山东某大型电厂桩基混凝土防腐蚀性试验

Experimental study on corrosion prevention of concrete pile foundation of a large power plant in Shandong

为研究桩基混凝土在腐蚀性地下水环境中的耐久性，依据山东某大型电厂中等～强腐蚀性地下水地质条件，在Cl^-与SO4^2-共存的地下水环境与只存在SO4^2-的水环境中进行桩基混凝土防腐蚀性试验。结果表明：在Cl^-与SO4^2-共存的地下水环境中，混凝土受硫酸盐侵蚀的程度比只存在SO4^2-的水环境中轻微；掺加防腐剂并没有明显提高混凝土抗蚀能力；抗硫酸盐水泥的抗硫酸盐侵蚀性与普通硅酸盐水泥接近，但抗氯离子侵入性难以满足耐久性要求；采用普通硅酸盐水泥、大掺量掺和料、低水胶比的高性能混凝土能满足桩基耐久性要求。

In order to study the durability of concrete piles in a corrosive groundwater environment, concrete corrosion resistant test of pile foundation in the environments with Cl^- and SO4^2- coexistance and with only SO4^2- existance was performed, according to medium-highy corrosive groundwater geological conditions of a large power plant in Shandong. The results show that in the Cl^- and SO4^2-coexistence groundwater environment, sulfate attack concrete situation is slightly lower than in the presence of SO4^2-only environment, the conventional doped preservatives does not significantly increase corrosion resistance, and resistance to sulfur cement and sulphate resistance of ordinary Portland cement remain close, but resistance to chloride ion invasive can not meet durability requirements. Finally, the ordinary Portland cement and admixture with low water-cement ratio, high-performance concrete pile can be used to meet durability requirements.