Preparation and Anti Permeability and Anti Salt Freezing-thawing on the Concrete of Self-repairing Concrete

The self-repairing concrete was prepared using choline chloride as accelerant, ultrafine silicon dioxide as activating agent, zeolite powder as reaction assistant, 52.5^# ordinary portland cement as binder and quartz sand as structural enhancer to form a mixture, after stirring evenly, adding water in accordance with the proportion of 0.4 water:1 mixture to corrfect a concrete repair agent, and then ia was coated on the concrete surface to get self-repairing concrete. The anti permeability and anti salt freeze-thawing performance of the self-reparing concret were investigated. The results show that the anti permeability and anti salt performance of the self-repairing concrete were significantly improved, the anti seepage pressure and secondary impermeability pressure were both significantly higher than the benchmark concrete's. In NaCl solution, after 200 times of freezing and thawing cycle, the self repairing concrete quality loss rate reduced 45% than the benchmark concrete's, the relative dynamic elastic modulus declined more slowly than the benchmark concrete's.