Experimental Investigation on the Damage Evolution of Thermally Treated Granodiorite Subjected to Rapid Cooling with Liquid Nitrogen
Mohamed Elgharib Gomah,
Enyuan Wang () and
Ahmed A. Omar
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Mohamed Elgharib Gomah: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Enyuan Wang: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Ahmed A. Omar: Housing and Building National Research Center, Cairo 11511, Egypt
Sustainability, 2024, vol. 16, issue 15, 1-23
Abstract:
In many thermal geotechnical applications, liquid nitrogen (LN 2 ) utilization leads to damage and cracks in the host rock. This phenomenon and associated microcracking are a hot topic that must be thoroughly researched. A series of physical and mechanical experiments were conducted on Egyptian granodiorite samples to investigate the effects of liquid nitrogen cooling on the preheated rock. Before quenching in LN 2 , the granodiorite was gradually heated to 600 °C for two hours. Microscopical evolution was linked to macroscopic properties like porosity, mass, volume, density, P-wave velocity, uniaxial compressive strength, and elastic modulus. According to the experiment results, the thermal damage, crack density, porosity, and density reduction ratio increased gradually to 300 °C before severely degrading beyond this temperature. The uniaxial compressive strength declined marginally to 200 °C, then increased to 300 °C before monotonically decreasing as the temperature rose. On the other hand, at 200 °C, the elastic modulus and P-wave velocity started to decline significantly. Thus, 200 and 300 °C were noted in this study as two mutation temperatures in the evolution of granodiorite mechanical and physical properties, after which all parameters deteriorated. Moreover, LN 2 cooling causes more remarkable physical and mechanical modifications at the same target temperature than air cooling. Through a deeper comprehension of how rocks behave in high-temperature conditions, this research seeks to avoid and limit future geological risks while promoting sustainability and understanding the processes underlying rock failure.
Keywords: Egyptian granodiorite; liquid nitrogen; physical and mechanical properties; microscopical evolution; cooling impacts (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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