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An Influence of Thermally-Induced Micro-Cracking under Cooling Treatments: Mechanical Characteristics of Australian Granite

Author

Listed:
  • Badulla Liyanage Avanthi Isaka

    (Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC 3800, Australia)

  • Ranjith Pathegama Gamage

    (Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC 3800, Australia)

  • Tharaka Dilanka Rathnaweera

    (Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC 3800, Australia)

  • Mandadige Samintha Anne Perera

    (Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC 3800, Australia
    Department of Infrastructure Engineering, The University of Melbourne, Building 176, Melbourne, VIC 3010, Australia)

  • Dornadula Chandrasekharam

    (Indian Institute of Technology Hyderabad, Telangana 502285, India)

  • Wanniarachchige Gnamani Pabasara Kumari

    (Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC 3800, Australia)

Abstract

The aim of this study is to characterise the changes in mechanical properties and to provide a comprehensive micro-structural analysis of Harcourt granite over different pre-heating temperatures under two cooling treatments (1) rapid and (2) slow cooling. A series of uniaxial compression tests was conducted to evaluate the mechanical properties of granite specimens subjected to pre-heating to temperatures ranging from 25–1000 °C under both cooling conditions. An acoustic emission (AE) system was incorporated to identify the fracture propagation stress thresholds. Furthermore, the effect of loading and unloading behaviour on the elastic properties of Harcourt granite was evaluated at two locations prior to failure: (1) crack initiation and (2) crack damage. Scanning electron microscopy (SEM) analyses were conducted on heat-treated thin rock slices to observe the crack/fracture patterns and to quantify the extent of micro-cracking during intense heating followed by cooling. The results revealed that the thermal field induced in the Harcourt granite pore structure during heating up to 100 °C followed by cooling causes cracks to close, resulting in increased mechanical characteristics, in particular, material stiffness and strength. Thereafter, a decline in mechanical properties occurs with the increase of pre-heating temperatures from 100 °C to 800 °C. However, the thermal deterioration under rapid cooling is much higher than that under slow cooling, because rapid cooling appears to produce a significant amount of micro-cracking due to the irreversible thermal shock induced. Multiple stages of loading and unloading prior to failure degrade the elastic properties of Harcourt granite due to the damage accumulated through the coalescence of micro-cracks induced during compression loading. However, this degradation is insignificant for pre-heating temperatures over 400 °C, since the specimens are already damaged due to excessive thermal deterioration. Moreover, unloading after crack initiation tends to cause insignificant irreversible strains, whereas significant permanent strains occur during unloading after crack damage, and this appears to increase with the increase of pre-heating temperature over 400 °C.

Suggested Citation

  • Badulla Liyanage Avanthi Isaka & Ranjith Pathegama Gamage & Tharaka Dilanka Rathnaweera & Mandadige Samintha Anne Perera & Dornadula Chandrasekharam & Wanniarachchige Gnamani Pabasara Kumari, 2018. "An Influence of Thermally-Induced Micro-Cracking under Cooling Treatments: Mechanical Characteristics of Australian Granite," Energies, MDPI, vol. 11(6), pages 1-24, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1338-:d:148870
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    References listed on IDEAS

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    1. Feng, Zijun & Zhao, Yangsheng & Zhou, Anchao & Zhang, Ning, 2012. "Development program of hot dry rock geothermal resource in the Yangbajing Basin of China," Renewable Energy, Elsevier, vol. 39(1), pages 490-495.
    2. Zhao, Yangsheng & Feng, Zijun & Feng, Zengchao & Yang, Dong & Liang, Weiguo, 2015. "THM (Thermo-hydro-mechanical) coupled mathematical model of fractured media and numerical simulation of a 3D enhanced geothermal system at 573 K and buried depth 6000–7000 M," Energy, Elsevier, vol. 82(C), pages 193-205.
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    Cited by:

    1. Zhu, Zhennan & Ranjith, Pathegama Gamage & Tian, Hong & Jiang, Guosheng & Dou, Bin & Mei, Gang, 2021. "Relationships between P-wave velocity and mechanical properties of granite after exposure to different cyclic heating and water cooling treatments," Renewable Energy, Elsevier, vol. 168(C), pages 375-392.
    2. Yan-Jun Shen & Xin Hou & Jiang-Qiang Yuan & Chun-Hu Zhao, 2019. "Experimental Study on Temperature Change and Crack Expansion of High Temperature Granite under Different Cooling Shock Treatments," Energies, MDPI, vol. 12(11), pages 1-17, May.
    3. Xiangchao Shi & Leiyu Gao & Jie Wu & Cheng Zhu & Shuai Chen & Xiao Zhuo, 2020. "Effects of Cyclic Heating and Water Cooling on the Physical Characteristics of Granite," Energies, MDPI, vol. 13(9), pages 1-18, April.
    4. Peng Xiao & Jun Zheng & Bin Dou & Hong Tian & Guodong Cui & Muhammad Kashif, 2021. "Mechanical Behaviors of Granite after Thermal Shock with Different Cooling Rates," Energies, MDPI, vol. 14(13), pages 1-17, June.
    5. Isaka, B.L. Avanthi & Ranjith, P.G. & Rathnaweera, T.D. & Perera, M.S.A. & Kumari, W.G.P., 2019. "Influence of long-term operation of supercritical carbon dioxide based enhanced geothermal system on mineralogical and microstructurally-induced mechanical alteration of surrounding rock mass," Renewable Energy, Elsevier, vol. 136(C), pages 428-441.
    6. Chandrasekharam, Dornadula & Baba, Alper & Ayzit, Tolga & Singh, Hemant K., 2022. "Geothermal potential of granites: Case study- Kaymaz and Sivrihisar (Eskisehir region) Western Anatolia," Renewable Energy, Elsevier, vol. 196(C), pages 870-882.
    7. Mohamed Elgharib Gomah & Guichen Li & Changlun Sun & Jiahui Xu & Sen Yang & Jinghua Li, 2022. "On the Physical and Mechanical Responses of Egyptian Granodiorite after High-Temperature Treatments," Sustainability, MDPI, vol. 14(8), pages 1-22, April.

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