Nondestructive Evaluation of Early-Age Concrete Strength in Plate Structures by the Impact-Echo Method

doi:10.14359/9811

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…As clearly shown in Fig. 3, the following exponential relationship between the wave velocity and the strength agrees with results proposed by previous research [6][7][8]. C).…”

Section: Test Results and Discussionsupporting

confidence: 91%

Evaluation of Concrete Properties by Stress Wave Propagation Methods

Lee

Park

et al. 2004

KEM

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This paper presents the experimental results obtained by elastic wave propagation methods such as ultrasonic pulse velocity (UPV) method and impact-echo (IE) method. They have been widely used to estimate concrete strength, modulus of elasticity, and Poisson's ratio as well as to diagnose the condition of concrete. In this study, the concretes with various water-cement ratios were made and then their longitudinal wave velocities were measured using the UPV and IE method, respectively. Moreover, the dynamic Poisson's ratio, static and dynamic modulus of elasticity, and velocity-strength relationship, were experimentally obtained. Test results showed that the UPV was greater than the wave velocity measured by IE method, i.e. rod-wave velocity and the difference between these two velocities decreased with the increase of age and strength of concrete. It was also observed that the Poisson's ratio and the modulus of elasticity determined by dynamic method were greater than those of determined by the static test. Consequently, for the more accurate estimation of concrete properties using the elastic wave velocities, the characteristic of these velocities should be understood.

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“…As clearly shown in Fig. 3, the following exponential relationship between the wave velocity and the strength agrees with results proposed by previous research [6][7][8]. C).…”

Section: Test Results and Discussionsupporting

confidence: 91%

Evaluation of Concrete Properties by Stress Wave Propagation Methods

Lee

Park

et al. 2004

KEM

View full text Add to dashboard Cite

show abstract

“…As shown in Fig. 4, the following exponential relationship between the wave velocity and the strength proposed by other researchers [10,11] is suitable for the data.…”

Section: Advances In Nondestructive Evaluationmentioning

confidence: 93%

Quality Control of In-Situ Concrete by Ultrasound Monitoring

Lee

2004

KEM

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In this study, an experimental work was carried out to measure the ultrasonic pulse velocity (UPV) of concrete having various water-binder ratios (w/b) and/or mineral admixtures including fly ash and blast-furnace slag at the laboratory. Moreover, a mock-up concrete wall was cast to investigate the evolution of UPV and the development of strength of in-situ concrete. Test results have shown that the UPV can be measured successfully before and after hardening of the concrete. The UPV curves expressed the behavior of concrete that were changing from a suspension to a solid structure during hardening process caused by the hydration of cementitious materials. Furthermore, these curves were also associated with the elastic properties and gave a comprehensive picture of the stiffening process. It is found that the hardening process and characteristics of concrete mixtures may be effectively investigated by monitoring of UPV. Consequently, ultrasound monitoring is promising for the quality control of concrete, particularly for in-situ concrete.

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Analysis method of impact echo based on variational mode decomposition

Xu¹,

Ren²,

Shen³

2018

J. vibroeng.

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The Impact Echo (IE) method is a widely used method for the detection of concrete structures. The signal has non-stationary characteristics. Empirical mode decomposition (EMD) is one of the typical ways of dealing with non-stationary signals. Due to EMD having mode overlap and a breakpoint effect, Variational Mode Decomposition (VMD) has been proposed to overcome these problems. In this study, VMD is introduced into the analysis of the concrete component detection signals, and the impact echo analysis method based on VMD and marginal spectrum is established. The proposed method to solve the marginal spectrum is used in order to analyze the numerical simulation model's IE signal. This method is able to correctly obtain the main frequency. When compared with the traditional Fourier spectrum, the marginal spectrum that is based on the VMD method shows that the band width that is present in the main frequency is narrow. Even in the presence of a highly noisy background, the method is able to correctly obtain the main frequency. At last, through the detection signal analysis of the non-defective concrete specimen and the concrete specimen with the circular hole, the results show that the proposed method can distinguish the signal in the different defective states of the concrete structures, which has obvious advantages compared with the Fourier spectrum.

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Nondestructive Evaluation of Early-Age Concrete Strength in Plate Structures by the Impact-Echo Method

Cited by 4 publications

References 9 publications

Evaluation of Concrete Properties by Stress Wave Propagation Methods

Evaluation of Concrete Properties by Stress Wave Propagation Methods

Quality Control of In-Situ Concrete by Ultrasound Monitoring

Analysis method of impact echo based on variational mode decomposition

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