Effects of high temperatures on rocks

Li, Zhihuan

doi:10.32657/10220/46353

Cited by 1 publication

(1 citation statement)

References 156 publications

(212 reference statements)

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“…As the thin slices cannot easily distinguish the pore structure in the rock, the sandstone was impregnated with epoxy resin added with blue dye, in order to visually compare the size of the pores and cracks in the sandstone before and after heating. In this way, the blue resin highlighted the pores and cracks, and it was possible to analyze the pores and crack structures intuitively and clearly, as well as to estimate the porosity and other characteristics of the sandstone [32][33][34].…”

Section: Optical Microscopementioning

confidence: 99%

Effect of High Temperature (600°C) on Mechanical Properties, Mineral Composition, and Microfracture Characteristics of Sandstone

Zhang

2020

Advances in Materials Science and Engineering

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Rock destruction under high-temperature conditions is a key issue for nuclear waste treatment projects, underground coal gasification, and improvement of the use of geothermal energy for heating. Therefore, in this study, various methods and techniques were integrated to study the changes in mechanical properties, mineral composition, and microscopic fracture characteristics of Sichuan sandstone treated at 600°C. First, the fracture toughness and indirect tensile strength of untreated sandstones and high-temperature treated sandstones were tested by the MTS testing machine, and the double-K model (DKFM) was used to estimate the unstable fracture toughness. Then, the diffraction spectra of sandstone were analyzed with an X-ray diffractometer to determine the mineral composition change after heat treatment. Finally, the microscopic features of sandstone were observed through a scanning electron microscope (SEM) and optical microscope. The results show the following. (1) There is no significant change in the tensile strength and fracture toughness of Sichuan sandstone treated at 600°C. (2) The brittleness of Sichuan sandstone decreases and the ductility increases after high-temperature treatment. (3) The unstable fracture toughness value Kun obtained by the double-K model (DKFM) is significantly larger than the apparent fracture toughness value Kif. (4) After treatment at 600°C, the clay minerals in the sandstone changed significantly. Kaolinite is dehydroxylated to metakaolinite, which may increase the ductility of the rock.

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Section: Optical Microscopementioning

confidence: 99%

Effect of High Temperature (600°C) on Mechanical Properties, Mineral Composition, and Microfracture Characteristics of Sandstone

Zhang

2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

Effects of high temperatures on rocks

Cited by 1 publication

References 156 publications

Effect of High Temperature (600°C) on Mechanical Properties, Mineral Composition, and Microfracture Characteristics of Sandstone

Effect of High Temperature (600°C) on Mechanical Properties, Mineral Composition, and Microfracture Characteristics of Sandstone

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