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临海混凝土结构物在盐雾环境下遭受氯离子侵蚀,给结构耐久性和安全性带来极大危险,导致结构物在设计基准期破坏。结合江苏临海高等级公路结构物的建设,研究了矿物掺合料掺量对盐雾环境下混凝土耐久性的影响。通过干湿循环模拟了临海盐雾环境,分别采用5种不同粉煤灰和矿粉掺量配比的混凝土试件,进行盐雾环境下的腐蚀试验。试验结果表明:混凝土中矿物掺合料的加入可以有效地填充混凝土孔隙,降低孔隙率,提高混凝土抗氯离子渗透性能。当掺入粉煤灰和矿粉各占胶凝材料总量25%的配合比时,氯离子扩散系数最小,表现出良好的抗氯离子侵蚀性能。
Concrete structures in the sea are subject to chloride ion erosion under salt fog environment, posing great danger to the durability and safety of the structure, resulting in the destruction of the structure in the design base period. Combined with the construction of Jiangsu Linhai high-grade highway structures, the influence of the content of mineral admixtures on the durability of concrete in salt spray environment was studied. The sea salt spray environment was simulated by the wet-dry cycle. Five kinds of concrete specimens with different proportions of fly ash and mineral powder were respectively used for corrosion test in salt spray environment. The test results show that the addition of mineral admixtures in concrete can effectively fill the pores of concrete, reduce the porosity and improve the resistance of concrete to chloride ion penetration. When mixed with fly ash and slag accounted for 25% of the total amount of cementitious material mixture, the chloride ion diffusion coefficient of the smallest, showing good resistance to chloride ion erosion.