Effect of different states of chloride ion penetration in concrete on the life model due to flexural failure

Document Type : Research Paper

Authors

1 Assistant Professor in Structural Engineering, Faculty of Technology and Mining, Yasouj University, Choram, Iran .

2 Department of Civil Engineering, Birjand University of Technology, P.B. 9719866981, Birjand, Iran

3 Faculty of Technology and Mining/ Yasouj University/ Choram/Iran.

10.22124/jcr.2021.18773.1494

Abstract

Evaluation of the life model of concrete structures has an effective role in determining maintenance programs as well as estimating the probability of failure of these structures. One of the most important factors that affect the durability and strength of concrete structures is the corrosion of rebars, which is generally caused by the penetration of chloride ions in concrete. Due to the corrosion of the rebar, the effective surface of the rebars is reduced and over time, by creating cracks in the concrete section, the effective concrete cross-section is also reduced. In this study, considering the inherent and statistical uncertainties of the parameters affecting corrosion, for different states of chloride ion penetration, the concrete beam life model has been evaluated. For this purpose, considering a concrete beam, different scenarios of chloride ion penetration from different directions of the beam cross-section is considered, and based on each scenario, the corrosion initiation time of rebars, cracks, and scaling of concrete are calculated and the effect of each event on The flexural strength of the beam is evaluated. The results show that considering the effect of concrete scaling causes a difference of up to 20% in the predicted values for the flexural strength of concrete beams and a more realistic assessment of the remaining life of the structure will be obtained. Also, the states that cause the compressive cross-section of the concrete to peel are more critical in the concrete beam life model due to the reduction of the effective depth.

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