Acoustic Emission Properties of Concrete Slab During Fatigue Testing with a Running-Wheel Load
Acoustic Emission Properties of Concrete Slab During Fatigue Testing with a Running-Wheel Load作者机构：National Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan Nippon Physical Acoustics Ltd. Tokyo 150-0011 Japan Department of Civil Engineering College of Engineering Nihon University Koriyama Fukushima 963-1165 Japan Institute of Industrial Science The University of Tokyo Tokyo 153-8505 Japan
出 版 物：《Journal of Civil Engineering and Architecture》 (土木工程与建筑（英文版）)
年 卷 期：2017年第11卷第3期
页 面：213-221页
学科分类：08[工学] 081402[工学-结构工程] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0814[工学-土木工程]
主 题：Acoustic emission concrete slab waveguide fatigue testing running-wheel load.
摘 要：AE （acoustic emission） signals from concrete slab during fatigue testing with a running-wheel load were evaluated. The signals were recorded by remote sensors connected to a computer network. The sensing equipment consisted of 60 kHz resonant-type AE sensors mounted on a reinforcing steel bar as a waveguide, together with a 16-channel sensor highway AE system. Because the detected AE signals included periodic mechanical noise from the motion of the wheel, these noises were eliminated by means of signal processing. The AE waveguide measurement over a length of 3 m detected fractures as vertical and horizontal cracks in the RC （reinforced concrete） slab. Those cracks were analyzed by correlating AE parameters with macroscopic distortions and the numbers of fatigue cycles. In the AE events and AE energy, two types of AE phenomena, active region and inactive region, were observed during fatigue testing. The vertical cracks were characterized by an AE amplitude of 58 dB, a peak frequency of 30 kHz, and a ratio of the rise time to the maximum amplitude value （RA） of 100. The horizontal cracks were characterized by an AE amplitude of 85 dB, a peak frequency of 60 kHz, and an RA value of 10.
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