Design of C40 Concrete Protective Layer Thickness Based on Multi-dimensional Cl-Erosion Life Prediction
In order to study the multi-dimensional Cl-diffusion law of concrete in saline-alkali environment and the design of the corresponding protective layer thickness,ANSYS finite element modeling was used to select four different time nodes to study the Cl-concentration distribution in concrete at different times,and to predict the durability service life of concrete under different diffusion dimensions.Thus,the mapping relationship between the thickness of the concrete protective layer and the design life is established.The results show that compared with 1-D diffusion,the Cl-concentration and diffusion depth of 2-D and 3-D diffusion on the concrete surface are larger,and the depth of 2-D and 3-D diffusion is 1.47 times and 1.84 times of 1-D diffusion,respectively.The durability service life of concrete in the Cl-erosion environment is short,which is less than 20 years under 1-D Cl-erosion and less than 10 years under 3-D erosion.For C40 concrete under the design service life of 50 years,the thickness of the protective layer in the 1-D,2-D and 3-D Cl-diffusion state is 50 mm,60 mm and 68 mm,respectively.
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