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由于地铁在运行过程中产生的杂散电流会造成钢筋混凝土中钢筋的电化学腐蚀,从而影响地铁混凝土结构的耐久性。在配制混凝土时,用矿渣和粉煤灰取代一部分水泥,可明显改善胶凝材料硬化浆体的孔结构,降低孔溶液中的离子浓度,从而提高混凝土的电阻率。提高混凝土的电阻率可在一定程度上减缓钢筋的腐蚀。使用三组分胶凝体系研究方法,对水泥、粉煤灰和矿渣组成的三组分胶凝体系的交流阻抗特性和电阻值进行了研究和分析,得到不同龄期的阻抗等值线图。研究表明,当三组分胶凝体系中粉煤灰和矿渣总量在50%～65%的范围,且两者得比例为1左右时,三组分胶凝材料砂浆的电阻率最大。
Due to the stray current generated during the operation of the subway will cause electrochemical corrosion of steel bars in the reinforced concrete, thus affecting the durability of the concrete structure of the subway. In the preparation of concrete, the use of slag and fly ash instead of part of the cement can significantly improve the pore structure of the cementitious material hardening slurry, reducing the ion concentration in the pore solution, thereby increasing the concrete resistivity. Increasing the resistivity of concrete can slow down the corrosion of steel bars to a certain extent. The three-component gel system was used to study the AC impedance and resistance of three-component cementitious system composed of cement, fly ash and slag. The impedance isograms of different ages were obtained. The results show that the resistivity of the three-component cementitious mortar is the highest when the total amount of fly ash and slag in the three-component gelling system is in the range of 50% -65% and the ratio of the two is about 1.