Three-Dimensional Multi-Phase Microscopic Simulation of Service Life of Recycled Large Aggregate Self-Compacting Concrete  

作　　者：Jing Li Lina Gao Libo Liu Liao Zhang Jianhua Zheng Jing Gao Jing Li;Lina Gao;Libo Liu;Liao Zhang;Jianhua Zheng;Jing Gao(College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, China;China Huanqiu Contracting & Engineering Co., Ltd., Beijing, China;School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing, China;The Fourth Construction Co., Ltd. of China Construction Eighth Engineering Division, Qingdao, China)

机构地区：[1]College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, China [2]China Huanqiu Contracting & Engineering Co., Ltd., Beijing, China [3]School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing, China [4]The Fourth Construction Co., Ltd. of China Construction Eighth Engineering Division, Qingdao, China

出　　处：《Journal of Materials Science and Chemical Engineering》2024年第4期126-135,共10页材料科学与化学工程（英文）

摘　　要：Recycled large aggregate self-compacting concrete (RLA-SCC) within multiple weak areas. These weak areas have poor resistance to chloride ion erosion, which affects the service life of RLA-SCC in the marine environment. A three-dimensional multi-phase mesoscopic numerical model of RLA-SCC was established to simulate the chloride ions transportation in concrete. Experiments of RLA-SCC immersing in chloride solution were carried out to verify the simulation results. The effects of recycled large aggregate (RLA) content and RLA particle size on the service life of concrete were explored. The results indicate that the mesoscopic numerical simulation results are in good agreement with the experimental results. At the same depth, the closer to the surface of the RLA, the greater the chloride ion concentration. The service life of RLA-SCC in marine environment decreases with the increase of RLA content. Compared with the service life of 20% content, the service life of 25% and 30% content decreased by 20% and 42% respectively. Increasing the particle size of RLA can effectively improve the service life of RLA-SCC in chloride environment. Compared with the service life of 50 mm particle size, the service life of 70 mm and 90 mm increased by 61% and 163%, respectively. .Recycled large aggregate self-compacting concrete (RLA-SCC) within multiple weak areas. These weak areas have poor resistance to chloride ion erosion, which affects the service life of RLA-SCC in the marine environment. A three-dimensional multi-phase mesoscopic numerical model of RLA-SCC was established to simulate the chloride ions transportation in concrete. Experiments of RLA-SCC immersing in chloride solution were carried out to verify the simulation results. The effects of recycled large aggregate (RLA) content and RLA particle size on the service life of concrete were explored. The results indicate that the mesoscopic numerical simulation results are in good agreement with the experimental results. At the same depth, the closer to the surface of the RLA, the greater the chloride ion concentration. The service life of RLA-SCC in marine environment decreases with the increase of RLA content. Compared with the service life of 20% content, the service life of 25% and 30% content decreased by 20% and 42% respectively. Increasing the particle size of RLA can effectively improve the service life of RLA-SCC in chloride environment. Compared with the service life of 50 mm particle size, the service life of 70 mm and 90 mm increased by 61% and 163%, respectively. .

关 键 词：Recycled Large Aggregate Self-Compacting Concrete Mesoscopic Mode Chloride Ion Diffusion Numerical Analysis 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]