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盐渍土中含有浓度较高的腐蚀性盐离子,对埋置其中的混凝土构件有着很强的破坏性,威胁混凝土工程的安全与质量。论文以高性能混凝土作为基准混凝土,初选单掺1%纳米CaCO_3、复掺1%纳米CaCO_3+1%纳米SiO_2、复掺1%纳米CaCO_3+3%纳米SiO_2、复掺1%纳米CaCO_3+1%纳米TiO_2、复掺1%纳米CaCO_3+3%纳米TiO_2制备6种类型的混凝土试件。在硫酸钠溶液中进行干湿循环试验,并对腐蚀后的试件进行微观结构扫描,观察不同类型之间的差异,结果表明:在半浸泡情况下,复掺1%纳米CaCO_3+3%纳米SiO_2的混凝土具有最佳的耐硫酸盐腐蚀性能。
Salty soil contains high concentration of corrosive salt ions, which is embedded in the concrete components have a strong destructive threat to the safety and quality of concrete works. In this paper, high-performance concrete is used as the reference concrete. Primary mixed with 1% nano-CaCO 3, 1% nano-CaCO 3 + 1% nano-SiO 2 and 1% nano-CaCO 3 + Six types of concrete specimens were prepared from nano-TiO 2 and nano-CaCO 3 + 3% nano-TiO 2. In the sodium sulphate solution, the wet-dry cycle test was carried out, and the microstructure scanning of the corroded specimen was carried out to observe the difference between the different types. The results showed that under the conditions of semi-immersion, the nano-CaCO 3 + 3% The concrete of SiO_2 has the best sulphate corrosion resistance.