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Thermal Effects on Microcracking and Physical Characteristics of Khoramdareh, Natanz, Nehbandan, and Taibad Granites | ||
| Geopersia | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 17 شهریور 1404 | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/geope.2025.390516.648809 | ||
| نویسندگان | ||
| Saeed Nejati؛ Mashalah Khamehchiyan* ؛ Mohammad Reza Nikudel | ||
| Engineering Group, Faculty of Basic Sciences, Tarbiat Modares University | ||
| چکیده | ||
| This study explores the thermal behavior of four widely used Iranian granites - Khoramdareh, Nehbandan, Natanz, and Taibad - under temperatures ranging from 20°C to 1050°C. The investigation focused on the evolution of microcracks and their impact on key physical properties such as porosity, water absorption, and P-wave velocity in both dry and saturated conditions. At 300°C, all granite samples showed an increase in inter-crystalline microcracks, leading to elevated porosity and water absorption. At 600°C, the quartz phase transition at 573°C resulted in volumetric expansion, causing a temporary decrease in porosity and an increase in P wave velocity. For example, the dry P wave velocities at 600°C were 4.77 km/s for Taibad, 4.71 km/s for Khoramdareh, 3.84 km/s for Natanz, and 5.12 km/s for Nehbandan. Above 750°C, trans-crystalline microcracks became dominant, significantly increasing porosity and water absorption while reducing P wave velocity. Nehbandan granite suffered structural failure at 600°C, whereas Natanz exhibited the highest LMD at 750°C, indicating severe internal damage. The study highlights the importance of microcracks evolution and mineralogical transformations, particularly quartz phase transitions, in controlling granite's thermal stability. Three critical thresholds (300°C, 600°C, and 750°C) were identified as turning points in the deterioration process. Additionally, this research introduces a novel methodological approach, combining fluorescence microscopy with physical testing to achieve detailed characterization of thermal damage. | ||
| کلیدواژه‌ها | ||
| Iranian granite؛ thermal expansion؛ P-wave velocity؛ microcrack analysis؛ fluorescence thin section | ||
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آمار تعداد مشاهده مقاله: 39 |
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