Abstract
The microwave high-temperature irradiation was introduced to deal with the low efficiency of traditional microwave treatments for breaking granite. Structural evolution of granite between 300 °C and 800 °C was assessed through the morphology, mineral characteristics and mechanical performance. A spherical melt cavity with radial cracks formed near the biotite-rich area at 600 °C and the rock completely disintegrated at 800 °C. Intergranular crack was the main mode of micro-cracks. Besides, the micro crack propagation at 600 °C was affected by the distribution and shapes of mineral grains and original cracks. Furthermore, the intergranular crack in the biotite grain boundary induced many secondary smaller cracks. Feldspar and biotite melted at 800 °C. Thus, the melt probably initiated from the cracked-intensive feldspar near biotite-rich area. The uniaxial compressive strength of granite decreased from 88.17 MPa at 25 °C to 18.61 MPa at 800 °C. Between 300 and 600 °C, the decrease in the uniaxial compressive strength was associated with moisture releasing, quartz transition and thermal induced cracks, and 600–800 °C, the decrease was mainly contributed by the partial melt of rock, and magma intruding and solidifying.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (51574201, 21677118), the Doctor Research Foundation of Southwest University of Science and Technology (18zx7141). The authors would like to express sincere gratitude to Lanjie Hou of Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education for the help in rock mineralogical analysis.
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Zeng, J., Hu, Q., Chen, Y. et al. Experimental investigation on structural evolution of granite at high temperature induced by microwave irradiation. Miner Petrol 113, 745–754 (2019). https://doi.org/10.1007/s00710-019-00681-z
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DOI: https://doi.org/10.1007/s00710-019-00681-z