The effect of environmental classification and prescriptive requirements of concrete code on the expansion of crack width caused by rebar corrosion

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Hosseini Seyed Abbas

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Journal Paper

Paper Information

Journal: Journal of Structural and Construction Engineering Year:2023 | Volume:10 | Issue:10 Page(s): 222-239

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Information Journal Paper

Title

The effect of environmental classification and prescriptive requirements of concrete code on the expansion of crack width caused by rebar corrosion

Author(s)

Hosseini Seyed Abbas | Issue Writer Certificate

Keywords

Reinforcement corrosion

Chloride ion

Crack width

reinforcement concrete

Concrete Durability

Abstract

The design codes prescribe the durability criteria by providing criteria such as the minimum thickness of the concrete clear cover, and the minimum permissible compressive strength. In the initial phase, these rules delay the effect of destructive factors, but with the initiation of rebar corrosion, these prescribed rules can have different effects on the propagation of destructive factors. One of the consequences of the rebar's corrosion is the creation of cracks in the concrete cover. Whit increasing the width of the cracks during the propagation of corrosion, the effects of external aggressive factors increase. In this research, using the most important existing experimental models for predicting Crack width, the effect of prescriptive criteria on Crack width has been investigated. For this purpose, the prescriptive rules of the concrete design code were considered as the initial condition of the structure according to the environmental condition of the reinforced concrete structure. The investigated models were selected based on chloride-induced corrosion. The important influencing parameters in the models were considered as random variables and the Crack width was obtained as a random variable based on the existing models. The impact of rebar diameter selection in the environmental conditions defined in the design code on the Crack width has been calculated. The calculation of the Crack width was done using the Monte Carlo sampling method and the average of the experimental models and the coefficient of variation were calculated by considering the correlation between the models. The results have shown that the use of rebars with a smaller diameter reduces the Crack width by 90%. Also, if the rebar corrosion begins and a certain period of time has passed since its beginning, the safety level of a certain structure is not the same due to the large difference in the width of the cracks.

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