On-site damage evaluation of cracked irrigation infrastructure by acoustic emission and related nondestructive elastic wave method

Suzuki, Tetsuya; Shimamoto, Yuma

doi:10.1007/s10333-019-00726-1

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…The following works (Suzuki et al, 2010;Suzuki and Ohtsu, 2014;Karcili et al, 2016;Suzuki et al, 2020) include the specially developed method for quantitative damage evaluation which is based on estimating the intact modulus of elasticity of concrete. By authors of the works (Suzuki and Ohtsu, 2016;Suzuki and Shimamoto, 2019), it was determined that the dynamic modulus of elasticity is the most useful parameter for damage evaluation of concrete because it is correlated with inner damage of the material. The dynamic parameter of the concrete can be measured in two non-destructive ways (Eiras et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Visualization and evaluation of concrete damage in-service headworks by X-ray CT and non-destructive inspection methods

Morozova

Shibano

Shimamoto

et al. 2022

Front. Built Environ.

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The durability of concrete irrigation infrastructures decreases easily due to environmental effects, such as the freeze-thawed process. The degree of damage in concrete is, in most cases, evaluated by an unconfined compression test or ultrasonic test. The limiting states of structures are the result of a gradual accumulation of microdefects during the in-service period, which leads to the initiation and development of macroscopic cracks, loss of performance, and Failure. Therefore, to maintain such structures, it is necessary to properly determine the degree of damage by non-destructive testing. For effective maintenance and management of in-service structures, it is necessary to evaluate not only such mechanical properties as strength but also the degree of damage. Quantitative damage evaluation of concrete is proposed by applying the X-ray CT method and related non-destructive inspection, which is based on estimating cracking damage effects. In this study, the damage evaluation of concrete-core samples is investigated by X-ray CT parameters and the non-destructive parameters. The samples tested were taken from the damaged concrete headwork in Niigata, Japan, about 50 years after its construction. The geometric properties of the concrete matrix were calculated by the analysis of X-ray CT images. After X-ray CT measurement, an ultrasonic test and a resonant frequency test were performed. The dynamic modulus of elasticity was calculated by using ultrasonic pulse velocity and resonant frequency. As a result, based on the relationship between the geometric properties of the concrete matrix and the non-destructive parameters, the accumulation of damage in the samples tested was correlated with the ratio of the total area of cracks to the observation area. In damaged conditions, the high value of its ratio is demonstrated under low ultrasonic pulse velocity. These results suggest that the most sensitive components in a concrete body to the degree of damage are cracks in mortar and the ratio of the total area of cracks to the observation area. These values are affected by the internal actual cracks. Thus, the damage of concrete could be quantitatively evaluated by the geometric properties of the concrete matrix and its physical properties.

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Section: Introductionmentioning

confidence: 99%

Visualization and evaluation of concrete damage in-service headworks by X-ray CT and non-destructive inspection methods

Morozova

Shibano

Shimamoto

et al. 2022

Front. Built Environ.

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“…Visual inspection, X-ray computed NDT-CE 2022 -The International Symposium on Nondestructive Testing in Civil Engineering Zurich, Switzerland, August 16-18, 2022 2 tomography (CT), ultrasonic pulse velocity, resonant frequency and acoustic emission (AE) are useful approaches in this field. By the authors, some studies use the combination of the X-ray CT with the acoustic emission technique for quantitative estimation of concrete damage because AE generating behaviour is closely associated with the formation process of microcracks in concrete [5].…”

Section: Introductionmentioning

confidence: 99%

Detection of Concrete Damage by X-ray CT and Related Non-destructive Elastic Wave Monitoring in Core Test

Suzuki¹,

Morozova²,

Shimamoto³

et al. 2022

eJNDT

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As a detailed inspection of a concrete structure in service, core samples are usually drilled out and then mechanical properties are measured. In this study, damage estimation of freeze-thawed concrete from concrete-core samples is developed, applying X-ray CT with machine learning method. By the authors, the quantitative damage evaluation of concrete has been proposed by applying acoustic emission and damage mechanics in core concrete. In this study, detection of cracking damage distribution in concrete-core by decision tree method. Prior to the machine learning analysis, distribution of micro-cracks in a concrete-core sample is inspected by helical X-ray computer tomography (CT). Two feature values are set as explanatory variables: luminance value and pixel value after DoG (Difference of Gaussian) filter. The evaluation values converged from the sample size of 12,000 or more. This suggests that one cross section can be estimated with about 50% of the X-ray CT image data by using machine learning. The accuracy rate is 0.723 for the threshold processing and 0.793 for the decision tree method, which is higher for the decision tree method. These results suggest that the proposed method is useful for identifying cracks in concrete by X-ray CT image.

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“…For instance, Henry et al [ 26 ] carried out a nondestructive test on the internal microstructure of high-strength concrete by computed tomography (CT) technology and analyzed the influences of heating and re-curing on microstructural characteristics. Suzuki et al [ 27 ] analyzed the fracture distributions of concrete after the freezing–thawing cycle by CT technology and evaluated concrete damage by combining acoustic emission features.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle

Chen

Ren

et al. 2021

Materials

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The aim of this study was to reveal the macroscopic and mesoscopic deterioration behaviors of concrete under the coupling effect of chlorine salt erosion and the freezing–thawing cycle. The rapid freezing–thawing test was carried out in a 5% chlorine salt environment. The macroscopic characteristics of concrete were analyzed by testing the mass, the relative dynamic modulus of elasticity, and the compressive strength of concrete under different freezing–thawing cycles. Using CT scanning technology and three-dimensional reconstruction technology, the pore structure, CT value, and surface deviation of concrete before and after freezing–thawing were analyzed. Based on the changes of solid volume, pore volume, and solid CT value of concrete, the calculation method of relative CT value was proposed, and the damage model was established with relative CT value as the damage variable. The results demonstrate that the mass loss rate decreases in the beginning and then increases in the process of chlorine salt erosion and freezing–thawing, and the smaller the concrete size, the greater the mass loss rate. The relative dynamic modulus of elasticity decreases gradually, slowly at the initial stage and then at a faster rate, and the compressive strength loss rate increases gradually. The pore quantity, porosity, and volume loss rate of concrete increase in a fluctuating manner, whereas the relative CT value decreases. The comprehensive analysis shows that the chlorine salt frost resistance of concrete is negatively related to the water-cement ratio when the freezing–thawing cycle is fixed. The damage model could better reflect the freezing–thawing damage degree of concrete with different water cement ratios, and the damage evolution process is well described by the Weibull function.

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On-site damage evaluation of cracked irrigation infrastructure by acoustic emission and related nondestructive elastic wave method

Cited by 7 publications

References 8 publications

Visualization and evaluation of concrete damage in-service headworks by X-ray CT and non-destructive inspection methods

Visualization and evaluation of concrete damage in-service headworks by X-ray CT and non-destructive inspection methods

Detection of Concrete Damage by X-ray CT and Related Non-destructive Elastic Wave Monitoring in Core Test

Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle

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