Developing a Model for Chloride Ions Transport in Cement Concrete under Dynamic Flexural Loading and Dry‐Wet Cycles

Abstract

Chloride ions attack is the main factor leading to the degradation of concrete durability, while the diffusion process would be significantly aggravated under the dynamic flexural loading and dry-wet cycles. In this paper, the influence coefficients of dynamic flexural loading on chloride/water diffusion coefficients were established, based on the relationship between the dynamic flexural loading and the chloride ions diffusion coefficient of concrete. Based on the model of chloride ions transporting in dry-wet cycle environment, the transport model of chloride ions in concrete under the dynamic flexural loading and dry-wet cycles was established. The effects of different factors on the chloride ions transport law in concrete were analyzed through laboratory test. The results showed that the model was in good agreement with the experimental results. The theory and assumptions proposed applied in the model of chloride ions transport in concrete under the dynamic flexural loading and dry-wet cycles had certain rationality and scientificity.

Study on Cl− Erosion of Concrete under the Combined Effect of Fatigue Load and Wet–Dry Cycles: A Review

“…Ma et al [90] proposed a new model for predicting the fatigue damage o The combination of multiple factors affects the durability of concrete, resulting in modeling that is often not comprehensive. Guan et al [88] established a Cl − erosion model for concrete under fatigue load and dry-wet cycles based on the migration model of Cl − in dry-wet cycle environments, and they analyzed the influence law of different factors on Cl − migration in concrete through indoor tests. Wu [83] established a Cl − migration model considering diffusion, convection, and capillary modes; calculated the Cl − diffusion coefficient under fatigue load and dry-wet cycles; and obtained the relationship between Cl − diffusion coefficient and stress level.…”