In order to get the characteristics of crack formation on a concrete surface, a coupled method of industrial cameras and gray‐level co‐occurrence matrices (GLCM) is used to analyze the formation of magnesium oxychloride cement concrete surface cracks. This method requires fewer samples than the previous edge detection method, typing analysis, and artificial neural network method and can provide more damage parameter information without being limited to the geometric information of local features. According to the GLCM analysis of the surface crack formation of concrete under the effect of a rust expansion force, it is concluded that the larger the concrete protective layer, the longer the energization time required. When the concrete surface crack reaches 0.2 mm, the test pieces with protective layers of 14, 24, 34, and 44 mm need to be energized for 270, 465, 673, and 792 hr, respectively. With the increase of cracks on the concrete surface, the contrast keeps increasing, while the correlation, energy, and homogeneity gradually decrease. In color heat maps, the number of matrix peaks gradually increases with the formation of cracks, and the bandwidth of the horizontal projection of matrix peaks gradually decreases, and there is a tendency to extend along the main diagonal of the matrix. The selection of the size of the region of interest region will have a certain impact on the size of the four eigenvalues in GLCM, but it will not change its development law.

中文翻译：

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用灰阶共现矩阵分析钢腐蚀引起的氯氧化镁水泥混凝土表面损伤演化

为了获得混凝土表面裂缝形成的特征，采用工业相机和灰度共现矩阵（GLCM）的耦合方法来分析氯氧化镁水泥混凝土表面裂缝的形成。该方法比以前的边缘检测方法，类型分析和人工神经网络方法所需的样本更少，并且可以提供更多的损伤参数信息，而不受限于局部特征的几何信息。根据在锈胀力作用下混凝土表面裂纹形成的GLCM分析，可以得出结论，混凝土保护层越大，所需的通电时间越长。当混凝土表面裂缝达到0.2毫米时，试件的保护层为14、24、34，和44毫米分别需要通电270、465、673和792小时。随着混凝土表面裂缝的增加，对比度不断提高，而相关性，能量和均匀性逐渐降低。在彩色热图中，随着裂纹的形成，基质峰的数量逐渐增加，并且基质峰的水平投影的带宽逐渐减小，并且存在沿基质的主对角线延伸的趋势。感兴趣区域区域大小的选择将对GLCM中四个特征值的大小产生一定的影响，但不会改变其发展规律。在彩色热图中，随着裂纹的形成，基质峰的数量逐渐增加，并且基质峰的水平投影的带宽逐渐减小，并且存在沿基质的主对角线延伸的趋势。感兴趣区域区域大小的选择将对GLCM中四个特征值的大小产生一定的影响，但不会改变其发展规律。在彩色热图中，随着裂纹的形成，基质峰的数量逐渐增加，并且基质峰的水平投影的带宽逐渐减小，并且存在沿基质的主对角线延伸的趋势。感兴趣区域区域大小的选择将对GLCM中四个特征值的大小产生一定的影响，但不会改变其发展规律。