The Numerical Study Of Combine Ingress Of Carbonation And Chloride

Under the guidance of the "One Belt and One Road" policy,the position of oceans in China has been gradually valued for.In this context,the construction of coastal cities and ports,Marine tourism islands,Marine economic zones and other Marine projects have been widely applied.People also put forward higher requirements on the quality of such projects,and these projects also show the orderly development of the domestic civil engineering industry,but the durability problems of many projects are also exposed over time.Seawater is rich of ionic species,including chloride ions,and there is a great deal of carbon dioxide in the air,especially in the case of industrial pollution.In Marine and industrial environments,reinforced concrete structures are vulnerable to be eroded by chloride ion and carbon dioxide.Both of them will lead to the deterioration of steel and concrete.Chloride transport and carbonation could destroy the protective layer of concrete from the concrete surface and cause the corrosion of internal steel reinforcement.Therefore,the coupling of chloride transport and carbonation will aggravate the serious corrosion of reinforced concrete structures.In this work,the binding effect of chlorine ions,the subsequent diffusion process and the distribution of chloride and carbonation are evaluated.The mutual influence mechanism between carbonization and chloride ion transmission is discussed.It is set under the assumption that the concrete is first completely polluted by chlorine ions and then eroded by carbonization.Therefore,this paper innovatively adopted the concept of carbonation rate considering environmental impact factors,and established a numerical model to illustrate the effects of carbonation and chloride transport.In addition,this paper also considers the effect of unsaturation factors on carbonization and chloride erosion in concrete.The result shows that the model of carbonization rate used in this paper can effectively and quantitatively describe the effect of chloride ion and carbonization on concrete.