Evaluation of stiffening behavior of concrete based on contactless ultrasonic system and maturity method

Hong, Jin-Young; Kim, Ryulri; Lee, Chang Hoon; Choi, Hajin

doi:10.1016/j.conbuildmat.2020.120717

Cited by 16 publications

(9 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are various nondestructive testing methods, including the impact elastic wave method [2,3], X-ray transmission [4,5], electromagnetic radar [6][7][8], and acoustic emission [9][10][11]. The ultrasonic test method is also used for concrete inspection [12][13][14], taking advantage of its better propagation when the object is densely concentrated, and the density distribution is stable.…”

Section: Introductionmentioning

confidence: 99%

Effect of Moisture Distribution on Velocity and Waveform of Ultrasonic-Wave Propagation in Mortar

Okazaki

Iwase²,

Nakagawa

et al. 2021

Materials

View full text Add to dashboard Cite

Considering that the ultrasonic method is applied for the quality evaluation of concrete, this study experimentally and numerically investigates the effect of inhomogeneity caused by changes in the moisture content of concrete on ultrasonic wave propagation. The experimental results demonstrate that the propagation velocity and amplitude of the ultrasonic wave vary for different moisture content distributions in the specimens. In the analytical study, the characteristics obtained experimentally are reproduced by modeling a system in which the moisture content varies between the surface layer and interior of concrete.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Moisture Distribution on Velocity and Waveform of Ultrasonic-Wave Propagation in Mortar

Okazaki

Iwase²,

Nakagawa

et al. 2021

Materials

View full text Add to dashboard Cite

show abstract

“…Based on Snell’s law, the velocity ratio influences the critical angle, and the velocity in cementitious materials is a function of time in this case. Choi et al and Hong et al experimentally demonstrated that the contactless ultrasonic method measured initial leaky Rayleigh waves with an incident angle of 5°, and the time was close to the final setting based on ASTM C 403 [ 3 , 16 , 17 ]. Therefore, an incident angle of 5° was chosen for the entire testing operation in this study.…”

Section: Methodsmentioning

confidence: 99%

“…A recently developed contactless ultrasonic method has significantly improved the practical application of monitoring the hardening of fresh concrete [ 16 , 17 ]. In this method, the leakage portion of Rayleigh waves is measured, in which the motion of Rayleigh waves is between shear and pressure waves.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Monitoring Hardening Behavior of Cementitious Materials Using Contactless Ultrasonic Method

Hong

Choi

2021

Sensors

Self Cite

View full text Add to dashboard Cite

We propose a novel contactless ultrasonic method for monitoring the hardening behavior of cementitious materials. The goal of this method is to obtain high-quality data to compare the unique hardening process between rapid setting cement (RSC) and ordinary Portland cement (OPC) mortars without physical coupling to the surface of the specimens. To monitor the hardening behavior of cementitious materials, conventional approaches use contact or embedded-type sensors, which limit field application. Our solution is to measure leaky Rayleigh waves at the interface between air and cementitious materials, which allows for the estimation of the physical state of the medium in real time. The modulus development was back-calculated based on the increment of wave velocity using the developed sensor array and transform-based signal processing. We experimentally demonstrated that the proposed method possibly exhibits unique hardening information about flash setting, effects of a retarder, and modulus increments from RSC specimens.

show abstract

“…Equivalent age is related to concrete maturity. e expression of maturity was shown in equation ( 4) by Bergstrom [28].…”

Section: Relationship Between Equivalent Age and Concretementioning

confidence: 99%

Temperature Field of Concrete‐Filled Steel Tubular Arch Bridges and Its Application

Zhou

Feng

Zhou

et al. 2022

Advances in Civil Engineering

View full text Add to dashboard Cite

This study aimed to reveal the evolution rule and influence mechanism of temperature field and its effect of long-span concrete-filled steel tubular arch bridges in a plateau area. The temperature field and its effect of large-diameter concrete-filled steel tubular arch bridges under strong radiation, hydration heat, and large temperature difference were studied using the ANSYS transient thermal analysis method. The optimization method on transverse perfusion sequence and perfusion-time interval considering temperature effect was proposed based on stress influence line, equivalent age theory, and energy method. Results showed that the temperature field along the radial direction distributes as a symmetrical three-segment polyline with an influence depth of D/4 under ambient temperature and hydration heat, and it distributes as an asymmetric three-segment polyline with an influence depth of D/8 under solar radiation, ambient temperature, and hydration heat, and this is smaller than the specified value of D/4. The maximum temperature on the sunny side is about 20°C higher than that on the shaded side. The influence of solar radiation absorption coefficient and ambient temperature on the maximum temperature gradient and maximum stress is greater than that of wind speed. The optimization method on transverse perfusion sequence and perfusion-time interval considering temperature effect proposed in this paper is reasonable and convenient for engineering applications.

show abstract

Evaluation of stiffening behavior of concrete based on contactless ultrasonic system and maturity method

Cited by 16 publications

References 39 publications

Effect of Moisture Distribution on Velocity and Waveform of Ultrasonic-Wave Propagation in Mortar

Effect of Moisture Distribution on Velocity and Waveform of Ultrasonic-Wave Propagation in Mortar

Monitoring Hardening Behavior of Cementitious Materials Using Contactless Ultrasonic Method

Temperature Field of Concrete‐Filled Steel Tubular Arch Bridges and Its Application

Contact Info

Product

Resources

About