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Yue Li,Xiongfei Liu,Zigeng Wang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.4
In this research, Magnesium Phosphate Cement (MPC) was innovatively used to bond with Carbon Fiber Reinforced Plastic (CFRP) in order to form the MPC-CFRP as a composite material, adopted both for chloride ions extraction and reinforcement of concrete columns. First of all, a series of tests were conducted to evaluate the feasibility of the MPC-CFRP as anode of Electrochemical Chloride Extraction (ECE) system, including chloride ions concentration, Scanning Electron Microscope (SEM) and tensile strength. Then, the MPC-CFRP was used to wrap around reinforced concrete column for the sake of reinforcement and extraction of chloride ions. The test results indicated that the chloride extraction efficiency and the tensile resistance of the MPCCFRP electrode were superior to the control group. The ECE process can decrease the interface bonding strength between the concrete and the steel rebar while the compression resistance of the columns could be increased remarkably. Therefore, the MPCCFRP composite material is capable of achieving the dual functions of strengthening and repairing the reinforced concrete construction.
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Investigation on Mechanical Properties of Masonry Infill Wall Strengthened with ECC
Yue Li,Jincai Zhu,Zigeng Wang 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.1
Engineered Cementitious Composite (ECC) is an advanced composite material with strain-hardening and multiple-cracking behaviors. In this study, two types of ECC materials were troweled on masonry infill walls strengthened with expansion bolt and interfacial agent. The seismic performance of the unreinforced and the ECC reinforced masonry structures was evaluated by the reversed cyclic loading test. The results showed that the application of the ECC on the masonry infill walls can improve the ultimate bearing capacity (in plane), ductility, stiffness and accumulative energy dissipation of the structure. Compared with the masonry structure with one side reinforced by the ECC, the structure with both sides reinforced by the ECC could better improve the ultimate bearing capacity, stiffness and cumulative energy dissipation with little difference on the ductility improvement. Moreover, the expansion bolt and the interfacial agent used to improve the connection between the ECC and the masonry structure have the ability to greatly increase the mechanical properties of the structure under cyclic loading.
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Yue Li,Jianglin Liu,Zigeng Wang,Ji Hao 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.8
The magnesium phosphate cement (MPC)-carbon fiber reinforced plastics (CFRP) strengtheningand electrochemical chloride extraction (ECE) integration experiment was carried out for reinforced concrete beams corroded by sodium chloride. Then the bending performance of the reinforced concrete beams was analyzed by test and numerical simulation. The reinforced concrete beams of the control group were energized to accelerate corrosion until the theoretical corrosion rate of the steel bars reached 10%. The second group of the beams were strengthened, and the other three groups of the beams were strengthened and the inside chloride was removed by electrochemistry method with different dechlorination current densities. The bending test results showed that the bending bearing capacity of the strengthenedconcrete beam increased by 18.22%. The bending bearing capacity of the strengthened and dechlorinated beam increased by 15.11%, 13.25% and 9.76%, respectively. The chloride ion content at the interface between steel bar and concrete reduced by 68.68% − 82.64%. In addition, the numerical simulation method of "standard cube test block-central pull out test block-reinforced concrete beam" was proposed. A 3D mesoscopic finite element plastic damage model of the reinforced concrete beams strengthened by MPC-CFRP was established. The numerical results were in good agreement with the experimental results.
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