Fractal Characterization of Non-Uniform Corrosion of Steel Bars in Concrete Beams after Accelerated depassivation and Seven-Year Natural Corrosion

Jiang, Haoyu; Jin, Nanguo; Ye, Hailong; Tian, Ye; Jin, Xianyu; Zeng, Qiang; Yan, Dongming; Xü, Xinsheng

doi:10.3390/ma12233919

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…The residual cross-sectional area reflecting the multi-dimensional corrosion loss on the whole circumference is more comprehensive than the corrosion depth and more straightforward than other corrosion indices [ 28 ]. To better understand the longitudinal corrosion distribution of steel rebars, Figure 5 shows the residual cross-sectional areas along the length of steel rebars with different corrosion levels within the parallel length.…”

Section: Corrosion Characteristicsmentioning

confidence: 99%

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Degradation of Steel Rebar Tensile Properties Affected by Longitudinal Non-Uniform Corrosion

2023

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Rebar corrosion is the primary cause of the durability degradation of reinforced concrete (RC) structures, where non-uniform corrosion is the typical pattern in engineering. This study experimentally and numerically investigated the tensile degradation properties of non-uniform corroded rebars. Corrosion morphology was accurately determined by three-dimensional (3D) laser scanning techniques, studying the characteristics of longitudinal non-uniform corrosion. The results showed that the non-uniformity of corrosion increased with an increase in corrosion levels. From tensile tests, the differences in nominal stress–strain curves among rebars with similar average corrosion levels indicated that corrosion non-uniformity has appreciable effects on the tensile behavior of rebars. The residual load-bearing capacity of corroded rebars was dominated by the reduced critical cross-section, while residual ductility was associated with the cross-section loss throughout the entire length of rebars. The degradation relations of nominal yield and ultimate strength, ultimate strain, and elongation after fracture were better correlated to the maximum cross-section loss than to the average volume loss. Additionally, numerical calculation based on the cross-sectional areas of corroded rebars was conducted to evaluate the tensile behavior of non-uniform corroded rebars. Equivalent distribution models simulating the longitudinal non-uniform corrosion were proposed, on the basis of probability characteristics of cross-sectional areas, for practical application of the numerical method.

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Section: Corrosion Characteristicsmentioning

confidence: 99%

“…Absolutely uniform corrosion is an ideal state that hardly exists in engineering. It is often observed that corrosion on the rebar surface is longitudinally and circumferentially non-uniform [ 28 , 29 ]. Furthermore, corrosion patterns influence the tensile properties of corroded rebars [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Steel Rebar Tensile Properties Affected by Longitudinal Non-Uniform Corrosion

2023

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“…In particular, the concrete members in the sulfuric acid or hydrochloric acid corrosion environment [1][2][3][4][5][6]. Several investigations indicated that acid corrosion had become one of the major threats affecting the mechanical properties of RC structures [7][8][9][10][11][12], resulting in the reduction of bearing capacity and ductility. Meanwhile, the double coupling actions of acid corrosion and load not only affected the durability of concrete structures but also made the calculation method used in the existing design no longer applicable to the concrete severely corroded by acid, endangering the safety of structures.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Properties and Constitutive Relationship of Concrete Corroded by Hydrochloric Acid under Cyclic Load

Cheng¹,

Shi

Liu³

et al. 2022

Sustainability

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Most of the existing studies on acid corrosion of concrete have focused on the mechanical behavior of concrete structures under monotonic load or without load. To investigate the mechanical properties of in-service concrete components under cyclic load in an acid corrosion environment, six groups of concrete prism specimens with different acid corrosion degrees (corrosion duration) were designed and prepared by the accelerated corrosion test method. The monotonic and cyclic axial compression load tests on these specimens were conducted to investigate the effects of corrosion degree on the mechanical properties of concrete specimens. The experimental results indicated that hydrochloric acid corrosion has obvious effects on the failure characteristics and mechanical properties of concrete. The surface of corroded concrete was easier to crack and spall under load, and the concrete spalling area enlarged as the acid corrosion duration increased. The compressive capacity of concrete specimens reduced rapidly with the increase in corrosion duration. The stress–strain envelope curves for concrete with different corrosion duration under cyclic load were essentially similar to that of concrete under monotonic load. The degradation rate of the descending section for the stress–strain curves of corroded concrete under cyclic load was much larger than that under the monotonic load due to the accumulation of internal damage in concrete. The peak strain and ultimate strain of corroded concrete increased significantly with the increase in corrosion duration and enhanced by 55.7% and 77.9%, respectively, compared with the uncorroded concrete, whereas the peak stress and elastic modulus rapidly decreased and reduced by 53.3% and 74.1%, respectively. Moreover, based on the strength degradation depth, the concept of effective bearing cross-sectional area ratio was proposed to characterize the corrosion degree of concrete, and the correction coefficient of descending section for the effective bearing cross-sectional area ratio was introduced to establish the constitutive model of corroded concrete under cyclic load, and the results calculated by this model matched well with the experimental values. The research in this paper can provide the experimental and theoretical basis for seismic life cycle and fatigue redesign of concrete structures in acid corrosion environments or coastal areas.

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“…Corrosion of steel is the major cause of deterioration in the serviceability and sustainability of reinforced concrete (RC) structures, especially for those in the chloride-laden environment [1][2][3]. As steel corrosion propagates, the volumetric expansion due to rust formation generates expansive pressure on the surrounding concrete and eventually leads to cracking and peeling-off of concrete cover [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Analysis of Corroded Reinforced Concrete Columns under Compressive Loading

Jin

et al. 2020

Sensors

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In this work, the failure process of non-corroded and corroded reinforced concrete (RC) columns under eccentric compressive loading is studied using the acoustic emission (AE) technique. The results show that reinforcement corrosion considerably affects the mechanical failure process of RC columns. The corrosion of reinforcement in RC columns leads to highly active AE signals at the initial stage of loading, in comparison to the non-corroded counterparts. Also, a continuous AE hit pattern with a higher number of cumulative hits is observed for corroded RC columns. The spatial distribution and evolution of AE events indicate that the reinforcement corrosion noticeably accelerates the initiation and propagation of cracking in the RC columns during compressive loading. The AE characteristics of corroded RC columns are in agreement with the macroscopic failure behaviors observed during the damage and failure process. A damage evolution model of corroded RC columns based on the AE parameters is proposed.

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Fractal Characterization of Non-Uniform Corrosion of Steel Bars in Concrete Beams after Accelerated depassivation and Seven-Year Natural Corrosion

Cited by 8 publications

References 32 publications

Degradation of Steel Rebar Tensile Properties Affected by Longitudinal Non-Uniform Corrosion

Degradation of Steel Rebar Tensile Properties Affected by Longitudinal Non-Uniform Corrosion

Study on Mechanical Properties and Constitutive Relationship of Concrete Corroded by Hydrochloric Acid under Cyclic Load

Acoustic Emission Analysis of Corroded Reinforced Concrete Columns under Compressive Loading

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