Estimation of Thickness of Concrete Structures using the Impact Echo Method and Ultrasonic Pulse Velocity Method

Hong, Seong-Uk; Lee, Yongtaeg; Kim, Seunghun; Lee, Chang-Sik

doi:10.5659/aikar.2016.18.4.179

Cited by 5 publications

(3 citation statements)

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“…This is mainly because the high-temperature steam environment accelerates the hydration reaction of cement clinker, promotes the formation of gel, such as The apertures could be divided into harmless pores (apertures less than 20 nm), less harmful pores (apertures of 20-50 nm), harmful pores (apertures of 50-200 nm), and more harmful pores (apertures larger than 200 nm). Some studies have shown that pore diameters less than 50 nm have no effect on the performance of concrete and even can improve the performance (Hong et al, 2018;Qiu et al, 2019). However, pore diameters greater than 100 nm have a greater adverse effect on the performance of concrete.…”

Section: Analysis Of Test Results Of Concrete Pore Structurementioning

confidence: 99%

The effect of pore characteristics on the bonding properties of steam-cured concrete and GFRP bars

et al. 2023

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Steam cured concrete prefabricated components has the advantages of short construction period, less environmental pollution, convenient construction and low cost, and is widely used in high-speed railway projects. However, the changes of later strength, capillary water absorption and pore distribution led to the reduction of durability of steam-curing concrete and accelerated the damage speed of GFRP bars and bond performance between concrete and GFRP bars. In this study, the method of steam curing is adopted to simulate the damage of components caused by actual steam curing environment. The influence of pore characteristics on the bonding properties of steam cured concrete and GFRP steel bar is analyzed from both micro and macro perspectives. Analysis method combining pore characteristics with bonding strength. The test results showed that the hydration products of concrete were unaffected, but the density of the hydration products changed due to the steam curing. The porosity of the steam-cured concrete was much higher than that of the standard-cured concrete. The number of gel pores smaller than 20 nm accounted for 12.27% of the total number of pores on average, which was about twice the proportion of the gel pores of this size in the standard-cured concrete. The proportion of harmful voids with pore size of 50–200 nm and greater than 200 nm is higher than that of standard curing concrete. The bond strength of the steam-cured concrete and GFRP bars was 30% lower than that of the standard-cured concrete. With the change of the thickness of the concrete cover and the diameter of GFRP bars, the bond strength changed significantly. Based on the analysis of the test data, a predictive model of the bond strength deterioration for the steam-cured concrete and GFRP bars was established. The model fully accounted for influence factors such as the porosity, diameter, anchor length, and concrete strength.

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Section: Analysis Of Test Results Of Concrete Pore Structurementioning

confidence: 99%

The effect of pore characteristics on the bonding properties of steam-cured concrete and GFRP bars

et al. 2023

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“…In 2018, Panedpojaman and Tonnayopas (2018) conducted research on estimating the residual compressive strength of concrete after a fire using the concrete surface hardness [9]. Hong et al (2016) and Hong and Cho (2006) conducted research on estimating the thickness of concrete as well as the defect locations inside a slab for concrete structures using the ultrasonic pulse velocity method and impact echo method [10,11]. In 2014, Azari, Nazarian and Yuan (2014) conducted research on the benefits of combining the impact echo method and the method of ultrasonic surface waves [4].…”

Section: Literature Reviewmentioning

confidence: 99%

Evaluation of Condition of Concrete Structures Using Ultrasonic Pulse Velocity Method

et al. 2020

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The purpose of this study is to estimate the compressive strength according to the age of the concrete structure using ultrasonic pulse velocity method. If the correlation between the ultrasonic pulse velocity and the compressive strength according to the age is derived, the compressive strength of the early age of the concrete structure can be estimated at the new construction site and the compressive strength of the existing structure can be estimated at the remodeling construction site. Concrete structural specimens were constructed with 123 specimens by setting 9 parameters based on the design compressive strength of 24, 30, 40 MPa at 16, 20, 24, 48, 72, 120, 168, 360, 672 h. For the calculation of the average ultrasonic velocity according to the age of concrete, it is carried out according to KS F 2731, ASTM C597 and ACI 228-2R, and the concrete compressive strength is carried out according to KS F 2405. From correlation between ultrasonic pulse velocity and compressive strength, this experiment suggests compressive strength estimation equation. The proposed estimation equation confirmed that it is possible to estimate the compressive strength of concrete according to its age using nondestructive test methods.

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“…IE is also easy to handle and simple. The ultrasonic method is only suitable for dual-faceted detection [6,7]. But IE can be used in single-faceted detection.…”

Section: Introductionmentioning

confidence: 99%

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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Estimation of Thickness of Concrete Structures using the Impact Echo Method and Ultrasonic Pulse Velocity Method

Cited by 5 publications

References 0 publications

The effect of pore characteristics on the bonding properties of steam-cured concrete and GFRP bars

The effect of pore characteristics on the bonding properties of steam-cured concrete and GFRP bars

Evaluation of Condition of Concrete Structures Using Ultrasonic Pulse Velocity Method

Analysis method of impact echo based on variational mode decomposition

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