Variation of mechanical properties of granite after high-temperature treatment |
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| Authors: | Jianjun Hu Qiang Sun Xiaohua Pan |
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| Institution: | 1.School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,People’s Republic of China;2.School of Civil and Environmental Engineering,Nanyang Technological University,Singapore,Singapore |
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| Abstract: | Variations in the mechanical properties (compressive strength, elastic modulus, tensile strength, and fracture toughness) of granite were analyzed as functions of temperature. It was found that above 200 °C, tensile strength and fracture toughness tended to decrease with temperature, while variations in the compressive strength and elastic modulus demonstrated decreasing trends when the heating temperature exceeded 400 °C. The temperature ranges of room temperature—200 and above 600 °C—corresponded to an undamaged state and strongly/completely damaged state, respectively. It is suggested that 400 °C might be a critical threshold of thermal damage to granite. Based on results of statistical tests, a sharp decrease in mechanical properties can be recognized, accompanied by a drastic growth in peaking strain and acoustic emission rate. This phenomenon may be associated with the α/β phase transition of quartz. |
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