Study On Frost Resistance Of High Performance Concrete

This paper presents the results and analysis of the experimental research on the high fluidity concrete with high fluidity and S95 slag and high efficiency water reducing agent by using the whole index of II. The test results of 0.40,0.35, three water cement ratio,30%,50%, three,70%,60,1:3,1:1,,,,1:2,60MPa, the ratio of 30% days, the strength of the composite was 1:1, the ratio of the mixture was 0.30, and the ratio of the composite was tested. The second was the resistance of the air. Get the following results:(1) The frost resistance of concrete in 28 days of age was significantly lower than that of 60 days of age;(2) While the concrete frost resistance of the same age is higher, the water binder ratio is lower, and the freezing resistance of the same water cement is better than that of the water cement ratio;(3) The admixture of concrete, the frost resistance of the concrete is much higher than that of the non-doped concrete. And the experimental data show that:when the water cement ratio is greater than 0.30, even the use of high performance concrete, but also need to add the air lead agent, in order to ensure the high frost resistance of concrete;(4) 30%fly ash content,0.30 water cement ratio,28 days after the freezing and thawing cycles, the relative dynamic modulus decreased to 67.8%, the mass loss was 6.40%, the frost durability index was 50, but the relative dynamic modulus was 300, the mass loss was 60, and the resistance index was 99. This shows that with the increase of the age of concrete, the effect of hydration of the fly ash is obvious, which greatly improves the durability of concrete, and achieves the purpose of this study.