Abstract
The durability of structure cannot be guaranteed when a corrosion expansion crack reaches the surface of the reinforced concrete member. In this paper, firstly, based on the existing theoretical model of steel corrosion degree, the calculation process of the model and the determination of the relevant parameters in the model were analyzed and discussed. Secondly, the stiffness reduction factor of concrete in the model was calculated according to the existing experimental data, and the engineering formula of the steel corrosion degree was established, which was related to the surface crack width of reinforced concrete. Moreover, the experiments of steel bar corrosion were carried out with different components of surface crack width, in which the parameters of the bar diameter, concrete protection layer thickness, and water-cement ratio were taken into consideration. The experimental phenomena and results were further analyzed and discussed. Finally, comparing with the experimental data, the engineering formula presented in the paper was validated. The results show that the calculated values by the engineering formula are in better agreement with the experimental values than those by the existing model, which provide a theoretical basis for further study on the durability limit state of the structure.
Highlights
Steel bar in a reinforced concrete structure located in coastal areas are bounded to different degrees of corrosion due to chloride ions, resulting in cracking and peeling of the concrete cover, which is badly endangering the reliability of the structure
It is of practical significance to carry out fast and nondestructive determination of corrosion degree of steel bars for reinforced concrete structures in service for reasonable and accurate assessment on structural durability, determination of the maintenance and reinforcement measures, and redesign of the structure based on the reasonable and accurate assessment for structure durability
It can be used to describe the mechanism of corrosion expansion process in concrete caused by tensile force leading to cracking of concrete cover, its calculation process is more complex and difficult to apply, which presents obvious deviation from test results
Summary
Steel bar in a reinforced concrete structure located in coastal areas are bounded to different degrees of corrosion due to chloride ions, resulting in cracking and peeling of the concrete cover, which is badly endangering the reliability of the structure. In the tests, the researchers found that the corrosion degree has a significant effect on the component surface crack width, and it is in relevance with the parameters including the concrete strength grade, component size, thickness of concrete protection layer, and diameter of the steel [5,6,7,8]. In the aspect of numerical simulation, the finite element models established by Du et al [9] and Chen and Leung [10] simulated the corrosion process of the component surface, and the evolution law of the corrosion expansion stress was calculated by the numerical analysis method. In the process of finite element modeling, certain assumptions on the properties and constitutive relation of materials were required to put forward, on which the test data were insufficient for comparison, so the results of numerical
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