A Study on Correlation between Ultrasonic Pulse Velocity Method and Coarse Aggregate for Estimating Residual Modulus of Elasticity of Concrete Exposed to High Temperatures

Kim, Wonchang; Jeong, Keesin; Lee, Taegyu; Park, Sun-Gyu

doi:10.3390/app12136644

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…Figure 8 shows residual UPV by W/B following high-temperature exposure of NC and NSHC. The same W/B resulted in a similar trend for UPV regardless of NSH replacement, and as the temperature increased, UPV showed a continuously decreasing trend, unlike in the case of compressive strength [ 41 ]. At temperatures between 20 and 450 °C, active evaporation of free water and adsorbed water in concrete occurs, and voids are formed after water evaporation.…”

Section: Resultsmentioning

confidence: 99%

“…UPV is affected not only by the internal state of the specimen, such as cracks and voids, but also by the physical properties of the material such as density. Hwangto, which is less dense than cement, may contribute to a decrease in UPV, but at high temperatures, NSH forms aggregates, which improves UPV and results in similar behavior of residual UPV between NC and NSHC [ 40 , 41 , 42 ]. To accurately investigate the aforementioned phenomenon, further studies are required for a quantitative analysis of the correlation between the effects of NC cracks and voids and the effect of hwangto particles on UPV at high temperatures through microstructural analysis.…”

Section: Resultsmentioning

confidence: 99%

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Investigating Ultrasonic Pulse Velocity Method for Evaluating High-Temperature Properties of Non-Sintered Hwangto-Mixed Concrete as a Cement Replacement Material

2023

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Research on alternative cement materials is active worldwide, and in terms of fire safety, research on the evaluation of high-temperature properties of alternative materials is very important. Studies on concrete mixed with hwangto have been conducted by several researchers, but studies on high-temperature properties are lacking. Therefore, in this study, we evaluated the mechanical properties of concrete by partially replacing cement with non-sintered hwangto (NSH) at high temperatures. Normal concrete without NSH mixing and non-sintered hwangto concrete (NSHC) with HNT replacement were prepared as the specimens. The W/B of the concrete was set to 41 and 33, whereas the NSH replacement ratio was 15 and 30% of the cement. The target heating temperatures were set to 20, 100, 200, 300, 500, and 700 °C, and the heating rate was maintained at 1 °C/min. The following were calculated to evaluate the mechanical properties of the specimens: mass loss, compressive strength, ultrasonic pulse velocity (UPV), and modulus of elasticity. After analyzing the correlation between residual compressive strength and UPV, we proposed a compressive strength prediction model using different values of W/B for NSHC. Experimental results suggest that mass loss (%) shows a decreasing trend as NSH increases. In terms of residual compressive strength, residual compressive strength at W/B 41 increased with NSH replacement, whereas residual compressive strength values for W/B 33 were observed regardless of NSH replacement. Residual UPV showed a similar trend, regardless of the NSH replacement ratio, and residual modulus of elasticity was low at all W/B ratios as NSH replacement increased. A linear equation with a high correlation coefficient (R2) was proposed to predict compressive strength, and the linear value of W/B 41 was slightly higher than that of W/B 33.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Investigating Ultrasonic Pulse Velocity Method for Evaluating High-Temperature Properties of Non-Sintered Hwangto-Mixed Concrete as a Cement Replacement Material

2023

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“…The research in structural health monitoring through NDT has been increasing recently. (Kim et al (2022)) [ 5 ] conducted research to determine correlation between ultrasonic pulse velocity method and coarse aggregate for estimating residual modulus of elasticity of concrete exposed to high temperatures. Following a similar trend to the residual compressive strength, the ultrasonic pulse velocity and modulus of elasticity decreased as the temperature rose.…”

Section: Introductionmentioning

confidence: 99%

Framework for assessing bridge quality index based on the correlation of non-destructive test results

Pant,

Shrestha

2024

Heliyon

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Residual Compressive Strength Prediction Model for Concrete Subject to High Temperatures Using Ultrasonic Pulse Velocity

2023

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This study measured and analyzed the mechanical properties of normal aggregate concrete (NC) and lightweight aggregate concrete (LC) subjected to high temperatures. The target temperature was set to 100, 200, 300, 500, and 700 °C, and W/C was set to 0.41, 0.33 and 0.28 to evaluate high temperature properties at various intensities. Measurement parameters included mass loss, compressive strength, ultrasonic pulse velocity (UPV), and elastic modulus. We compared the residual mechanical properties between the target and preheating temperatures (20 °C) and then analyzed the correlation between UPV and compressive strength. According to the research findings, after exposure to high temperatures, LC demonstrated a higher mass reduction rate than NC at all levels and exhibited higher residual mechanical properties. The results of analyzing the correlation between compressive strength and UPV for concrete subjected high temperatures were very different from the compressive strength prediction equation previous proposed at room temperature, and the error range of the residual strength prediction equation considering W/C was reduced.

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A Study on Correlation between Ultrasonic Pulse Velocity Method and Coarse Aggregate for Estimating Residual Modulus of Elasticity of Concrete Exposed to High Temperatures

Cited by 6 publications

References 27 publications

Investigating Ultrasonic Pulse Velocity Method for Evaluating High-Temperature Properties of Non-Sintered Hwangto-Mixed Concrete as a Cement Replacement Material

Investigating Ultrasonic Pulse Velocity Method for Evaluating High-Temperature Properties of Non-Sintered Hwangto-Mixed Concrete as a Cement Replacement Material

Framework for assessing bridge quality index based on the correlation of non-destructive test results

Residual Compressive Strength Prediction Model for Concrete Subject to High Temperatures Using Ultrasonic Pulse Velocity

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