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首页> 外文期刊>Cement & concrete composites >Protection current distribution in reinforced concrete cathodic protection Systems
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Protection current distribution in reinforced concrete cathodic protection Systems

机译：钢筋混凝土阴极保护系统中的保护电流分布

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摘要

Current distribution from a surface mounted anode to steel reinforcement in atmospherically exposed concrete is modelled as a function of the condition of the steel, the resistivity of the concrete and anode-steel geometry. The boundary conditions at the steel have a significant effect on current distribution with more uniform distribution arising at low steel corrosion rates. In a typical situation the surface of a steel bar facing the anode may receive 50 percent more current than the opposite surface. As cathodic protection has proved to be effective in these cases, a basis for many design decisions that influence current distribution is small that their effect is small by comparison. When more than one layer of reinforcement is present the current distribution is significantly worse. In this case a surface anode may not be enough and discrete anodes may be necessary to improve current distribution. An increase in the concrete resistivity, cover and the anode to cathode area ratio at a constant anode current density will increase the voltage drop through the concrete inducing an improvement in the environment at the steel that promotes steel passivity.
机译：在大气暴露的混凝土中，从表面安装阳极到钢筋的电流分布是根据钢的状态，混凝土的电阻率和阳极-钢的几何形状而建模的。钢的边界条件对电流分布有很大影响，在低钢腐蚀速率下会产生更均匀的分布。在典型情况下，面对阳极的钢筋表面可能会比相反的表面多接收50％的电流。由于阴极保护已被证明在这些情况下是有效的，因此许多影响电流分布的设计决策的依据很小，而相比之下其影响很小。当存在一层以上的增强层时，电流分布会明显变差。在这种情况下，表面阳极可能不足，因此可能需要离散的阳极来改善电流分布。在恒定的阳极电流密度下，混凝土电阻率，覆盖率和阳极与阴极面积之比的增加将增加通过混凝土的电压降，从而导致改善钢处环境的状况，从而促进钢的钝化。

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