干湿循环作用下不同掺和料对水工混凝土抗氯离子侵蚀研究

实际工程表明,混凝土结构干湿循环部位往往破坏更为严重。文章以干湿交替区域的混凝土为研究对象,研究了干湿循环作用下基准混凝土、轻烧氧化镁混凝土、聚丙烯纤维混凝土、轻烧氧化镁—聚丙烯纤维混凝土抗氯离子侵蚀性能的差异性。结果表明,在干湿循环作用下,四种混凝土中轻烧氧化镁混凝土的抗氯离子侵蚀能力最强,其后依次为双掺混凝土、基准混凝土和聚丙烯纤维混凝土。

Study on Resistance of Different Admixtures to Chloride Ion Erosion in Hydraulic Concrete under Wetting and Drying Cycles

Practical engineering shows that the wetting and drying cycle parts of concrete structures are often damaged more seriously.The concrete in the wet and dry alternating region is taken as the research object,and the difference of chloride ion corrosion resistance of reference concrete,lightly calcined magnesia concrete,polypropylene fiber concrete and lightly calcined magnesia-polypropylene fiber concrete under the wetting and drying cycle action is studied.The results show that the lightly calcined magnesia concrete has the strongest resistance to chloride ion erosion followed by the double-mixed concrete,the reference concrete and the polypropylene fiber concrete under the wetting and drying cycle action.