Micro-damage evolution and macro-mechanical property of preloaded sandstone subjected to high-temperature treatment based on NMR technique

Shen, Mingxuan; Zhao, Yu; Bi, Jing; Wang, Chaolin; Ning, Lin; Deng, Xin; Zhang, Kun; Du, Bin

doi:10.1016/j.conbuildmat.2023.130638

Cited by 18 publications

(4 citation statements)

References 45 publications

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“…In low-field NMR, the surface relaxation dominates T 2 . [57][58][59] Meanwhile, the surface volume ratio of pore dominates the surface relaxation. Therefore, the T 2 can be obtained as…”

Section: Effects Of Cyclic Number On Porosity and Fractal Dimensionmentioning

confidence: 99%

Evolution of mechanical properties and microstructure in thermally treated granite subjected to cyclic loading

Fan,

Wang,

Qiu

et al. 2024

Fatigue Fract Eng Mat Struct

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In high‐temperature geological engineering applications, cyclic loads induced by various factors (e.g., earthquakes, excavation, and blasting) can exacerbate the thermal damage of engineered rock formations. Therefore, this study investigates the mechanical properties and microstructure evolution of thermally treated granite subjected to cyclic loading. First, the mechanical property variations of thermally treated granite under cyclic loading were studied through cyclic loading experiments. Subsequently, nuclear magnetic resonance (NMR) was employed to examine the microstructure evolution of thermally treated granite under cyclic loading. Lastly, the effects of cyclic loading on maximum strain, Young's modulus, pore size distribution, and porosity of thermally treated granite were discussed. Results indicate that at the same number of cycles, maximum strain increases with increasing temperature, while Young's modulus decreases. For granite subjected to the same thermal treatment, the maximum strain increases as the cyclic number increases, while Young's modulus decreases. Concurrently, porosity and fractal dimension initially decrease and then increase with a rising number of cycles.

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“…In low-field NMR, the surface relaxation dominates T 2 . [57][58][59] Meanwhile, the surface volume ratio of pore dominates the surface relaxation. Therefore, the T 2 can be obtained as…”

Section: Effects Of Cyclic Number On Porosity and Fractal Dimensionmentioning

confidence: 99%

Evolution of mechanical properties and microstructure in thermally treated granite subjected to cyclic loading

Fan,

Wang,

Qiu

et al. 2024

Fatigue Fract Eng Mat Struct

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“…The loading process of the model is accompanied by energy changes, mainly in the form of energy accumulation, dissipation and release 40 – 43 . The accumulation of dissipation energy of the sample can cause damage to the material of the combined body.…”

Section: Numerical Simulationmentioning

confidence: 99%

Experimental and numerical investigation of the mechanical properties and energy evolution of sandstone–concrete combined body

Yuan,

Du,

Shen

2024

Sci Rep

Self Cite

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Studying the mechanical properties of rock–concrete combined body is crucial to ensure the safety and stability of engineering structures. In this paper, laboratory tests and numerical simulations are used to investigate the mechanical properties of the sandstone–concrete combined body. Uniaxial compression tests and an acoustic emission monitoring system are used to analyze the failure characteristics of the sandstone–concrete sample and to validate the accuracy of the numerical model. The mechanical properties of the composite body were further analyzed by integrating energy and damage theories. The results of the sandstone–concrete study suggest that the combined sandstone–concrete body exhibits synergistic deformation and failure when subjected to uniaxial compression. The peak stress and elastic modulus fall between those of sandstone and concrete. The interface's shape causes the stress in the y-direction to transition from tensile stress to compressive stress. Energy is stored before reaching the peak stress and released after reaching the peak stress. The damage curve indicates that the damage increases gradually with the strain, and it results in plastic failure. In the numerical simulation of triaxial compression, the stress and displacement at the interface are evenly distributed. Compared to uniaxial compression, the energy of each component is higher and shows a linear positive correlation with confining pressure. Additionally, the rate of energy dissipation increases with higher confining pressure. The damage variable also increases with the increase in confining pressure, and the plastic failure process is also apparent under triaxial compression.

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“…When the temperature was lower than the threshold temperature of 500℃, the porosity and pore connectivity did not change much; when the temperature was higher than 500℃, the sandstone's mesopore and macroporous-fracture content increased significantly, and the pore-fracture connectivity. Shen et al (Shen et al, 2023)used NMR to examine the microstructural development of pre-loaded sandstone specimens at 25°C, 200°C, 400°C, 600°C, and 800°C. The size and quantity of holes and fractures in the specimens steadily grew following the heat treatments, indicating that high temperatures had a substantial influence on the sandstone's micro-damage.…”

Section: Introductionmentioning

confidence: 99%

Multi‑scale Experimental Investigations on the Deterioration Mechanism of Sandstone after high-temperature treatment

Zhang,

Song,

Ren

et al. 2023

Preprint

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With the continuous construction and development of deep engineering, in order to study the macro-damage and micro-change of temperature on sandstone, this paper conducts a series of Uniaxial Compressive Strength (UCS) tests, Acoustic Emission (AE) monitoring and Nuclear Magnetic Resonance (NMR) experiments on white sandstone treated at 25℃, 100℃, 300℃, 500℃ and 700℃. The study shows that the peak stress of the white sandstone specimens decreases with increasing temperature, and the corresponding axial strain increases significantly. The decrease in uniaxial compressive strength and modulus of elasticity increased sharply. The brittle-ductile transition occurs at about occurs between 500°C ~ 700°C. At temperatures between 25°C and 500°C, the peak AE energy occurs near the peak strength of the sandstone. The ringing counts of the sandstone specimens reached a maximum after the peak stress when the temperature was 700°C, and the peak AE energy gradually decreased at higher heating temperatures. The T2 spectrum curve and pore size curve of the white sandstone increased and gradually shifted to the right with the increase of the treatment temperature, and the total area of the T2 spectrum and porosity also gradually increased. There is a negative correlation between porosity and total area of T2 spectrum and peak stress and elastic modulus of white sandstone under high temperature. The micropores showed a monotonically decreasing trend with increasing temperature, the mesopores showed a trend of decreasing, then increasing, and finally decreasing, and the macropores-cracks enlarged the most.

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Micro-damage evolution and macro-mechanical property of preloaded sandstone subjected to high-temperature treatment based on NMR technique

Cited by 18 publications

References 45 publications

Evolution of mechanical properties and microstructure in thermally treated granite subjected to cyclic loading

Evolution of mechanical properties and microstructure in thermally treated granite subjected to cyclic loading

Experimental and numerical investigation of the mechanical properties and energy evolution of sandstone–concrete combined body

Multi‑scale Experimental Investigations on the Deterioration Mechanism of Sandstone after high-temperature treatment

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