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EXPERIMENTAL STUDY ON THE ANTI-CHLORIDE ION PERFORMANCE OF CONCRETE IN SALT SPRAY ENVIRONMENT
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摘要: 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。Abstract: The coastal concrete structures in the salt spray environment are suffered from chloride ion,which produces greatest risk to the structural durability and safety and leads to the destruction of the structure just within the design reference period. Based on the construction of high-grade highway structures in coast of Jiangsu province,the effect of the content of mineral admixtures on the durability of concrete under the salt spray environment was studied.Coastal environment was simulated by salt spray wet and dry circle. And five concrete specimens with different contents of fly ash and slag were analyzed in the corrosion test. The results show that the mineral admixtures in concrete can effectively fill the concrete pores,reduce porosity and improve the ability of concrete to resist the chloride ions ingress. When the fly ash and slag account for 25% of total cementing materials respectively,the diffusion coefficient of chloride ion of the sample is the smallest,which better performance of resistance to chloride ion erosion.
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Key words:
- salt spray environment /
- concrete /
- mineral admixtures /
- diffusion of chloride ion /
- durability
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