Corrosion-Resistant Concrete Admixture Study

Nowadays, concrete is one of the most wildly used building materials in civil engineering. In a poor environment, concrete have to be suffered the damage from corrosive medium for a long time, which directly leads to the crack of concrete's structure, reduce of its durability ,and finally damage occurred earlier than predicted. How to improve the durability if concrete has been a hot topic in civil engineeringThe text compaire and analyse the fly ash and micro-silica concrete by the experiment of cement mortar sulfate resistance,experiment of concrete chloride diffusivity and experiment of drying/wetting cycle in corrosive environments.The experiments have rich content and long cycles: experiment of cement mortar sulfate resistance lasted 3 months, experiment of drying/wetting cycle in corrosive environments made 110 times, experiment of chloride diffusivity lasted 90d.For improve the anti-corrosive ability in sea water and salty soil, the authority put forward the method of adding anti-corrosive admixture in concrete. Combining all kinds of mixed-material's display in durability experiments and refers to the domestic and international study data, we determined the main composition and o coordination ratio of concrete anticorrosive etching reagent.We tested the ability of anti-corrosive admixture by the 3 experiments above, and analyses the anti-corrosive mechanism of the anticorrosive etching reagent.The text analyses microscopic structure of concrete added fly-ash and micro-silica by SEM.Compared microscopic structure change of sample under water maintains and drying/wetting cycle in corrosive environments, and deeply discussed the anti-corrosive mechanism of fly-ash and micro-silica, also explained previous study of sulfate resistance and chloride diffusivity.