MATERIAL .S AND SUSTAINABL E DEVEL OPMENT: MATERIAL .S REMANUFACTURING AND WASTE RECYCLING |
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Stress-strain Constitutive Relation and Finite Element Analysis of Recycled Pebble Concrete After High Temperature Water Cooling |
CHEN Zongping1,2,*, XU Ruitian1, LIANG Houran1
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1 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China 2 Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China |
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Abstract In order to study the mechanical properties of recycled concrete (pebbles) after high-temperature water cooling, 60 standard cylinder test blocks were designed and manufactured with temperature and replacement rate as variable parameters, and uniaxial compression tests were carried out on them. The failure mode of the test block was observed, the load displacement curve of the whole process was obtained, and the constitutive equation of recycled concrete after high temperature water cooling was put forward, which was suitable for the finite element analysis of ABAQUS. The results show that: the recycled pebble concrete appears the phenomenon of looseness and bursting after high-temperature water cooling, and the burning loss rate increases positively at low temperature. The recycled concrete has lower peak stress and strain, but has better ductility than ordinary concrete. The proposed calculation method of RAC residual bearing capacity after high temperature spray cooling has certain applicability. Based on the experiment of 22 recycled concrete beams after high temperature water cooling, the constitutive equation considering temperature and substitution rate is applicable in ABAQUS.
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Published: 14 July 2021
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Fund:This work was financially supported by the National Natural Science Foundation of China (51578163), Special Fund Project for “Bagui” Scholars ([2019] No.79) and the Guangxi Science and Technology Base and Talent Project (Guike AD21075031). |
About author:: Zongping Chen serves in College of Civil Engineering and Architecture, Guangxi University. He is currently a professor and doctoral supervisor enjoying the special allowance from the State Council. He is national talents project candidates, the young and middle-aged experts with outstanding contributions, a winner of the national Baosteel excellent teacher award, the fifth batch of Bagui scholars in Guangxi Zhuang Autonomous Region, the ninth batch of excellent experts in Guangxi, an outstanding scholar in Guangxi universities, and an academic leader in the world-class discipline of civil engineering construction and national key discipline of structural engineering in Guangxi University. He is mainly engaged in teaching and research in structural engineering, disaster prevention and mitigation engineering and protection engineering. He has presided over more than 20 national and local key research and development projects, such as National Natural Science Foundation of China, Guangxi key research and development, Guangxi science and technology research and development, in marine and offshore concrete structure, composite constraint concrete structure, special-shaped column structure, steel-concrete composite and hybrid structure, recycled concrete structure, safety assessment and reinforcement of in-service engineering structure, fire resistance, disaster prevention and high temperature damage of structure, etc. His research achievements have won 2 second prizes of national science and technology progress, 2 second prizes of Guangxi science and technology progress, 1 second prize of Guangxi technology invention, 1 first prize of Shaanxi science and technology progress, 1 second prize of Shaanxi science and technology progress, 1 third prize of Guangxi natural science award, 1 second prize of science and technology progress of Shaanxi institutions of higher learning. He has published 3 personal works, 2 textbooks, 3 national industry standards, 1 local standards, 6 national invention patent, 21 utility model patents and nearly 150 SCI and EI retrieval papers in high-level journals at home and abroad, 9 of which have been selected as the top academic paper leader of Chinese top quality science and technology journals F5000, 2 of which have been selected as the high cited journal of buil-ding structure from 2012 to 2016, 1 of which was selected as the highly cited thesis of engineering mechanics in 2013—2018, and 1 of which was selected as one of the 100 most influential domestic academic papers in 2017. |
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