Pan Wen-Hao, Sun Xu-Dong, Wu Li-Mei, Yang Kai-Kai, Tang Ning
School of Materials Science and Engineering, Northeast University, Shenyang 110819, China.
School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China.
Materials (Basel). 2019 Jan 31;12(3):443. doi: 10.3390/ma12030443.
Asphalt concrete has been widely used in road engineering as a surface material. Meanwhile, ultrasonic testing technology has also been developed rapidly. Aiming to evaluate the feasibility of the ultrasonic wave method, the present work reports a laboratory investigation on damage detection of asphalt concrete using piezo-ultrasonic wave technology. The gradation of AC-13 was selected and prepared based on the Marshall's design. The ultrasonic wave velocities of samples were tested with different environmental conditions firstly. After that, the samples were destroyed into two types, one was drilled and the other was grooved. And the ultrasonic wave velocities of pretreated samples were tested again. Furthermore, the relationship between velocity and damaged process was evaluated based on three point bending test. The test results indicated that piezoelectric ultrasonic wave is a promising technology for damage detection of asphalt concrete with considerable benefits. The ultrasonic velocity decreases with the voidage increases. In a saturated water environment, the measured velocity of ultrasonic wave increased. In a dry environment (50 °C), the velocity the ultrasonic waves increased too. After two freeze-thaw cycles, the voidage increased and the ultrasonic velocity decreased gradually. After factitious damage, the wave must travel through or most likely around the damage, the ultrasonic velocity decreased. During the process of three point bending test, the ultrasonic velocity increased firstly and then decreased slowly until it entered into a steady phase. At last the velocity of ultrasonic wave decreased rapidly. In addition, the errors of the results under different test conditions need to be further studied.
沥青混凝土作为一种路面材料已在道路工程中得到广泛应用。与此同时，超声检测技术也得到了迅速发展。为了评估超声波法的可行性，本研究报告了一项利用压电超声波技术对沥青混凝土损伤检测的实验室研究。基于马歇尔设计选择并制备了AC - 13级配。首先在不同环境条件下测试了样品的超声波速度。之后，将样品破坏成两种类型，一种是钻孔，另一种是开槽。然后再次测试预处理后样品的超声波速度。此外，基于三点弯曲试验评估了速度与损伤过程之间的关系。试验结果表明，压电超声波是一种用于沥青混凝土损伤检测的有前景的技术，具有显著优势。超声波速度随空隙率增加而降低。在饱和水环境中，测得的超声波速度增加。在干燥环境（50℃）下，超声波速度也增加。经过两次冻融循环后，空隙率增加，超声波速度逐渐降低。人为损伤后，波必须穿过或很可能绕过损伤部位，超声波速度降低。在三点弯曲试验过程中，超声波速度先增加，然后缓慢降低，直到进入稳定阶段。最后超声波速度迅速降低。此外，不同试验条件下结果的误差需要进一步研究。
