Study on Chloride Ion Penetration for Concrete Structures in Zhunhai Area

Abstract

The chloride concentration distribution is an efficient method of evaluating corrosion characteristics of concrete structures.A number of concrete samples at various positions were drilled in Zhuhai area and the free chloride concentration of concrete were determinated.Besides,the influences of elevations,distances from the sea and the local environment on chloride were analyzed.The value of chloride diffusion coefficient and surface chloride ion concentration along various elevation at the sea were calculated according to Fick's second law.The results show that chloride's erosion aciton tends to reduction with elevation and it is the most serious at an elevation of 1 meter for concrete by the sea.There is the large convective depth in alternate wetting-dry ares.Whereas it is just about 0.02%-0.05% on the road,at the distance of 15 kilometers from the seafront,which indicates that the father away from the seafront,the weaker chloride's erosion action becomes.