CNT-CF水泥基材料辅助阳极对钢筋混凝土阴极保护影响  

Effect of CNT-CF Cement-Based Materials Auxiliary Anode on Cathodic Protection of Reinforced Concrete

作　　者：左俊卿 姚武[3] 

机构地区：[1]上海建工集团股份有限公司,上海200080 [2]上海高大结构高性能混凝土工程技术研究中心,上海201114 [3]同济大学先进土木工程材料教育部重点实验室,上海201804

出　　处：《建筑材料学报》2016年第3期424-429,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51508320;50978200);"十二五"国家科技支撑计划项目(2014BAJ03B02);上海市青年科技启明星计划资助项目(16QB1402000);先进土木工程材料教育部重点实验室(同济大学)开放基金资助项目(201503);上海市科学技术委员会项目(14DZ2252100)

摘　　要：应用腐蚀电位、腐蚀电流密度和交流阻抗谱,研究了碳纳米管(CNT)-碳纤维(CF)水泥基材料铺覆层作为辅助阳极对混凝土中钢筋的阴极保护效果.结果表明:所施加的电流能引起钢筋电位足够的负移,从而有效地保护钢筋.与碳纤维水泥基材料相比,采用CNT-CF水泥基材料作为辅助阳极来实施阴极保护的钢筋试样腐蚀电流密度更小,保护效果更佳.随着龄期的增长,在实施阴极保护钢筋试样的Nyquist图中,中频区容抗弧半径增大,电荷转移电阻增大.采用CNT-CF水泥基材料铺覆层作为辅助阳极对混凝土中钢筋的阴极保护具有显著的增强效果.Corrosion potential,corrosion current density and AC impedance spectroscopy were applied to study the efficiency of cathodic protection to steel in concrete structures with carbon nanotube-carbon fiber（CNT-CF）cement-based materials overlay auxiliary anodes.Test results show that the applied electric current could cause enough negative potential shift and provide effective protection to steel.Compared to carbon fiber cement-based materials,corrosion current density of cathodic protection specimens with CNTCF cement-based materials overlay as auxiliary anodes is smaller and the protective effect is better.The capacitive loop diameter of Nyquist figure in the intermediate frequency region and the charge transfer resistance of specimen under cathodic protection both increase.Using CNT-CF cement-based materials overlay as auxiliary anodes has a prominent effect on cathodic protection of steel in concrete structures.

关 键 词：碳纳米管-碳纤维水泥基材料 阳极 钢筋混凝土 阴极保护 

分 类 号：TU528.01[建筑科学—建筑技术科学]