Flexural Characteristics Evaluation for Reinforced Concrete Affected by Steel Corrosion Based on an Acoustic Emission Technique

Zhang, Yu-Wei; Tan, Guojin; Wang, Shurong; Cheng, Yongchun; Yang, Shuting; Sun, Xiaohao

doi:10.3390/app9081640

Cited by 7 publications

(7 citation statements)

References 29 publications

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“…According to our previous studies [ 8 , 9 ], using the electrochemical test methods could measure the corrosion current densities of steel bar which embedded in concrete more exactly; by this, theoretical corrosion volume of steel bar could be obtained after measuring the corrosion current densities of steel bar by

where δ t is theoretical corrosion volume of steel bar, in cm; M is the atomic weight of the steel bar (56 g/mol); i corr is the corrosion current density of steel bar, in μA/cm 2 ; t is corrosion time, in a; n is the ionic charge number of steel (2); ρ s is the density of steel bar (7.86 g/cm 2 ).…”

Section: Resultsmentioning

confidence: 99%

“…According to our previous study [ 9 ], before specimen preparation, all the steel bars were polished with emery paper to dissolve the rust, then ethanol and acetone treatments were used to degrease their surfaces. Subsequently, steel bars should be cleaned with clear water and then dried at 20 °C for 4 h. After that, the mass and length of each steel bar should be tested for obtaining the average line density of all the steel bars.…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…Nowadays, engineers and researchers have recognized that steel corrosion is a major factor that deteriorates the durability of RC structures [3][4][5]. In the past, the method for corrosion assessment of steel bars embedded in the RC structure is destructive (such as the steel mass loss measurement after core sampling [6,7]), which is harmful and uneconomical to the RC structures [8,9]. This problem motivated the interest in utilizing nondestructive techniques for structural health monitoring; and the main purpose of structural health monitoring is to detect structural damage and reduce the risk of structural failure which may lead to casualties and property losses.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Natural Frequency Response Evaluation for RC Beams Affected by Steel Corrosion Using Acceleration Sensors

Zhang

Cheng

Tan

et al. 2020

Sensors

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This paper presented a laboratory investigation for analyzing the natural frequency response of reinforced concrete (RC) beams affected by steel corrosion. The electrochemical acceleration technique induced the corroded RC beams until the predetermined value of the steel corrosion ratio was achieved. Then, the natural frequency responses of the corroded beams were tested utilizing piezoelectric acceleration sensors. The damage states of the corroded beams were assessed through the measurement of crack parameters and the equivalent elastic modulus of the beams, which aims to clarify the fundamental characteristics of the dynamic response for the corroded RC beam with the increased steel corrosion ratio. The results revealed that steel corrosion reduces the bending stiffness of the RC beams and, thus, reduces the modal frequency. The variation of natural frequency can identify the corrosion damage even if no surface cracking of the RC beam, and the second-order frequency should be more indicative of the damage scenario. The degradations of stiffness and the natural frequency were estimated in this study by the free vibration equation of a simply supported beam, and a prediction method for the RC beam’s residual service life was established. This study supports the use of variations in natural frequency as one diagnostic indicator to evaluate the health of RC bridge structures.

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Section: Resultsmentioning

confidence: 99%

Section: Materials and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Natural Frequency Response Evaluation for RC Beams Affected by Steel Corrosion Using Acceleration Sensors

Zhang

Cheng

Tan

et al. 2020

Sensors

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“…Other scholars also studied the static fracturing of rock and concrete under the effect of SCDAs and derived some important conclusions [18][19][20]. As for research on the AE characteristics associated with the static fracturing process in concrete, most of the existing studies have focused on AE in concrete under loading conditions [21][22][23][24][25][26][27]. Little research has been conducted on AE in concrete during static fracturing.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Characteristics of Normal and Layered Concrete Blocks during Dilating/Static Fracture

Zhang

2020

Advances in Materials Science and Engineering

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Static fracturing technology is one of the most effective methods for localized breaking of rock and concrete. Layered concrete and rock structures are commonly seen in engineering applications such as breaking of concrete buildings, stone cutting, and excavation of rock in underground spaces. Therefore, it is essential to study the static fracturing characteristics of layered concrete to ensure the safety of engineering construction processes. In this paper, using acoustic emission (AE) technology and surface displacement monitoring, the deformation and fracturing of ordinary-strength concrete, concrete with a soft interlayer, and layered concrete (with strength decreasing successively by layer) were studied under the effect of a static (or soundless) cracking agent (SCA). The experimental results indicated that (1) AE activity of the two layered concrete test blocks during static fracturing showed a gradually increasing trend, while that of the ordinary-strength concrete tended to first increase and then decrease; (2) for the concrete test block with a soft interlayer sandwiched by high-strength layers, the AE events reached a maximum in the transfer of expansion pressure stage, which accounted for 47.11% of the total value in static cracking; the macroscopic damage to layered concrete test blocks comprising multiple interlaid layers with different strengths mainly occurred in the fracturing stage, during which the AE events and AE energy accounted for 76.22% and 66.94%, respectively, of those in the whole static fracturing process; and (3) the duration of static fracturing prolonged with the increase of the overall strength of the concrete test blocks. The results provide a useful experimental reference for the application of static fracturing technology in the breaking of layered concrete and rock.

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“…The stress concentration caused by corrosion pits can dramatically influence the basic macroscopic mechanical properties of a steel [20]. Despite the extensive research on the corrosion of metallic alloys [21,22,23,24], there are few detailed studies of the effect of pre-corrosion pits on residual fatigue life for 42CrMo steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Corrosion Pits on Residual Fatigue Life for 42CrMo Steel

Liu

Xie

et al. 2019

Materials

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The effect of pre-corrosion pits on residual fatigue life for the 42CrMo steel (American grade: AISI 4140) is investigated using the accelerated pre-corrosion specimen in the saline environment. Different pre-corroded times are used for the specimens, and fatigue tests with different loads are then carried out on specimens. The pre-corrosion fatigue life is studied, and the fatigue fracture surfaces are examined by a surface profiler and a scanning electron microscope (SEM) to identify the crack nucleation sites and to determine the size and geometry of corrosion pits. Moreover, the stress intensity factor varying with corrosion pits in different size parameters is analyzed based on finite element (FE) software ABAQUS to derive the regression formula of the stress intensity factor. Subsequently, by integrating the regression formula with the Paris formula, the residual fatigue life is predicted and compared with experimental results, and the relationship of the stress intensity factor, pit depth, and residual fatigue life are given under different corrosion degrees. The fatigue life predicted by the coupled formula agrees well with experiment results. It is observed from the SEM images that higher stress amplitude and longer pre-corroded time can significantly decrease the residual fatigue life of the steel. Additionally, the research work has brought about the discovery that the rate of crack extension accelerates when the crack length increases. The research in this paper also demonstrates that the corrosion pit size can be used as a damage index to assess the residual fatigue life.

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Flexural Characteristics Evaluation for Reinforced Concrete Affected by Steel Corrosion Based on an Acoustic Emission Technique

Cited by 7 publications

References 29 publications

Natural Frequency Response Evaluation for RC Beams Affected by Steel Corrosion Using Acceleration Sensors

Natural Frequency Response Evaluation for RC Beams Affected by Steel Corrosion Using Acceleration Sensors

Acoustic Emission Characteristics of Normal and Layered Concrete Blocks during Dilating/Static Fracture

Effect of Pre-Corrosion Pits on Residual Fatigue Life for 42CrMo Steel

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