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Performance evaluation of high modulus asphalt mixtures for long life asphalt pavements

机译：高模量沥青混合料在长寿命沥青路面上的性能评估

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摘要

This paper describes the results of laboratory and full scale performance tests for a high modulus asphalt binder (HMAB) and mixes (HMAM) developed in this study for long life asphalt pavements. Various binder tests were first conducted on the HMAB and test results showed that the stiffness of the HMAB was significantly increased compared to the conventional binder without changing the low temperature properties of the binder. Laboratory tests for the mixes included dynamic modulus, moisture susceptibility, wheel tracking and fatigue tests. Dynamic modulus test results showed that the modulus of the HMAM was 50% higher than those of the conventional mix at the high temperatures. The results of performance test indicated that the resistances of the HMAM against moisture, rutting, and fatigue damage were better than those of the conventional mix. It was also found from the full scale test sections that the tensile strain values at the bottom of the asphalt layer for the HMAM sections were lower than those of the conventional mix sections although the asphalt layer thicknesses of the HMAM sections were thinner than those of the conventional sections. All the tensile strain values measured from the HMAM sections were within the fatigue endurance limit of 70 microstrain which is the fatigue criterion of a long life asphalt pavement. Similar to the wheel tracking test results, the rut depth occurred in the thick HMAM test section was two times smaller than the conventional pavement section.
机译：本文介绍了针对高寿命沥青路面的高模量沥青粘合剂（HMAB）和混合料（HMAM）的实验室和全面性能测试的结果。首先对HMAB进行了各种粘合剂测试，测试结果表明，与传统粘合剂相比，HMAB的刚度显着提高，而没有改变粘合剂的低温性能。混合物的实验室测试包括动态模量，湿气敏感性，车轮跟踪和疲劳测试。动态模量测试结果表明，在高温下，HMAM的模量比常规混合物的模量高50％。性能测试的结果表明，HMAM的耐湿，车辙和疲劳损伤性能优于传统混合物。从全尺寸测试部分还发现，尽管HMAM部分的沥青层厚度比HMAM部分的沥青层厚度薄，但HMAM部分的沥青层底部的拉伸应变值低于常规混合部分。常规部分。从HMAM截面测得的所有拉伸应变值都在70微应变的疲劳耐久性极限内，这是长寿命沥青路面的疲劳标准。与车轮跟踪测试结果相似，在较厚的HMAM测试段中发生的车辙深度比传统的路面段小两倍。

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