中文摘要：

利用实验室现有的闭环控制加载试验机、INV智能信号采集分析处理仪、动态电阻应变仪、电涡流位移传感器等设备和元器件组合设计出一套基于非接触方法的沥青混凝土动态模量的测试系统,并对测试结果的可靠性进行了验证。在测试AC-13C型沥青混凝土小梁四点弯曲动态试验中,由应力-应变波形确定的动态模量和相位角,在测试温度为-15、0、15℃,应力比为0.2、0.3、0.4、0.5以及加载频率为1、5、10 Hz等工况情况下,其动态模量和滞后相位角产生明显的变化：温度越高,加载频率、应力比越小,动态模量值最小只有158 MPa;温度越低,加载频率、应力比越小,滞后相位角最小只有3.2°。反之,温度越低,加载频率、应力比越大,动态模量最大达2 235 MPa;温度越高,加载频率、应力比越大,滞后相位角最大达47.3°。研究成果可以为准备便捷地进行沥青混凝土动态模量试验提供一种有益的手段。

英文摘要：

Asphalt concrete is a non-homogeneous and visco-elastic material. Currently, foreign equipment, such as MTS and TUM series of dynamic test systems are expensive. Also, there is no mature and reliable equipment made in China. Therefore, a non-contact testing system was designed in this paper. It is composed of the closed-loop control laboratory test system, IN- intelligent signal acquisition and analysis processing device, the dynamic resistance strain gauge, eddy current displacement sensors and other equipments. The system can measure the dynamic modulus of asphalt concrete using existing equipments in laboratory. The reliability of test results was also validated. In the dynamic performance test about AC-13C asphalt concrete, its dynamic modulus and phase angle determined by the stress-strain waveform evidently changed with the test temperature, the stress ratio, the loading frequency and other conditions. When the test temperature of - 15 -C ,0 ℃ , 15 ℃ , test ratio of 0.2,0.3,0.4,0.5 and loading frequency of 1, 5 and 10 Hz, the dynamic modulus and hysteresis phase angles were changed obviously. The minimum and maximum dynamic modulus were 158 MPa and 2 235 MPa, the minimum and maximum hysteresis phase angles were 3.2°and 47.3°, respectively. The research result can provide a tool to accurately and conveniently conduct the dynamic modulus test for asphalt concrete.