Experimental analysis of the correlation between bending strength and SMFL of corroded RC beams

Qiu, Junli; Zhang, Zeyu; Zhou, Jianting; Ma, Hao; Liao, Leng

doi:10.1016/j.conbuildmat.2019.04.120

Cited by 36 publications

(14 citation statements)

References 30 publications

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“…On the other hand, some authors mounted salt solution tanks on top of the concrete cover [Malumbela et al 2010] or at the sides (Zhao et al 2019). Finally, salt contamination by using towels (Qiu et al 2019), sprinklers (Lu et al 2018) or sponges (Torres-Acosta et al 2007) were used.…”

Section: Accelerated Corrosionmentioning

confidence: 99%

Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations

Pregnolato

Winter

Sen

et al. 2021

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Section: Accelerated Corrosionmentioning

confidence: 99%

Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations

Pregnolato

Winter

Sen

et al. 2021

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“…Note that H z is the only component to be considered in this paper. The H z can be calculated as: Many recent studies [22,23] have shown that the component of SMFL signals in the Bx direction is uninterpretable. For the purpose of simplifying the problem in a reasonable way, the 3D model should be converted into a 2D model as shown in Figure 5.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…A possible correlation between the bearing capacity of the strand and the SMFL signal was also introduced in his study. Qiu [23] conducted a series of four-point experiments that focused on the bending strength of RC beams to estimate a possible correlation between the SMFL signals and the bearing capacity of RC beams. His works also confirmed that SMFL is hardly affected by stirrups.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Evaluation of Corrosion Degrees of Steel Bars Based on Self-Magnetic Flux Leakage

Yang

Qiu

Di³

et al. 2019

Metals

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Corrosion is among the most critical factors leading to the failure of reinforced concrete (RC) structures. Less work has been devoted to nondestructive tests (NDT) to detect the corrosion degree of steel bars. The corrosion degree was investigated in this paper using an NDT method based on self-magnetic flux leakage (SMFL). First, a mathematic model based on magnetic dipole model was settled to simulate the SMFL of a V-shaped defect caused by corrosion. A custom 3-axis scanning device equipped with a magnetometer was used to scan the SMFL field of the 40 corroded steel bars. Experimental data obtained by scanning the 40 steel bars showed that the BZ curve of SMFL was consistent with the theoretical model analysis. Inspired by the qualitative analysis of the results, an index “K” based on a large number of experimental data was established to characterize the corrosion degree of steel bars. The experimental index “K” was linearly related to the corrosion degree α of steel bars. This paper provides a feasible approach for the corrosion degree NDT, which is not affected by the magnetization history and the initial magnetization state of steel bars.

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“…In addition, when the MMM method is used for detection, it is not necessary to perform special pre-cleaning on the surface of the specimen to be inspected, and the detection time of the process can be shortened. During the whole detection process, the magnetic sensor is not in contact with the test piece, and is suitable for the stress detection of steel bars with a protective layer of concrete [34,35]. Furthermore, the equipment used for detecting stress by the MMM method is simple and light, easy in operation, high in computer-automatic acquisition and control degree, and fast in detection speed, so it is suitable for large-area detection [34,36].…”

Section: N S Stress Concentration Zonementioning

confidence: 99%

A New Method for Internal Force Detection of Steel Bars Covered by Concrete Based on the Metal Magnetic Memory Effect

Pang

Zhou

Zhao

et al. 2019

Metals

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In this paper, the specimens of steel bars covered by concrete (SBCC) are taken as research objects, and a new method for steel bar internal force detection based on the metal magnetic memory effect is proposed. The variation law of the self-magnetic flux leakage (SMFL) signals on the surfaces of SBCC specimens with loading tension and the variation of the SMFL signals along the axial positions of specimens under different tensile forces are studied. The results show that when the loading tension is about 90% of the yield tension, the tangential component of the SMFL signal has a maximum extreme point. The distribution of the SMFL signals along the axial position shows a smooth curve, where the values at both ends are small while the intermediate values are large. This paper also proposes the use of the "area ratio deviation parameter" to quantitatively calculate the internal forces of the steel bars. This parameter shows a significant linear relationship with the loading tension during the strengthening stage of the specimens. This method can supplement the existing steel bar stress detection methods and has prospective research value. damage detection (destruction, semi-destruction) and non-destructive detection [5,6]. Compared with damage detection, non-destructive detection has the advantages of high precision, small error, and no destruction to the structure, so it is used more now [7]. The traditional non-destructive stress detection methods, such as ultrasonic testing [8,9], eddy current testing [10,11], and X-ray testing [12,13], cannot detect early damage of steel bars [14]. In order to accurately detect the early damage of metal materials by means of non-destructive detection, some effective and new methods based on the physics have come into being [15][16][17]. Metal magnetic memory (MMM) detection technology is one of them [18,19], which was first proposed by Russian scholar Dubov [20]. The basic principle of MMM detection can be summarized as follows: Ferromagnetics indicate that magnetism is a basic property of matter, and that any substance is magnetic. When putting any substance in a magnetic field, under the action of a magnetic field, the substance will be magnetized. The reason why a substance is magnetic is because there is a phenomenon in which electrons rotate and spin around the nucleus, and the magnetic properties of the substance can be quantified by magnetic moments [21,22]. The steel bars in reinforced concrete structures are typical metal materials, and their interior structure can be regarded as being composed of many magnetic domains. The interface between the magnetic domains is called the magnetic domain wall [23]. When subjected to the geomagnetic field, the steel bars are magnetized to excite the magnetic fields around themselves, which form the initial magnetic fields under the action of the geomagnetic field. When the steel bars are subjected to the external tension, under the action of the tensile forces and the geomagnetic field, the magnetic domain structures orient and irre...

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Experimental analysis of the correlation between bending strength and SMFL of corroded RC beams

Cited by 36 publications

References 30 publications

Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations

Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations

Quantitative Evaluation of Corrosion Degrees of Steel Bars Based on Self-Magnetic Flux Leakage

A New Method for Internal Force Detection of Steel Bars Covered by Concrete Based on the Metal Magnetic Memory Effect

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