Development of the design system of cathodic protection by combination between 3D numerical analysis and electrochemical properties obtained from existing concrete structures

采用有限元等数值分析方法对设计阶段的阴极保护效果进行评估时，需要对钢筋的极化特性和混凝土的电阻率进行准确的评估。因为数值分析的准确性必须取决于输入值。本研究发展了这些电化学性质的非破坏性或小规模破坏性测量方法。此外，根据测量方法得到的输入值，用三维有限元方法对阴极保护的效果进行了评估。将三维有限元估算结果与模拟既有混凝土结构的足尺试件的试验数据进行对比，验证了该测量方法的有效性。

It is necessary to evaluate the polarization characteristic of steel bars and the electric resistivity of concrete exactly, in case of estimating an effect of cathodic protection in a design phase by using numerical analysis, such as FEM. Since the accuracy of numerical analysis must depend on the input values. This study developed the measuring methods for these electrochemical properties by non-destructive or small scale destructive procedures. In addition to this, the effects of cathodic protection were estimated by 3D-FEM based on the input values obtained from the measuring methods. As a result of comparing the estimation by 3D-FEM with experimental data of the full-scale specimens which imitated an existing concrete structure, the validity of the measuring method was verified.