It is important to control and predict the macroscopic properties through pore structure parameters of cement-based materials.\nMicroscopic pore structure of concrete has many characteristics, such as sizes and disordered distribution. It is necessary to use\nfractal theory to describe the pore structure of concrete. In order to establish the relationship between the pore structure\ncharacteristics of aerated concrete and porosity, shape factor, pore superficial area, average pore diameter, and average diameter,\nthe fractal dimension of the pore structure was used to evaluate the pore structure characteristics of aerated concrete. The X-ray\ncomputed tomography (CT) images of the aerated concrete block pore structure were obtained by using the XTH320 series X-ray\nthree-dimensional microscope. Thepore characteristics of aerated concrete block were studied according to Image-Pro Plus (IPP).\nBased on the research of the fractal dimension measurement methods, the proposed MATLAB program automatically determined\nthe fractal dimension of the aerated concrete block pore structure images. The research results indicated that the small pores\n(20 micromApprovimately60 microm) of aerated concrete block account for a large percentage compared with the large pores (60 micromApprovimately400 microm or more)\nfrom pore diameter distribution and the pore structure of aerated concrete block has obvious fractal features and the fractal\ndimension of aerated concrete block pore structure images were calculated to be in the range of 1.775-1.805. The pore fractal\ndimension has a strong correlation with the pore fractal characteristics of aerated concrete blocks. The fractal dimension of the\npore structure linearly increases with porosity, shape factor, and pore surface area. The fractal dimension of the pore structure\ndecreases with the average pore size and average diameter. Thus, the fractal dimension of the pore structure that is calculated by\nthe MATLAB program based on fractal theory can be assumed as the integrative evaluation index for evaluating the pore structure\ncharacteristic of aerated concrete block.
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