Study On Anti-chloride Ion Penetration Of RPC

Reactive powder concrete (RPC) is a new composite material which possess good mechanical properties and durability. Using RPC materials for structural design instead of traditional concrete can make the structure lighter and improve the structural span which can greatly improve the durability of structures, reduce the maintenance and repair costs during its service time.The strength of RPC with different mineral admixtures and aggregate were tested in this paper. The test results indicate that:In constant water cement ratio, the volume content of steel fiber has the biggest influence on compressive strength and flexural strength, especially for flexural strength value.The enhancement effects is different with different mineral admixtures;under appropriate quantity ratio of Silicon ash, adding two or more complex of the mineral admixture is better than adding single mineral.Based on the above, the paper focus on the chloride ion permeability test of the RPC to study the resistance performance to chloride corrosion with different mixture ratio system; further analysis of chlorine ion impermeability mechanism were carried based on electric field and concentration field under the action of fick's second law.Then a test method of RPC material diffusion coefficient D and durability design model were established. Specially, five kind of mixture ratio were tested on the combination of chloride ion ability to make a correction of the fick's second law. Fixed chloride ion diffusion coefficient considering the binding ability of RPC material on chloride ions, and made further amendments to the RPC life prediction based on chloride corrosion.