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首页> 外文期刊>Arabian Journal for Science and Engineering >Rutting Evaluation of Asphalt Mixtures Using Static, Dynamic, and Repeated Creep Load Tests
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Rutting Evaluation of Asphalt Mixtures Using Static, Dynamic, and Repeated Creep Load Tests

机译：使用静态，动态和重复蠕变载荷试验评估沥青混合料的车辙

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Flow tests (flow number and flow time) are explicatory indices for the evaluation of the rutting potential of asphalt mixtures. This study investigates the rutting susceptibility of various asphalt mixtures subjected to static and dynamic creep tests. Four wearing course gradations were selected; and asphalt mixture's specimens were fabricated using Superpave gyratory compactor. The flow tests were performed at a single effective temperature of 54.4 degrees C and a stress level of 300 kPa using asphalt mixture performance tester. Dynamic modulus (vertical bar E*vertical bar) test was conducted at different temperatures and frequency levels. The test results indicate that specimens of mixtures experienced tertiary flow state in the flow number (FN) test, but no specimen achieved tertiary flow state in the flow time (FT) test. Data smoothening technique was employed for removing the resonance from the raw test data. The performance of mixtures was compared using: (a) FN values; (b) number of cycles at which the 50,000 microstrains occurred; and (c) intercept obtained from regression analysis of total permanent strain. The observed accumulated axial strains at time of termination were used for comparison purpose of mixtures as tertiary phase was not achieved in FT tests. Three statistical models were developed of the different functional formulation-i.e. Cobb-Douglas, power and first-order multiple linear regression-using vertical bar E*vertical bar, FN, and mix volumetric data. The laboratory results were used to rank the mixtures based on their resistance to rutting. The findings of the study are envisaged to facilitate the implementation of performance-based mechanistic-empirical pavement design approach.
机译：流动测试（流动数和流动时间）是用于评估沥青混合料车辙潜力的解释性指标。这项研究调查了经过静态和动态蠕变测试的各种沥青混合料的车辙敏感性。选择了四个佩戴过程等级；用Superpave旋转压实机制备沥青混合料的标本。使用沥青混合料性能测试仪在54.4摄氏度的单个有效温度和300 kPa的应力水平下进行了流动测试。在不同温度和频率水平下进行动态模量（垂直线E *垂直线）测试。测试结果表明，混合物样品在流量数（FN）测试中经历了三次流动状态，但在流动时间（FT）测试中没有样品达到三次流动状态。数据平滑技术用于从原始测试数据中消除共振。使用以下方法比较混合物的性能：（a）FN值； （b）50,000个微应变发生的周期数； （c）从总永久应变的回归分析获得的截距。终止时观察到的累积轴向应变用于比较混合物，因为在FT测试中未达到第三相。针对不同功能配方开发了三个统计模型-即Cobb-Douglas，幂和一阶多元线性回归-使用垂直线E *垂直线，FN和混合体积数据。实验室结果用于根据混合物的抗车辙性对其进行排名。设想该研究的结果可促进基于性能的机械-经验路面设计方法的实施。

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