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The test of fast-freezing method is employed to research the freezing resistance of C60 and C80 high-performance concrete with nanometer-SiO_2,and XRD and SEM are employed to analyze the mechanism of its influence.The experimental results show that the freezing resistance of high-performance concrete has been effectively improved.The compressive strength of C60,C70 and C80 high-performance concrete added with nano-SiO_2 can be improved by 8%,6% and 5% respectively,the weight loss can be reduced by 1%,0.6% and 0.3% respectively and the relative dynamic elastic modulus can be improved by 7%,4% and 6% respectively after the 300 times freeze-thaw cycle.
The test of fast-freezing method is employed to research the freezing resistance of C60 and C80 high-performance concrete with nanometer-SiO 2, and XRD and SEM are employed to analyze the mechanism of its influence. The experimental results show that the freezing resistance of High-performance concrete has been effectively improved. The compressive strength of C60, C70 and C80 high-performance concrete added with nano-SiO 2 can be improved by 8%, 6% and 5% respectively, the weight loss can be reduced by 1% , 0.6% and 0.3% respectively and the relative dynamic elastic modulus can be improved by 7%, 4% and 6% respectively after the 300 times freeze-thaw cycle.