Study on Pore Characteristics of Recycled Aggregate Concrete at High Temperature Based on 3D Reconstruction of CT Images
DU Sizhe1, ZHANG Miao2, ZHANG Yu1, Selyutina Nina3, Smirnov Ivan3, MA Shujuan1, DONG Xiaoqiang1, LIU Yuanzhen1,*
1 College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2 Coronation Property Co. Pty Ltd/MN Builders, New South Wales 2620, Australia 3 Saint Petersburg State University, St. Petersburg 190000, Russia
Abstract: High temperatures can lead to deterioration of concrete microstructure damage, which in turn leads to a decrease in concrete mechanical pro-perties. In this work, computerized tomography (CT) technology was used to identify the pore structure characteristics of recycled aggregate concrete mixed with glazed hollow beads (GHB-RAC) specimens after high temperature. The characteristic parameters of concrete pore structure were extracted and analyzed based on CT scanning and three-dimensional reconstruction modelling. And the gray correlation theory was applied to investigate the influence degree of the pore structure characteristic parameters on the residual comprehensive strength of concrete. The results show that the internal pore structure of GHB-RAC can be affected by temperature; the internal pore size and surface area increase with temperature; and the temperature increase affects the concrete pore homogeneity and intensifies the distribution of pore in-homogeneity. With the incorporation of GHB, the pore structure of concrete improved effectively and reduces the pore distortion caused by high temperature. The gray correlation between pore size, pore sphericity and residual compressive strength is above 0.55, which indicates a great correlation between pore structure and residual comprehensive strength.
都思哲, 张淼, 张玉, Selyutina Nina, Smirnov Ivan, 马树娟, 董晓强, 刘元珍. 基于CT图像三维重建的高温下再生混凝土孔隙特征研究[J]. 材料导报, 2024, 38(5): 22060128-11.
DU Sizhe, ZHANG Miao, ZHANG Yu, Selyutina Nina, Smirnov Ivan, MA Shujuan, DONG Xiaoqiang, LIU Yuanzhen. Study on Pore Characteristics of Recycled Aggregate Concrete at High Temperature Based on 3D Reconstruction of CT Images. Materials Reports, 2024, 38(5): 22060128-11.
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2024, Vol. 38 
