Fully noncontact nonlinear ultrasonic characterization of thermal damage in concrete and correlation with microscopic evidence of material cracking

Yang, C. T.; Chen, Jun

doi:10.1016/j.cemconres.2019.105797

Cited by 45 publications

(9 citation statements)

References 39 publications

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“…The ultrasonic test has been effectively used for the evaluation of several types of concrete internal flaws, such as void detection [DON16] and cracking on concrete [YAN19]. A successful example of implementation was achieved on the evaluation of structures repair by comparing the pulse velocity of the structures before and after repair [AGG11].…”

Section: Ultrasonic Tomography On Concretementioning

confidence: 99%

nfluence of Measuring Points in Ultrasonic Tests on the Tomographic Image Quality of Concrete

Moura¹,

Carvalho²,

Ferreira³

2020

Computer Science Research Notes

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In the process of creating digital images of concrete, wave propagation can be used to generate a suitable inner representation of this element, producing an ultrasonic tomography. Although tomography devices are efficient in generating images, they are high-cost and not very accessible. On the other hand, images obtained through ultrasound tests allow identifying the presence of flaws in different types of materials at lower costs. In ultrasonic tests, ultrasonic wave velocity paths are generated from different measurement points. Thus, in order to improve the data range, interpolation techniques can be used to estimate the acoustic velocity at the unmeasured test points, completing the image creation process. This work aims to evaluate the influence on the quality of the generated image of (1) the spatial resolution and (2) the number of measurement points in the ultrasonic test. Experiments were carried out using Inverse Distance Weighting interpolation technique and ultrasonic tomography on concrete beams with and without flaws. The resulting images indicated the importance of the appropriate choice of number and arrangement of measuring points in the ultrasonic test to properly detect internal flaws. In addition, we verify that a higher spatial resolution may also interfere in the identification of internal flaws in the image.

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Section: Ultrasonic Tomography On Concretementioning

confidence: 99%

nfluence of Measuring Points in Ultrasonic Tests on the Tomographic Image Quality of Concrete

Moura¹,

Carvalho²,

Ferreira³

2020

Computer Science Research Notes

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“…Dong et al [20] studied the fracture process of the interface between shotcrete and rock, and found that under high temperature, the structure of shotcrete fracture surface was loose and powder particles increased. Yang et al [21] studied the internal damage mechanism of shotcrete under high temperature In Figure 1: a-Albert tunnel in Austria; b-Anfang highway tunnel in Japan; c-Sanhejian coal mine in China; d-Sangzhuling tunnel in China; e-Qinling tunnel of Xikang railway in China; f-Franco-Yibulangfeng highway tunnel; g-Kolar gold mine in India; h-Mponig gold mine in South Africa.…”

Section: Introductionmentioning

confidence: 99%

“…Dong et al [20] studied the fracture process of the interface between shotcrete and rock, and found that under high temperature, the structure of shotcrete fracture surface was loose and powder particles increased. Yang et al [21] studied the internal damage mechanism of shotcrete under high temperature based on CT technology and X-ray, and the results showed that the internal pores of shotcrete present the trend of small holes gradually developing into large pores with the increase of temperature.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure of Shotcrete under High Temperature

Liu

Zhao

Zhang³

et al. 2021

Applied Sciences

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High temperature is recognized as one of the extreme environments in the application of shotcrete which significantly deteriorate the performance of shotcrete. This paper reviews the mechanical properties and microstructure of shotcrete under high temperature. First of all, this paper reviews the cause of formation of high ground temperature. Based on these causes, the author establishes a heat transfer model with a spiral shape by introducing a multidimensional morphological formula into the heat conduction process. Then, the paper reviews the influence of high temperature on the mechanical and micro properties of shotcrete, the cooling technology under high temperature, and the optimization research technology of shotcrete. The author discusses the influence of high temperature on the thermal parameters and the deformation of shotcrete from the perspective of thermodynamics. Multiple studies have shown that the irregular movement and disorderly overlapping of molecules in the shotcrete caused by the high temperature environment result in the premature termination of the hydration reaction of cement in shotcrete. Finally, the author suggests the challenges of high-temperature shotcrete in term of the process structure, performance optimization, and application in special engineering fields. The research in this paper intends to give guidance to those conducting shotcrete research under high temperature, and to promote the further development of shotcrete technology.

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“…Concrete walls are commonly used as fences for private properties or building facades. However, cracks can appear in them due to thermal stress [ 1 , 2 , 3 , 4 , 5 , 6 ], inappropriate water-to-cement ratios [ 7 ] or inferior cement. Concrete walls can be separated into structural and non-structural walls.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Cracking Widths in a Concrete Wall Based on TIR Radiances of Cracking

2020

Sensors

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The techniques of concrete crack detection, as well as assessments based on thermography coupled with ultrasound, have been presented in many works; however, they have generally needed an additional source of thermal infrared (TIR) radiance and have only been applied in laboratories. Considering the accessibility of thermal infrared cameras, a TIR camera (NEC F30W) was employed to detect cracking in the concrete wall of an historic house with a western architectural style in Kinmen, Taiwan, based on the TIR radiances of cracking. An operation procedure involving a series of image processing and statistical analysis processes was designed to evaluate the performance of the TIR camera in the assessment of the cracking width. This procedure using multiple measurements was implemented from March to August 2019, and the t-tests indicated that the temperature differences between the inside and outline of the concrete cracks remained insignificant as the temperature or relative humidity (RH) in the subtropical climate rose. The experimental results of the operation procedure indicated that the maximum focusing range, which is related to the size of the sensor array, and the minimum detectable crack width of a TIR camera should be 1.0 m and 6.0 mm, respectively, in order to derive a linear regression model with a determination coefficient R2 of 0.733 to estimate the cracking widths, based on the temperature gradients. The validation results showed that there was an approximate R2 value of 0.8 and a total root mean square error of ±2.5 mm between the cracking width estimations and the observations.

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Fully noncontact nonlinear ultrasonic characterization of thermal damage in concrete and correlation with microscopic evidence of material cracking

Cited by 45 publications

References 39 publications

nfluence of Measuring Points in Ultrasonic Tests on the Tomographic Image Quality of Concrete

nfluence of Measuring Points in Ultrasonic Tests on the Tomographic Image Quality of Concrete

Mechanical Properties and Microstructure of Shotcrete under High Temperature

Assessment of Cracking Widths in a Concrete Wall Based on TIR Radiances of Cracking

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