The thermal damaging process of diorite under microwave irradiation

Laboratory tests have been conducted to investigate the effects of thermal damage on diorite under microwave irradiation. The sample rocks were heated to high temperature range of 300 to 800 ℃ in a single-mode microwave furnace. The experimental results show that the rocks started to crack at 500 ℃...

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Published inFrattura ed integritá strutturale Vol. 13; no. 47; pp. 65 - 73
Main Authors Lu, Xirui, Yuan, Chen, Junsen, Zeng, Qijun, Hu, Dadong, Shao, Haibin, Zhang, Xirui, Lu
Format Journal Article
LanguageEnglish
Published Cassino Gruppo Italiano Frattura 01.01.2019
Subjects
Compressive strength
Diffraction
Diorite
Disintegration
Evaporation
Fracture mechanics
High temperature
Irradiation
Laboratory tests
Microwave heating
Microwave radiation
Phase transitions
Quartz
Radiation damage
Rock breakage
Rocks
Temperature effects
Thermal damage
Thermal expansion
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Summary:Laboratory tests have been conducted to investigate the effects of thermal damage on diorite under microwave irradiation. The sample rocks were heated to high temperature range of 300 to 800 ℃ in a single-mode microwave furnace. The experimental results show that the rocks started to crack at 500 ℃ and completely disintegrated at 700 ℃. The intensities of quartz diffraction peaks were almost unchanged while the diffraction peak intensity of hornblende gradually decreased with temperature increasing. In addition, the chlorite diffraction peak disappeared at 500 ℃. The compressive strength of the sample decreased to 40% at 600 ℃ and it approached zero at 700 ℃. In this paper, the possible reasons for the thermal effects on the fracture of diorite were discussed, which can be related to water evaporation, thermal cracks and mismatch thermal expansion, and phase transition on quartz. The result indicates that diorite can be effectively destroyed under microwave irradiation.
ISSN:1971-8993
1971-8993
DOI:10.3221/IGF-ESIS.47.06