RLWT与APA试验原理的有限元模拟

近年来,沥青路面的高温抗车辙性能与设计标准的符合性备受关注。多轮车辙仪RLWT和沥青路面分析仪APA是用来检测路面芯样抗车辙性能的重要仪器。通过有限元分析,比较了2种仪器的试验原理。结果表明,RLWT试验方法对试件内部损伤的反应更加敏感;试件承受整体的剪切和弯拉作用;试件表面2 cm以下,RLWT试件的剪应力和剪应变明显大于APA试件,RLWT试验方法更侧重于对试件的剪切性能的评价。因此,对于高温下混合料芯样抗剪切性能的评价,优先选用RLWT试验方法。研究成果对沥青路面施工质量和对于设计的符合性检验具有重要的指导意义。

Finite element simulation of RLWT and APA test principle

In recent years,compliance of high-temperature ruaing resistance performance of asphalt pavement with design standards is oconcerned.Rotary Loaded Wheel Tester or Rutmeter(RLWT) and Automated Asphalt Pavement Analyzer(APA) is important instruments,which is used to detect anti-rutting performance of pavement core samples.Through a finite element simulation,their principle were analyzed.The results show that,RLWT test methods on the response of the specimen is more sensitive to internal damage;the whole specimen under shear and bending effects;2 cm specimen surface the following,RLWT specimen shear stress and shear strain was significantly greater than the APA specimens,RLWT test method is more focused on the shear properties of the specimen(evaluation.) Therefore,to evaluate shear performance of asphalt mixture core sample under high temperature,the preferred test method is RLWT.Research has important guiding significance to examine the compliance of high-temperature performance of asphalt pavement with design standards.