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首页> 外文会议>Eurocorr 2004 >Influence of Cathodic Protection (CP) on the Distribution of Ions in theConcrete Overlay Containing Chlorides
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Influence of Cathodic Protection (CP) on the Distribution of Ions in theConcrete Overlay Containing Chlorides

机译：阴极保护（CP）对含氯混凝土覆盖层中离子分布的影响

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摘要

CP is a widely accepted technique applied successfully since more than thirty years for theprotection of the steel reinforcement against corrosion. There are numerous studies thatprove the efficiency of the corrosion protection of the steel reinforcement by CP. Theinfluence of the electric field and the current flow respectively during CP operation on thedistribution of ions in the concrete overlay is so far not sufficiently known. Changes in thedistribution of ions during CP operation in the concrete overlay are of interest with respectto the potential efficiency of electrochemical chloride extraction and with respect to thequality of concrete that may be altered by changing the composition of the pore solution.In a field study on a pilot scale, CP was applied on steel reinforced concrete slabs (1,0 ×1,5 × 0,1 m) containing 1% and 3% chloride per weight of cement. Three different surfacemounted anode systems were evaluated: MMO-titanium mesh anode, conductive coatinganode and a galvanic anode composed of a zinc foil glued to the concrete surface. After1,5 years of CP operation, sections of concrete cores were investigated by wet chemicalanalysis and by EDX analysis in an environmental scanning electron microscope (FEGESEM).Results show that CP has a marked influence on the distribution of chloride ionsbut only a weak influence on the distribution of potassium- und sodium ions. Attractiveand repulsive forces exerted by the anode and cathode lead to a wave like distribution ofchloride ions in the concrete overlay. Convective transport of the pore solution within theconcrete overlay due to wet/dry cycles by weathering may override migration of ions dueto CP. Therefore, the influence of CP on the ionic distribution, especially of chlorides, inthe concrete overlay depends on the efficiency of anode systems in preventing the ingressof humidity into the concrete overlay, being highest below the zinc foil anode and lowestbelow the titanium mesh anode.
机译：CP是三十多年来成功应用的技术，用于保护钢筋免遭腐蚀。有大量研究证明了CP可以增强钢筋的防腐性能。到目前为止，在CP操作过程中电场和电流分别对混凝土表层中离子分布的影响尚不清楚。在混凝土覆盖层中进行CP操作期间，离子分布的变化与电化学氯化物萃取的潜在效率以及可通过改变孔隙溶液组成而改变的混凝土质量有关。在中试规模上，CP应用于钢筋水泥混凝土板（1,0×1,5×0.1 m），水泥板中水泥的重量为1％和3％。评估了三种不同的表面安装阳极系统：MMO-钛网状阳极，导电涂层阳极和由锌箔粘合到混凝土表面组成的电镀阳极。在CP运行1.5年后，通过湿化学分析和EDX分析在环境扫描电子显微镜（FEGESEM）中对混凝土芯的截面进行了研究。结果表明，CP对氯离子的分布有显着影响，而对氯离子的分布影响很小。钾和钠离子的分布。阳极和阴极施加的吸引力和排斥力导致混凝土表层中的氯离子呈波状分布。由于风化引起的湿/干循环，混凝土覆盖层内的孔隙溶液的对流传输可能会覆盖由于CP引起的离子迁移。因此，CP对混凝土表层中离子分布（尤其是氯化物）的影响取决于阳极系统防止湿气进入混凝土表层的效率，在锌箔阳极下方最高，而在钛网阳极下方最低。

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  • 来源
    《Eurocorr 2004》|2004年|1-10|共10页
  • 会议地点 Nice(FR)
  • 作者

    W. Schwarz; J. Tritthart; R. Sonnleitner; G.E. Nauer;

  • 作者单位

    CAS Composite Anode Systems GmbH Josefst?dterstrasse 65/6 A-1080 Wien schwarz.wolfgang@chello.at;

    Technical University Graz Stremayrgasse 11 A-8010 Graz tritthart@tugraz.at;

    ECHEM Centre of Competence in Applied Electrochemistry Victor Kaplan Strasse 2 A-2700 Wiener Neustadt gerhard.nauer@echem.at;

    ECHEM Centre of Competence in Applied Electrochemistry Victor Kaplan Strasse 2 A-2700 Wiener Neustadt;

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  • 关键词

    Steel Reinforcement; Cathodic Protection; Ion Migration; Chloride Migration;

    机译：钢筋；阴极保护;离子迁移；氯化物迁移;

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