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Investigating the textural and physico-mechanical response of granites to heat treatment
International Journal of Rock Mechanics and Mining Sciences ( IF 7.2 ) Pub Date : 2022-11-23 , DOI: 10.1016/j.ijrmms.2022.105281
Hamza Khan, Muhammad Sajid

This study investigates the petrographic changes associated with heat treatment of texturally variant granites from northwest Pakistan. The corresponding effects on the physico-mechanical properties have also been analyzed. Detailed microscopic observations distinguish collected rocks into (i) Alkali feldspar micro-porphyritic variety of Ambela granite (AFG) (ii) coarse grained Malakand granite (MG) (iii) mega-porphyritic Utla granite (UG). The non-destructive tests including ultrasonic pulse velocity, Schmidt rebound hardness, porosity, specific gravity and water absorption of studied granites are markedly influenced by temperature variation. Particularly at temperature ≥600 ⁰С, a drastic decreasing trend observed with temperature rise. Significant instability in minerals has been noted with increasing temperature shown by the initiation of thermally induced fractures and widening of pre-existing cracks. Pre-existing fractures in major minerals including feldspars and quartz expand with increasing temperature accompanied by the novel fractures induced due to high thermal stresses that also effects the physical and mechanical properties. The relatively more altered UG is more prone to textural changes associated with heat treatment and the effects can be seen at lower temperatures than other studied fresh granites.



中文翻译:

研究花岗岩对热处理的结构和物理机械反应

本研究调查了与来自巴基斯坦西北部的结构变异花岗岩的热处理相关的岩相变化。还分析了对物理机械性能的相应影响。详细的显微观察将收集的岩石区分为 (i) 安贝拉花岗岩 (AFG) 的碱长石微斑状变体 (ii) 粗粒马拉坎德花岗岩 (MG) (iii) 巨斑状 Utla 花岗岩 (UG)。所研究花岗岩的超声脉冲速度、施密特回弹硬度、孔隙率、比重和吸水率等无损检测受温度变化的显着影响。特别是在温度≥600⁰С时,随着温度的升高观察到急剧下降的趋势。随着温度的升高,热诱发裂缝的开始和预先存在的裂缝的扩大表明了矿物的显着不稳定性。包括长石和石英在内的主要矿物中预先存在的裂缝随着温度的升高而扩展,同时由于高热应力引起的新裂缝也会影响物理和机械性能。相对改变较多的 UG 更容易发生与热处理相关的结构变化,并且与其他研究的新鲜花岗岩相比,在较低的温度下可以看到这种效果。包括长石和石英在内的主要矿物中预先存在的裂缝随着温度的升高而扩展,同时由于高热应力引起的新裂缝也会影响物理和机械性能。相对改变较多的 UG 更容易发生与热处理相关的结构变化,并且与其他研究的新鲜花岗岩相比,在较低的温度下可以看到这种影响。包括长石和石英在内的主要矿物中预先存在的裂缝随着温度的升高而扩展,同时由于高热应力引起的新裂缝也会影响物理和机械性能。相对改变较多的 UG 更容易发生与热处理相关的结构变化,并且与其他研究的新鲜花岗岩相比,在较低的温度下可以看到这种影响。

更新日期:2022-11-23
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