MPC粘结CFRP为阳极对锈蚀钢筋混凝土电化学除氯的研究
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摘要
采用磷酸镁水泥(MPC)粘结碳纤维布(CFRP)作为电化学阳极,对锈蚀钢筋混凝土柱进行电化学除氯。研究了锈蚀钢筋混凝土柱在不同电流密度下的电化学除氯效率、距钢筋不同距离处氯离子分布。结果表明:同一电流密度下,钢筋锈蚀率15%和30%混凝土柱的除氯效率明显大于自然锈蚀和锈蚀率5%的混凝土柱;对于相同锈蚀率的钢筋混凝土,除氯效率随着电流密度的增大而增大;除氯后,混凝土中距钢筋不同位置处的残余氯离子浓度由内到外呈递增趋势,混凝土中各区域残余氯离子随电流密度的增加而降低。
Using magnesium phosphate cement( MPC) bonded carbon fiber reinforced polymer( CFRP) as an electrochemical anode for electrochemical dechlorination of corroded reinforced concrete columns. The electrochemical removal efficiency of the reinforced concrete column under different current density and the chlorine ion distribution at different distances of the steel bars were studied. The results show that under the same current density,the removal efficiency of the reinforcement corrosion rate of 15% and30% of concrete columns is significantly higher than that of the concrete column with 5% and the natural rust of corrosion rate. For reinforced concrete with the same corrosion rate,the efficiency of chlorine removal increases with the increase of current density. After removing chlorine,the residual chlorine ion concentration in different positions of the concrete is increasing from inside to outside,and the residual chlorine ion in the concrete is reduced with the increase of current density.
Using magnesium phosphate cement( MPC) bonded carbon fiber reinforced polymer( CFRP) as an electrochemical anode for electrochemical dechlorination of corroded reinforced concrete columns. The electrochemical removal efficiency of the reinforced concrete column under different current density and the chlorine ion distribution at different distances of the steel bars were studied. The results show that under the same current density,the removal efficiency of the reinforcement corrosion rate of 15% and30% of concrete columns is significantly higher than that of the concrete column with 5% and the natural rust of corrosion rate. For reinforced concrete with the same corrosion rate,the efficiency of chlorine removal increases with the increase of current density. After removing chlorine,the residual chlorine ion concentration in different positions of the concrete is increasing from inside to outside,and the residual chlorine ion in the concrete is reduced with the increase of current density.
引文
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[11] Al-Saidy A H,Al-Harthy A S,Al-Jabri K S. Structural performance of corroded RC beams repaired with CFRP sheets[J]. Composite Structures,2010,92:1931-1938.
[12] Pérez A,Climent M A,Garcés P. Electrochemical extraction of chlorides from reinforced concrete using a conductive cement paste as the anode[J]. Corrosion Science,2010,52(5):1576-1581.
[2] Garcés P,Sánchez de Rojas M J,Climent M A. Effect of the reinforcement bar arrangement on the efficiency of electrochemical chloride removal technique applied to reinforced concrete structures[J]. Corros. Sci.,2006,48(3):531-545.
[3] Sánchez de Rojas M J,Garcés P,Climent M A. Electrochemical extraction of chlorides from reinforced concrete:variables affecting treatment efficiency[J]. Materiales de Construcción,2006,56(284):17-26.
[4] Cervantes P M J,Carlos B,Rosa N,et al. Conductive cement pastes with carbon fibers as anodes in electrochemical chloride extraction[J].Corrosion Science,2015,10(5):3830-3840.
[5] Zhu J H,Wei L,Wang Z,et al. Application of carbon-fiber-reinforced polymer anode in electrochemical chloride extraction of steel-reinforced concrete[J]. Construction and Building Materials,2016,120:275-283.
[6] Li Y,Chen B. Factoers that affect the properties of magnesium phosphate cement[J]. Construction and Building Materials,2013,47:977-983.
[7] Li Y,Li Y Q,Shi T F,et al. Experimental study on mechanical properties and fracture toughness of magnesium phosphate cemnet[J]. Construction and Building Materials,2015,96:346-352.
[8] Li Y,Sun J,Li J Q,et al. Effects of fly ash,retarder and calcination of magnesia on properties of magnesia-phosphate cement[J]. Advances in CenmentResearch,2015,27(7):373-380.
[9] Li Y,Shi T F,Chen B,et al. Performance of magnesium phosphate cement at elevated temperatures[J]. Construction and Building Materials,2015,91:126-132.
[10] Li Y,Bai W L,Shi T F,et al. Research on axial compression test of CFRP confined concrete column with MPC[J]. Journal of Beijing University of Technology,2017,43(3):467-472.
[11] Al-Saidy A H,Al-Harthy A S,Al-Jabri K S. Structural performance of corroded RC beams repaired with CFRP sheets[J]. Composite Structures,2010,92:1931-1938.
[12] Pérez A,Climent M A,Garcés P. Electrochemical extraction of chlorides from reinforced concrete using a conductive cement paste as the anode[J]. Corrosion Science,2010,52(5):1576-1581.