Effect of High Temperature and High Pressure of Water on Micro-Characteristic and Splitting Tensile Strength of Gritstone

Zhao, Yu; Bi, Jing; Zhou, Xiaoping; Huang, Yansen

doi:10.3389/feart.2019.00301

Cited by 16 publications

(4 citation statements)

References 45 publications

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“…The failure mode of the rock mass was found to be shear failure when the intermediate principal stress was small, whereas the failure mode was plate fracture when the intermediate principal stress was large. Zhao et al (2019a) conducted Brazilian split tests on sandstone specimens treated with hot water to study the relationship between stress/strain and temperature. They also used SEM to observe the sandstone specimens treated at high temperature and high pressure.…”

Section: Introductionmentioning

confidence: 99%

Study on “Triaxial Loading-Unloading-Uniaxial Loading” and Microscopic Damage Test of Sandstone

et al. 2020

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To study the weakening process, deformation, and failure characteristics of rock masses surrounding deep chambers under complex stress environments, triaxial loading tests along with triaxial loading/unloading followed by uniaxial loading tests were conducted on sandstone specimens. The internal microcracks of the specimens under the loading and unloading of triaxial confining pressure were observed by scanning electron microscopy. The results revealed the inherent mechanism of plastic deformation (irreversible deformation) of the rock mass under different confining pressures. Under uniaxial loading and triaxial loading, the sandstone specimens exhibited X-shaped shear failure and single shear failure, respectively. In contrast, the sandstone samples subjected to the loading and unloading of triaxial confining pressure followed by uniaxial loading showed multiple shear fracture surfaces and fine fissures along the axial direction. A larger initial axial pressure of the sandstone specimen corresponded to a smaller uniaxial loading strength after unloading the confining pressure, a greater amount of plastic deformation, more macro-and microfissures, and more severe damage to the specimen. These results show that the final failure mode, strength, degree of damage, and plastic deformation of sandstone specimens are related to the stress state at the time of failure along with the loading history before failure.

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Section: Introductionmentioning

confidence: 99%

Study on “Triaxial Loading-Unloading-Uniaxial Loading” and Microscopic Damage Test of Sandstone

et al. 2020

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“…The hydraulic system was controlled by a computer, which sets the compression force and displacement rates during testing. The data acquisition system recorded the data from the laser displacement sensors and pressure transducer in real-time and stored the data for further analysis (Zhao et al;. During the test, the sample was compressed at a controlled rate, while the deformation and load were measured by the laser displacement sensors and pressure transducer respectively.…”

Section: Overview Of the Experimental Setupmentioning

confidence: 99%

Determination of the Poisson ratio of Dry Ice as a Function of its Density

Morka,

Umukoro,

Okeke

et al. 2024

NJP

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The Poisson ratio of dry ice in relation to its density was determined in this study. In recent years, many studies have shown that it is meaningful to place some materials under stress paths corresponding to various conditions. However, the deformation evolution of these materials with consideration to their mechanical behaviour and characteristics has rarely been studied. Therefore, knowledge of the Poisson ration allows engineers and scientists predict how materials deform, help to determine material elastic properties, materials compatibility, materials characterization and materials selection and design. The experimental methodology encompassed a comprehensive analysis of dry ice samples with varying densities. A series of controlled compression tests were performed on these samples using specialized equipment. The resulting data were collected and analyzed to obtain the Poisson ratio values corresponding to different density levels of dry ice. The findings of the study revealed a distinct relationship between the Poisson ratio and the density of dry ice, providing valuable insights into the mechanical properties of this material. The methodology and outcomes presented here contribute to a deeper understanding of the behaviour of dry ice under compressive loads, paving the way for potential applications in various fields requiring precise knowledge of its mechanical characteristics. The result obtained showed a consistent relationship between the Poisson ratio of dry ice and its density, such that as the Poisson ratio decreased its corresponding density increased. These findings not only enhance our understanding of dry ice's mechanical behavior but also offer insights into the broader interplay between density and Poisson ratio in materials, with potential implications for diverse industrial and scientific applications.

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“…Cementitious materials were subjected to a combination of high temperature and various types of loading failure, ultimately leading to building collapse, posing a significant threat to the safety of individuals and property (Khoury, 2000;Annerel and Taerwe, 2009;Du et al, 2018). Therefore, to further understand the mechanical properties of cement mortar in abnormal environments, it was essential to evaluate the residual properties after thermal damage (Lu et al, 2013;Mukesh and Shashank, 2019;Zhao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of thermally damaged mortar under coupled static-dynamic loading

Ying,

Chen,

Chen

et al. 2024

Front. Mater.

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In buildings that experience fires, cement mortar is subjected to high-temperature environments and not only the weight of the structure above but also blast loads, leading to structural damage and loss of load-bearing capacity. To investigate the static and dynamic mechanical properties of thermally damaged mortar, a series of tests utilizing modified split Hopkinson pressure bar were conducted. These tests included quasi-static, conventional dynamic and coupled static-dynamic loading tests on mortar specimens that were subjected to seven temperature levels: 20°C, 100°C, 200°C, 300°C, 400°C, 500°C, and 600°C. The test results revealed that both the thermal damage and loading method had an impact on the mechanical properties and damage characteristics of the mortar specimens. The compressive strength, elastic modulus and absorbed energy ratio of mortar decreased as temperature increased. Notably, the quasi-static strength loss rate was 60% when the temperature reached 600°C. Under coupled static-dynamic loading, the specimens exhibited higher strength, elastic modulus, reflected energy ratio, and transmitted energy ratio. Conversely, they had lower average strain rates and absorbed energy ratios. Intriguingly, the dynamic growth factor had a relative increase of 0.7–2.0 compared with other loading methods. Furthermore, the higher temperature, the higher fragmentation of the specimens in the fragmentation pattern. Conventional dynamic loading resulted in the greatest degree of fragmentation. The findings provide a scientific basis for the design and evaluation of concrete shockproof and explosion-resistant structures.

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Effect of High Temperature and High Pressure of Water on Micro-Characteristic and Splitting Tensile Strength of Gritstone

Cited by 16 publications

References 45 publications

Study on “Triaxial Loading-Unloading-Uniaxial Loading” and Microscopic Damage Test of Sandstone

Study on “Triaxial Loading-Unloading-Uniaxial Loading” and Microscopic Damage Test of Sandstone

Determination of the Poisson ratio of Dry Ice as a Function of its Density

Mechanical properties of thermally damaged mortar under coupled static-dynamic loading

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