Finite-Element Analysis of Chemical Transport and Reinforcement Corrosion-Induced Cracking in Variably Saturated Heterogeneous Concrete

Although reinforced concrete (RC) has an important advantage that it has virtue durability against an environmental attack, especially the resistance of corrosion of embedded reinforcements, due to the high alkalinity nature of concrete property, unfortunately, the problems of reinforcement corrosion still exist in many reinforced concrete structures. It has brought out many questions on the safety and serviceability of these corroded RC structures. Thus, it needs more effective approach for structural performance evaluation of the corroded structures. The residual capacity of the corroded reinforcement was determined through the evaluation of the volume increase of reinforcing steel and concrete crack propagation. The final determination of the service life of concrete structures was made based on the above evaluation results. Also, the effects of reinforcement corrosion on structural behaviours of RC members are investigated so that the reliable evaluation of structural performances of corroded RC members can be achieved by finite element method (FEM). The corrosion attack penetration has been given as a function of the time as input in the analyses. The load of corrosion applied inside the structural members can be modelled by the displacement around the circumferential surface between the reinforcing bars and concrete. The reduction of capability of the structures is determined from the corrosion level in the service years. Another complex phenomenon that governs concrete behaviour is the transfer of shear force across the interface by bond mechanism between concrete and steel reinforcement. It is a fundamental to most aspects of concrete behaviour. The bond mechanism is influenced by multiple parameters, such as the strength of the surrounding structures, the occurrence of splitting cracks in the concrete and the yielding of the reinforcement. However, when RC structures are analysed using the FEM, it is quite common to assume that the bond stress depends solely on the slip between the bars and concrete. In this the research the relationship of bond slip is also studied using FEM. An analytical study based on fracture mechanics was earned out to investigate the behaviour of three different types of specimens. In recent RC research, finite element modelling techniques have been developed to quickly evaluate the physical phenomena associated with cracking and bond. The non-linear finite element program ATENA with the non-linear material models for concrete, reinforcement bar and bond-slip is used to analyse cracking propagation and bond failure process. The influence between corrosion and bond slip in RC structure is also studied. Therefore, the understanding of serviceability of RC structure is improved. It was concluded that with the increase of load and the propagation of the crack, stress redistributed in the steel- continues until the specimen is damaged. The non-linear finite element fracture analysis shows that non-linear fracture mechanics can be effectively applied to investigate concrete fracture. Also, comparisons between the analyses of crack propagation and stress redistribution obtained using the finite element analysis was in good agreement with tests found in the literature.

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Finite Element Analysis of Expansive Behaviour due to Reinforcement Corrosion in RC Structure

Procedia Engineering ◽

10.1016/j.proeng.2011.05.020 ◽

2011 ◽

Vol 12 ◽

pp. 117-126 ◽

Cited By ~ 1

Author(s):

Xiao Pengwei ◽

Yi Ning ◽

Su Linwang ◽

Li Guobao ◽

Wang Lebin

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Reinforcement Corrosion ◽

Element Analysis ◽

Rc Structure

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Influence of specimen dimensions and reinforcement corrosion on bond performance of steel bars in concrete

Advances in Structural Engineering ◽

10.1177/1369433219900682 ◽

2020 ◽

Vol 23 (9) ◽

pp. 1759-1771

Author(s):

Bai Zhang ◽

Hong Zhu ◽

Jun Chen ◽

Ou Yang

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Experimental Results ◽

Reinforcement Corrosion ◽

Element Analysis ◽

Bond Slip ◽

Bond Performance ◽

Concrete Deterioration ◽

Pull Out ◽

Steel Bars

To study the deterioration of bond performance between concrete and corroded steel bars with designed corrosion levels of 0%, 0.5%, 1.0%, 2.0%, 5.0%, 8.0%, and 10.0%, pull-out tests were performed on cube specimens with the dimensions of 10 D × 10 D × 10 D, where D is the diameter of longitudinal rebars ( D = 14, 20, and 25 mm, respectively). The experimental results indicated that with the specimen dimensions increased, the expansive cracks induced by corrosion products appeared earlier and the maximum expansive cracking width was larger at the same corrosion levels. The bond strength and the initial bond stiffness first increased and then dramatically decreased as the concrete deterioration and reinforcement corrosion levels increased for each specimen dimension, whereas the specimens with the larger diameter ( D = 25 mm) were more sensitive to the corrosion than those with the smaller diameter ( D = 14, 20 mm). The free-end slip and the energy dissipation for each specimen dimensions, which decreased slowly with increasing corrosion levels before the corrosion-induced cracks and then weakened rapidly when the corrosion-induced cracks appeared, was almost independent of the influence on corrosion levels after the corrosion-induced cracks appeared. Based on the experimental results, a simplified expression for the calculation of residual bond stress and an empirical model of the bond–slip constitutive equation that considers the influence of reinforcement corrosion were proposed, which can be used in finite element analysis of corroded reinforced concrete.

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Finite Element Analysis of Corrosion and Bond-Slip

10.32920/ryerson.14649627.v1 ◽

2021 ◽

Author(s):

Yan Lan

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Reinforcement Corrosion ◽

Element Analysis ◽

Rc Structures ◽

Bond Slip ◽

Linear Finite Element ◽

Rc Structure ◽

Non Linear ◽

Bond Mechanism

Although reinforced concrete (RC) has an important advantage that it has virtue durability against an environmental attack, especially the resistance of corrosion of embedded reinforcements, due to the high alkalinity nature of concrete property, unfortunately, the problems of reinforcement corrosion still exist in many reinforced concrete structures. It has brought out many questions on the safety and serviceability of these corroded RC structures. Thus, it needs more effective approach for structural performance evaluation of the corroded structures. The residual capacity of the corroded reinforcement was determined through the evaluation of the volume increase of reinforcing steel and concrete crack propagation. The final determination of the service life of concrete structures was made based on the above evaluation results. Also, the effects of reinforcement corrosion on structural behaviours of RC members are investigated so that the reliable evaluation of structural performances of corroded RC members can be achieved by finite element method (FEM). The corrosion attack penetration has been given as a function of the time as input in the analyses. The load of corrosion applied inside the structural members can be modelled by the displacement around the circumferential surface between the reinforcing bars and concrete. The reduction of capability of the structures is determined from the corrosion level in the service years. Another complex phenomenon that governs concrete behaviour is the transfer of shear force across the interface by bond mechanism between concrete and steel reinforcement. It is a fundamental to most aspects of concrete behaviour. The bond mechanism is influenced by multiple parameters, such as the strength of the surrounding structures, the occurrence of splitting cracks in the concrete and the yielding of the reinforcement. However, when RC structures are analysed using the FEM, it is quite common to assume that the bond stress depends solely on the slip between the bars and concrete. In this the research the relationship of bond slip is also studied using FEM. An analytical study based on fracture mechanics was earned out to investigate the behaviour of three different types of specimens. In recent RC research, finite element modelling techniques have been developed to quickly evaluate the physical phenomena associated with cracking and bond. The non-linear finite element program ATENA with the non-linear material models for concrete, reinforcement bar and bond-slip is used to analyse cracking propagation and bond failure process. The influence between corrosion and bond slip in RC structure is also studied. Therefore, the understanding of serviceability of RC structure is improved. It was concluded that with the increase of load and the propagation of the crack, stress redistributed in the steel- continues until the specimen is damaged. The non-linear finite element fracture analysis shows that non-linear fracture mechanics can be effectively applied to investigate concrete fracture. Also, comparisons between the analyses of crack propagation and stress redistribution obtained using the finite element analysis was in good agreement with tests found in the literature.

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The Study for Non-Destructive Quantification Method of Reinforcement Corrosion Degree Based on Electrochemical Detection and Finite Analysis Technology

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.527.31 ◽

2014 ◽

Vol 527 ◽

pp. 31-36 ◽

Cited By ~ 1

Author(s):

Ding Zeng ◽

Bao Hong Hao ◽

Qi Hui Zeng

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Reinforced Concrete ◽

Electrochemical Detection ◽

Concrete Structure ◽

Reinforcement Corrosion ◽

Reinforced Concrete Structure ◽

Element Analysis ◽

Quantitative Calculation ◽

Non Destructive

Corrosion of reinforcement is one of the most important factors in causing the damage to reinforced concrete structure and the inestimable economic loss and major security risk to a large number buildings with reinforced concrete structure. In order to overcome the disadvantage of previous service reinforcement which can only be carried out by sizing detection not quantification, this paper puts forward to a new method to evaluate non-destructive quantification of corrosion degree of reinforcement based on the combination of electrochemical detection and finite element analysis, thus the effective corresponding can be produced among reinforcement corrosion rate, potential signal and reinforced concrete structural distortion. The relation among corrosion current density and potential characteristic parameters as well as corrosion ratio has been established. Through the finite element analysis technique and the combination with the case analysis, the relation model between the strain rate of concrete beams and detection signal has been built; the forecasted empirical formula for change of strain value of tested reinforcement has been given And by means of verifying the reliability of model with data of previous experiments, the quantitative calculation of reinforcement corrosion degree has been realized, which lays the technical foundation for the research and development of non-destructive detection equipment of corrosion of reinforcement.

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