Experimental study of the freeze-thaw performance of ultra-high strength concrete with different mineral admixtures.

In order to study the freeze-thaw performance of ultra-high strength concrete with different mineral admixtures at water cement ratios of 0.21, 0.24 and 0.27, the mass loss rate and the relative dynamic elastic modulus were evaluated, which were combined with the pozzolanic effect. The results showed that the frost resistance of ultra-high strength concrete was closely related to the ratio of mineral admixtures and water binder ratio and there was an optimal dosage. Meanwhile, under the same water to binder ratio, the mass loss rate of the ultra-high strength concrete prepared by ternary complex-admixture with 20% fines, 20% fly ash and 10% silica fume was the smallest, and the relative dynamic elastic modulus was the highest. Therefore, there was an optimal dosage. When the mineral admixture was the same for 0.21 water binder ratio, the mass loss rate was the smallest and the relative dynamic elastic modulus was the highest. Under this condition, it has the highest frost resistance. [ABSTRACT FROM AUTHOR]