氯离子对混凝土中钢筋锈蚀行为的影响
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摘要
采用线性极化和交流阻抗测试技术,结合钢筋腐蚀电位监测,研究氯离子含量对混凝土中钢筋锈蚀行为的影响,分析不同氯离子含量对钢筋的锈蚀速率。结果表明,混凝土中氯离子含量越大,钢筋腐蚀电位越低,腐蚀电流密度越大;当混凝土中氯离子含量为0.06%时,钢筋腐蚀电流密度大于0.1μA/cm2,钢筋保护膜已经破钝,当混凝土中氯离子含量为0.3%时,钢筋腐蚀电流密度超过1μA/cm2,腐蚀速率为氯离子含量为0.06%混凝土中钢筋的4～5倍。
The linear polarization and AC impedance testing techniques are combined with the corrosion potential monitoring of rebar to study the effect of chloride ion content on the corrosion behavior of rebar in the concrete, and the corrosion rate of rebar with different chloride ion content is analyzed.The results show that the higher the chlo-ride ion content in the concrete, the lower the corrosion potential of the rebar, while the higher the corrosion current density;When the chloride ion content in the concrete is 0.06%, the corrosion current density of the rebar is greater than 0.1μA/cm~2, and the protective film of the rebar has already been broken. When the chloride ion content in the concrete is 0.3%, the corrosion current density of the rebar exceeds 1μA/cm~2, and the corrosion rate is 4～5 times of the rebar in the concrete with 0.06% chloride content.
The linear polarization and AC impedance testing techniques are combined with the corrosion potential monitoring of rebar to study the effect of chloride ion content on the corrosion behavior of rebar in the concrete, and the corrosion rate of rebar with different chloride ion content is analyzed.The results show that the higher the chlo-ride ion content in the concrete, the lower the corrosion potential of the rebar, while the higher the corrosion current density;When the chloride ion content in the concrete is 0.06%, the corrosion current density of the rebar is greater than 0.1μA/cm~2, and the protective film of the rebar has already been broken. When the chloride ion content in the concrete is 0.3%, the corrosion current density of the rebar exceeds 1μA/cm~2, and the corrosion rate is 4～5 times of the rebar in the concrete with 0.06% chloride content.
引文
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[14] JGJ/T 152—2008混凝土中钢筋检测技术规程[S].北京:中国建筑工业出版社, 2008.
[15]王小刚,史才军,何富强,等.氯离子结合及其对水泥基材料微观结构的影响[J].硅酸盐学报, 2013(2):187-198.
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[17]李庆玲,史才军,何富强,等.水泥基材料中自由氯离子浓缩的影响因素[J].硅酸盐学报, 2013(3):320-327.
[18]魏宝明.金属腐蚀理论及应用[M].北京:北京工业出版社, 1984.
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[2]陈蔚凡.盐渍地区混凝土建筑物的耐久性[M].北京:中国建筑工业出版社, 2003.
[3]姜海西,肖汝诚.沿海及跨海桥梁下部结构防腐与加固[J].结构工程师, 2008, 24(4):125-131.
[4]王文铮,王洋,邹友林.钢筋混凝土桥梁结构耐久性问题及对策[J].广州建筑, 2006(6):11-14.
[5]吴萌顺.电化学保护和缓独剂应用技术[M].化学工业出版社, 2005.
[6]乔国富.混凝土结构钢筋腐烛的电化学特征与监测传感器系统[D].哈尔滨工业大学, 2008.
[7] Richard. E.W. Service life model for concrete structures in chloride laden environments[J], ACI Materials Journal,1998, 95(4):405-411.
[8]金祖权.西部地区严酷环境下混凝土的耐久性与寿命预测[D].东南大学, 2006.
[9]许晨,王传坤,金伟良.混凝土中氯离子侵烛与碳化的相互影响研究[J].建筑材料学报, 2011(3):376-380.
[10]杨集川.钢筋保护层厚度检测技术探讨[J].广州建筑, 2018, 46(2):14-17.
[11] LEELALERKIET V, KYUNG J W, OHTSU M, et al.Analysis of half-cell potential measurement for corrosion of reinforced concrete[J]. Construction and Building Materials, 2004, 18(3):155-162.
[12]姬永生,徐从宇,王磊,等.混凝土中钢筋腐蚀过程的温湿度综合效应[J].土木建筑与环境工程, 2012, 34(1):12-16.
[13]吴瑾,张兴才,汪中.环境温度和湿度对混凝土中钢筋腐蚀电位影响的试验研究[J].混凝土, 2016(9):9-11.
[14] JGJ/T 152—2008混凝土中钢筋检测技术规程[S].北京:中国建筑工业出版社, 2008.
[15]王小刚,史才军,何富强,等.氯离子结合及其对水泥基材料微观结构的影响[J].硅酸盐学报, 2013(2):187-198.
[16]王绍东,黄煜镔,王智.水泥组分对混凝土固化氯离子能力的影响[J].硅酸盐学报, 2000, 28(6):570-574.
[17]李庆玲,史才军,何富强,等.水泥基材料中自由氯离子浓缩的影响因素[J].硅酸盐学报, 2013(3):320-327.
[18]魏宝明.金属腐蚀理论及应用[M].北京:北京工业出版社, 1984.
[19]梁成浩.金属腐蚀学导论[M].北京:机械工业出版社, 1999.
[20] Andrade C., Alonso C. Corrosion rate monitoring in the laboratory andon site[J]. Construction and Building Materials, 1996, 10(5):315-328.