Correlation analyses of effects of temperature on physical and mechanical properties of clay

Zhang, Weiqiang; Sun, Qiang; Zhang, Yuliang

doi:10.1007/s12665-018-7802-y

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…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%

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%

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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“…For simplicity, clay deterioration owing to water was modelled by reducing its Young's modulus. However, clay also shows other deterioration types, including plastic deformation, cracking, and breaking [48]. It is therefore noted that water induces slope displacement resulting from clay deterioration.…”

Section: Discussionmentioning

confidence: 99%

Displacement Measurements and Numerical Analysis of Long‐Term Rock Slope Deformation at Higashi‐Shikagoe Limestone Quarry, Japan

Amagu

Zhang

Kodama

et al. 2021

Advances in Civil Engineering

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The Higashi-Shikagoe limestone quarry is an open-pit mine situated in Hokkaido Prefecture, Japan, that has experienced four slope failure incidents since 1996. The rock slope behaviour has been monitored since the first failure event by measuring the rock slope surface displacement using an automated polar system. Recent measurements have revealed a gradual decrease of the distance between the beam generator and mirrors over time; however, the displacements and decrease rate differs between the centre and left- and right-hand sides of the quarry. This implies that the deformation characteristics of the rock slope and factors influencing the slope deformation differ at the centre and left- and right-hand sides of the quarry. In this study, the two-dimensional finite element method was used to identify the causes of slope deformation by investigating the effects of limestone excavation at the foot of the rock slope, the deterioration of a ∼70 m-thick clay layer at the rock slope foot wall, and shear failure owing to rainfall infiltration. The numerical results show that slope deformation on the left-hand side and centre of the quarry are induced by clay deterioration, whereas the right-hand side of the quarry is deformed owing to floor excavation and/or shear sliding. The rock slope is presently stable because the magnitude of the rate of displacement decrease is small and no acceleration is observed.

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The effect of high temperature on the fracture damage of loess

Song¹,

Yan

Duan

et al. 2022

Engineering Fracture Mechanics

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Correlation analyses of effects of temperature on physical and mechanical properties of clay

Cited by 5 publications

References 23 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

Displacement Measurements and Numerical Analysis of Long‐Term Rock Slope Deformation at Higashi‐Shikagoe Limestone Quarry, Japan

The effect of high temperature on the fracture damage of loess

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