的使用增加了所研究混合物的疲劳寿命和刚度。

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