Abstract
In order to increase freeze-salt scaling resistance of concrete, improvement of fly ash, slag and air entraining agent on freeze-salt scaling resistance are researched according to the CDF method. The results show that the scaled mass and the dynamic modulus of elasticity loss rate of concrete are reduced by 20% to 36 % and 4 % to 55 %. The microstructure was more denser compared with the control concrete after 28 cycles as a result of adding mineral admixture and air entraining agent into concrete. The freeze-salt scaling resistance of concrete is improved. The freeze-salt resistance of concrete mixed with ground slag is superior to fly ash concrete. The damage of concrete is mainly surface scaling during salts frost.
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