Relationships between P-wave velocity and mechanical properties of granite after exposure to different cyclic heating and water cooling treatments

Zhu, Zhennan; Ranjith, P.G.; Tian, Hong; Jiang, Guosheng; Dou, Bin; Mei, Gang

doi:10.1016/j.renene.2020.12.048

Cited by 40 publications

(16 citation statements)

References 45 publications

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“…P-wave velocity values decrease similarly in this research and the examined literature [14,[54][55][56][57]. Ultrasound velocities gradually decrease from room temperature to 200-300 • C, followed by a rapid fall in velocity values from 400 • C to 800 • C, as reported before (Figure 13).…”

Section: Resultssupporting

confidence: 88%

“…Volume increased from 22 • C to 250 • C (+1.2%) and further increases to 500 • C, which was followed by a significant rise in volume at 750 • C (+8,3%). As the heat expansion difference of the main rock-forming minerals and phase alterations (such as α-quartz to β-quartz alteration at 573 • C) occur, significant volume increases, and thereby, cracks develop in the structure of the monzogranite samples [14,15,53,54]. The heat-induced cracks might develop at lower temperatures [24], but at elevated temperatures (750 • C) can be seen macroscopically on the surface of the specimens (Figure 8).…”

Section: Resultsmentioning

confidence: 99%

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Physical Alteration and Color Change of Granite Subjected to High Temperature

2021

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Cylindrical specimens obtained from the monzogranite host rock of the National Radioactive Waste Repository of Hungary were tested at room temperature and 250 °C, 500 °C, and 750 °C of heat treatment. Reflectance spectra (color), bulk density, Duroskop surface hardness, and ultrasound-wave velocity values were measures before and after thermal stress. According to CIE L*a*b* colorimetric characteristics, the specimens’ color became brighter and yellower after the heat treatment. At 750 °C, a significant volume increase was recorded linked to the formation of macro-cracks, and it also led to the drop in bulk density. Smaller temperature treatment (250 °C) caused a minor decrease in density (−1.3%), which is higher than the reduction of density at 500 °C (−0.8%). Duroskop surface strength showed a slight decrease until 500 °C, and then a drastic decline at 750 °C. P- and S-wave velocity values tend to decrease uniformly and significantly from room temperature to 750 °C. P-wave velocity and Duroskop values have a high exponential correlation at elevated temperatures. Physical alterations originated from the differential thermal-induced expansion of minerals, the formation of micro-cracks. Mineralogical changes at higher temperatures also contribute to the volume change and the loss in strength.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Physical Alteration and Color Change of Granite Subjected to High Temperature

2021

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“…The P-wave velocity is also used to characterize the microstructure inside the rock as a non-destructive testing method [55,56]. The V P has been employed to predict the mechanical strength to reduce the testing cost of rock mechanical properties [21].…”

Section: Relationship Between V P and Mechanical Parameters Of Granitementioning

confidence: 99%

“…Past studies have shown that there is no doubt that high-temperature treatment and rapid cooling have a thermal shock on the mechanical properties of crystalline rocks. Scholars have done extensive research on the physical, mechanical, and microstructure performances of granites exposed to thermal shock [4,5,9,10,[14][15][16][17][18][19][20][21][22][23][24]. Martyushev et al confirmed that effective pressure can alter reservoir properties [25,26].…”

Section: Introductionmentioning

confidence: 99%

“…Acoustic emission monitoring and ultrasonic velocity measurements can be used to study the influence of temperature on the microstructure of granite [43]. In addition, Zhu et al [21] also explored the relationship between the P-wave velocity and the mechanical parameters of granite that underwent different thermal shocks. Shao et al [44] investigated the fracture toughness of granite specimens after elevated temperature treatment and liquid nitrogen cooling.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Behaviors of Granite after Thermal Shock with Different Cooling Rates

et al. 2021

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During the construction of nuclear waste storage facilities, deep drilling, and geothermal energy development, high-temperature rocks are inevitably subjected to thermal shock. The physical and mechanical behaviors of granite treated with different thermal shocks were analyzed by non-destructive (P-wave velocity test) and destructive tests (uniaxial compression test and Brazil splitting test). The results show that the P-wave velocity (VP), uniaxial compressive strength (UCS), elastic modulus (E), and tensile strength (st) of specimens all decrease with the treatment temperature. Compared with air cooling, water cooling causes greater damage to the mechanical properties of granite. Thermal shock induces thermal stress inside the rock due to inhomogeneous expansion of mineral particles and further causes the initiation and propagation of microcracks which alter the mechanical behaviors of granite. Rapid cooling aggravates the damage degree of specimens. The failure pattern gradually transforms from longitudinal fracture to shear failure with temperature. In addition, there is a good fitting relationship between P-wave velocity and mechanical parameters of granite after different temperature treatments, which indicates P-wave velocity can be used to evaluate rock damage and predict rock mechanical parameters. The research results can provide guidance for high-temperature rock engineering.

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Novel Damage Quantification Techniques for Thermal-Treated Granitic Rocks

Katre,

Sirdesai

2024

Advances in Science, Technology &Amp; Innovation

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Relationships between P-wave velocity and mechanical properties of granite after exposure to different cyclic heating and water cooling treatments

Cited by 40 publications

References 45 publications

Physical Alteration and Color Change of Granite Subjected to High Temperature

Physical Alteration and Color Change of Granite Subjected to High Temperature

Mechanical Behaviors of Granite after Thermal Shock with Different Cooling Rates

Novel Damage Quantification Techniques for Thermal-Treated Granitic Rocks

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