EFFECT OF ADMIXTURE AND AIR-ENTRAINING AGENT ON SALF-FROST SCALING RESISTANCE OF CONCRETE

Depending on the environment coupling of salts and freeze-thaw cycles，the test method of single-side saltfrost was selected and improvement of mineral admixture and air-entraining agent on salt-frost scaling resistance of concrete was researched. The results show that the scaled mass and the dynamic modulus of elasticity loss rate of the concret are reduced as compared with control concrete by adding mineral admixture and air entraining agent into concrete. The salt-frost scaling resistance of concrete is improved. The salt-frost scaling resistance of concrete mixed with ground slag is better than flyash concrete. Compared with the concrete of other proportion the salt-frost resistance of concrete with fly ash，silica fume and air-entraining agent is better. So the mineral admixture coupled technology is promoted in this more complex situation of salt and freeze-thaw cycles. After single-side salt-frost the scaled mass of the concret is more but the dynamic modulus of elasticity loss rate is less，so the damage of concrete mainly depends on the surface scaling.