The Corrosion Characteristics and Tensile Behavior of Reinforcement under Coupled Carbonation and Static Loading

Xu, Yidong

doi:10.3390/ma8125479

Cited by 11 publications

(7 citation statements)

References 46 publications

(59 reference statements)

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“…The results demonstrated that the concrete cover cracking provided greater availability of oxygen to the steel reinforcement, increasing the formation of oxides and allowing the steel reinforcement to achieve more passive potentials. Besides, owing to the coupled action of chloride ingress and static loading, the corrosion pits tend to grow along the preferred orientation, which makes the corrosion pit pattern more angular and the non-uniform distribution of corrosion morphology on the reinforcement increases significantly [3].…”

Section: Discussionmentioning

confidence: 99%

Corrosion Characteristics of Reinforced Concrete Under the Coupled Effects of Chloride Ingress and Static Loading: Laboratory Tests and Finite Element Analysis

Shen²,

Zheng³

et al. 2018

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The aim of this paper is to describe the coupled effects of chloride ingress and static loading on the evolution of corrosion of steel reinforcement in concrete. A new corrosion test was adopted to accelerate the non-uniform corrosion of the steel. Finite element analysis was used to investigate the influence of coupled chemo-mechanical processes on corrosion expansion stress of the concrete cover. As is shown by the results, the half-cell potentials of steel reinforcement in the reinforced concrete specimens decreased with increase in the number of wetting-drying cycles and the applied static loading, which cause the steel reinforcement to be more prone to corrosion attack. Owing to the coupled action of chloride ingress and static loading, non-uniform distribution of corrosion activity on the steel reinforcement increased significantly. The finite element simulations showed the existence of static loading increased the maximum stress on the concrete cover, which increases the susceptibility of concrete cover to corrosion-related expansion cracking.

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Section: Discussionmentioning

confidence: 99%

Corrosion Characteristics of Reinforced Concrete Under the Coupled Effects of Chloride Ingress and Static Loading: Laboratory Tests and Finite Element Analysis

Shen²,

Zheng³

et al. 2018

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“…Zhang [9] experimentally studied the combination effect of freeze-thaw cycles and chloride attack on concrete damage. Since reinforcement corrosion coupled with sustained load has been recognized as the main issue affecting the durability of reinforced concrete (RC) structures [10], many existing studies have been conducted to investigate the properties of structural concrete under the coupled effect. Li [11] tested the performance of RC beams under coupled sustained loading and reinforcement corrosion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pore Size and Fatigue Loading on NaCl Transport Properties in C-S-H Nanopores: A Molecular Dynamics Simulation

Cao

Fang

et al. 2020

Materials

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The transport properties of chloride ions in cement-based materials are one of the major deterioration mechanisms for reinforced concrete (RC) structures. This paper investigates the influence of pore size and fatigue loading on the transport properties of NaCl in C-S-H nanopores using molecular dynamics (MD) simulations. Molecular models of C-S-H, NaCl solution, and C-S-H nanopores with different pore diameters are established on a microscopic scale. The distribution of the chloride ion diffusion rate and the diffusion coefficient of each particle are obtained by statistically calculating the variation of atomic displacement with time. The results indicate that the chloride ion diffusion rate perpendicular to C-S-H nanopores under fatigue loading is 4 times faster than that without fatigue loading. Moreover, the diffusion coefficient of water molecules and chloride ions in C-S-H nanopores increases under fatigue loading compared with those without fatigue loading. The diffusion coefficient of water molecules in C-S-H nanopores with a pore size of 3 nm obtained from the MD simulation is 1.794 × 10−9 m2/s, which is slightly lower than that obtained from the experiment.

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“…The corrosion of reinforcing steel in concrete is one of the major causes of durability problems for reinforced concrete structures [1,2]. It affects a large number of infrastructures, particularly those that are exposed to marine environments.…”

Section: Introduction mentioning

confidence: 99%

“…Many researchers have investigated the influence of coupled chemo-mechanical process on the corrosion characteristics of reinforcement [2,8]. Jaffer and Hansson investigated the composition and distribution of chlorideinduced corrosion products of reinforcement in crackedconcrete with different loading conditions [9].…”

Section: Introduction mentioning

confidence: 99%

Molecular Dynamics Simulation of Reinforcing Steel Corrosion when Subjected to Both Chloride Attack and Mechanical Loading

Xu¹,

Fang²,

Shen³

et al. 2020

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This paper describes the corrosion process of reinforcing steel under both chloride attack and mechanical loading. Molecular dynamics simulation is adopted to investigate the evolution process of passive film and oxidation process of reinforcement. The mean square displacement and self-diffusion coefficient of O2 under different conditions are also obtained based on molecular dynamics simulation. It is shown that the present of chlorides can increase the energy of Fe atoms on the surface of Fe3O4 substrate, leading Fe atoms to separate from Fe3O4 easily and to get more chance to react with oxygen atoms. The interaction of chloride attack and mechanical loading can aggravate the damage of passive film on the surface of reinforcement and result in an increase of oxidation depth of Fe matrix. The coupled effects of chloride and static loading can accelerate the diffusion of O2 to the iron matrix, thus increasing the oxidation reaction between the iron matrix and O2.

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The Corrosion Characteristics and Tensile Behavior of Reinforcement under Coupled Carbonation and Static Loading

Cited by 11 publications

References 46 publications

Corrosion Characteristics of Reinforced Concrete Under the Coupled Effects of Chloride Ingress and Static Loading: Laboratory Tests and Finite Element Analysis

Corrosion Characteristics of Reinforced Concrete Under the Coupled Effects of Chloride Ingress and Static Loading: Laboratory Tests and Finite Element Analysis

Influence of Pore Size and Fatigue Loading on NaCl Transport Properties in C-S-H Nanopores: A Molecular Dynamics Simulation

Molecular Dynamics Simulation of Reinforcing Steel Corrosion when Subjected to Both Chloride Attack and Mechanical Loading

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