Abstract
In this study, the engineering behaviors of rocks exposed to temperatures ranging from 200 to 1000 °C were investigated and changes in the geomechanical properties, as well as related mineralogical changes, were examined. To reduce the effect of rapid heating and prevent the formation of new thermo-mechanical cracks, a heating rate of 10 °C/min was used. In addition, a heating time of 2 h was applied for each temperature degree to observe the thermal heating effect. After heating, the samples were left to cool to room temperature, both dry or immersed in water. The strength of the samples gradually decreased from 128 to 25 MPa with increasing temperature. The strength value decreases by about 70% for the samples cooled in air and by about 80% when cooled in water. The strength decrease was greater for the water-cooled samples because of new microcracks and glass material formed during sudden cooling. The effect of different temperature degrees on rock samples was evaluated separately and approximately 80% of total strength decrease occurred in the 600–700 °C range. Also, new mineral formation and melting of the existent minerals were not observed, although the structural properties were significantly changed at these temperatures. At 800 °C and above, some secondary minerals (e.g., melilite and augite) were formed. Partial melting was seen at temperatures higher than 1000 °C. In the study, a predictive model as a function of the strength for determination of thermal damage on rocks was also suggested. Some equations characterized by a correlation coefficient of 96% were suggested, based on the curves of thermal damage, to predict the uniaxial compressive strength for the designed temperature.
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Acknowledgements
This research was partly funded by the Karadeniz Technical University Scientific Research Projects Unit (Project ID: 6326-1226 and 6211-716). The authors would like to thank the reviewers for their constructive contributions.
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Ersoy, H., Kolaylı, H., Karahan, M. et al. Effect of thermal damage on mineralogical and strength properties of basic volcanic rocks exposed to high temperatures. Bull Eng Geol Environ 78, 1515–1525 (2019). https://doi.org/10.1007/s10064-017-1208-z
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DOI: https://doi.org/10.1007/s10064-017-1208-z