Lack of attention to the effect of laboratory conditions on the results of asphalt mixture tests, especially these of the warm mix asphalt (WMA), makes the analysis of results misleading. Thus herein, after examining the research on WMA and factors affecting test results in laboratory conditions, the effect of three parameters including short-term aging (asphalt binder storage in the oven), curing time (from construction to placement in the test chamber), and thermal equilibrium time (from placement in the test chamber to the test onset) were investigated on the characteristics of WMA at mid-temperature. To simultaneously examine these three factors, 36 modes were developed to evaluate their effect on the stiffness modulus and fatigue cracking, using the indirect tensile stiffness modulus test (ITSM) and indirect tensile fatigue test (ITFT), respectively. Results of the experiments showed that increasing the time of asphalt binder placement in the oven for 2–6 h significantly increased the stiffness modulus of the mixture, which reduced the fatigue life of the WMA. With increasing the curing time and improving the adhesion between asphalt binder and aggregates, the stiffness modulus and fatigue life of the specimens increased; however, by increasing the thermal equilibrium time, the stiffness modulus and fatigue life of the specimens decreased due to asphalt binder viscoelastic behavior and temperature sensitivity. Results of statistical analyses revealed that short-term aging, curing time, and thermal equilibrium time in laboratory conditions were effective on the stiffness modulus and fatigue life of WMA at a 95% confidence level.

缺乏对实验室条件对沥青混合料测试结果的影响的关注，尤其是对温拌沥青（WMA）的测试结果的影响，导致对结果的分析产生误导。因此，在这里，在检查了有关WMA的研究以及在实验室条件下影响测试结果的因素之后，研究了三个参数的影响，包括短期老化（沥青粘合剂在烤箱中的存储），固化时间（从构造到放置在测试室中），研究了中温下WMA的特性，并研究了热平衡时间（从放置在测试室到测试开始）。为了同时检查这三个因素，使用间接拉伸刚度模量试验（ITSM）和间接拉伸疲劳试验（ITFT）开发了36种模式，以评估它们对刚度模量和疲劳裂纹的影响，分别。实验结果表明，增加沥青粘合剂在烤箱中放置2–6 h的时间会显着增加混合物的刚度模量，从而降低WMA的疲劳寿命。随着固化时间的增加和沥青结合料与骨料之间的附着力的提高，试样的刚度模量和疲劳寿命增加。然而，由于沥青粘合剂的粘弹性和温度敏感性，通过增加热平衡时间，使试样的刚度模量和疲劳寿命降低。统计分析结果表明，实验室条件下的短期老化，固化时间和热平衡时间对WMA的刚度模量和疲劳寿命有效，置信度为95％。实验结果表明，增加沥青粘合剂在烤箱中放置2–6 h的时间会显着增加混合物的刚度模量，从而降低WMA的疲劳寿命。随着固化时间的增加和沥青结合料与骨料之间的附着力的提高，试样的刚度模量和疲劳寿命增加。然而，由于沥青粘合剂的粘弹性和温度敏感性，通过增加热平衡时间，使试样的刚度模量和疲劳寿命降低。统计分析结果表明，实验室条件下的短期老化，固化时间和热平衡时间对WMA的刚度模量和疲劳寿命有效，置信度为95％。实验结果表明，增加沥青粘合剂在烤箱中放置2–6 h的时间会显着增加混合物的刚度模量，从而降低WMA的疲劳寿命。随着固化时间的增加和沥青结合料与骨料之间的附着力的提高，试样的刚度模量和疲劳寿命增加。然而，由于沥青粘合剂的粘弹性和温度敏感性，通过增加热平衡时间，使试样的刚度模量和疲劳寿命降低。统计分析结果表明，实验室条件下的短期老化，固化时间和热平衡时间对WMA的刚度模量和疲劳寿命有效，置信度为95％。