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

为了在设计阶段利用有限元等数值分析方法对阴极保护效果进行评价，需要准确地评价钢筋的极化特性和混凝土的电阻率。由于数值分析的精度必须依赖于输入值。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程序的测量方法。此外，阴极保护的效果进行了估计的基础上，从测量方法获得的输入值的三维有限元法。通过对某混凝土结构足尺试件的试验数据和三维有限元法的计算结果进行比较，验证了该方法的有效性。

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.