Electrical resistance tomography detection of concrete cracks based on sensor coatings
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摘要: 为验证传感涂层在钢筋混凝土梁电阻层析成像技术(ERT)裂缝检测中的可行性,提高裂缝的ERT检测精度,首先通过试验获得传感涂层力学性能与电学性能的相关性,再将传感涂层用于采集钢筋混凝土梁三点弯曲试验过程中的电势差数据,最后用差分ERT算法对混凝土梁裂缝进行成像检测。试验结果表明,传感涂层的力学韧性及其与混凝土的连接性较好,应变小于0. 35%时应变与电导率呈线性相关,裂缝处传感涂层未出现脱离现象,ERT检测的原始数据可靠性较高。差分算法重建图像可提供混凝土裂缝的定性信息,能可视化检测出裂缝的位置及分布形态,较传统的直接ERT混凝土缺陷检测方法精度更高,实用性更强。Abstract: In order to verify the feasibility of sensing coating in crack detection of reinforced concrete beam by electrical resistance tomography (ERT) and improve the ERT detection accuracy of cracks, firstly, the correlation between mechanical properties and electrical properties of sensing coating was obtained through experiments. Then, the sensing coating was used to collect the potential difference data of reinforced concrete beam during three-point bending test. Finally, the differential ERT algorithm was used to detect the cracks of concrete beam. The test results showed that the mechanical toughness of the sensing coating and its connection with concrete were good. When the strain was less than 0.35%, it was linearly related to the conductivity. The sensing coating at the crack did not appear to be detached, and the reliability of the original data of ERT detection was greatly improved. The reconstructed image of the difference algorithm can provide qualitative information of concrete cracks, and can visually detect the location and distribution of cracks. Compared with the traditional direct ERT method, the method of detecting concrete defects was more accurate and practical.
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