The Service Life of Circular Section Member under Chlorine Ion Erosion

Abstract

The concrete structure, when being eroded, suffers premature destruction due to poor durability. This is primarily attributed to overlooking the impact that the shape and diffusion of dimension exert on the chlorine ion diffusion while designing the durability of the concrete structure. The method that is used for calculation of the durability of circular section members under chlorine ion erosion was proposed herein with the service life ending when chloride concentration on the surface of rebar reaches the critical concentration of chloride concentration. Furthermore, efforts were made through giving examples in analysis of the distribution rule of chlorine ion contained in the circular section members when attacked by traditional single-dimension and two-dimension chlorine ions as well as the service life of concrete members with different sections. The examples demonstrate that if circular section members were adopted to design the durability of the concrete structure in resisting chlorine ion erosion, the durability the concrete mix-ratio scheme requires would be extended and achieved, beneficial to making it less difficult to prepare concrete and cutting construction cost. Therefore, it concludes the circular section member is more durable than rectangular section member.