Characterization of Microschist Rocks under High Temperature at Najran Area of Saudi Arabia

Haitham M. Ahmed, Hussin A. M. Ahmed and Sefiu O. Adewuyi
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Haitham M. Ahmed: Mining Engineering Department, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Hussin A. M. Ahmed: Mining Engineering Department, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Sefiu O. Adewuyi: Mining Engineering Department, King Abdulaziz University, Jeddah 21589, Saudi Arabia

Energies, 2021, vol. 14, issue 22, 1-20

Abstract: Rocks’ physical, mechanical, and mineralogical properties are essential in the design process of underground applications. To understand changes in these rocks’ properties at high temperatures, numerous studies have been conducted on several rock types, with little being known about microschist rock. This paper presents experimental study on the physical (e.g., density and P-wave velocity), mechanical (uniaxial compressive strength (UCS)), and microstructural behavior of microschist rock at room temperature (22 °C) and at high temperatures, i.e., 400, 600, and 800 °C. The results indicated that as the temperature increases, the microschist’s color changed, and dry density decreased by 0.97% at 800 °C. Additionally, the average P-wave velocity of microschist decreased by 4.14, 7.07, and 34.23%, at 400, 600, and 800 °C, respectively. Similarly, at these temperatures, the UCS of the microschist decreased by 34.4, 56.9, and 80.1%, respectively. Further findings from microscopic studies reveal that the observed changes in physical and mechanical properties were due to the structural deformation of the microschist at high temperatures.

Keywords: heating; microschist; P-wave; uniaxial compressive strength; microstructure (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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