An investigation of thermal effects on micro-properties of granite by X-ray CT technique

By L. Fan, J. W. Gao, Zhijun Wu, S. Yang, Guowei Ma. Applied Thermal Engineering, 2018

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Abstract The thermal effects on micro-properties of granite were experimentally studied. The volumetric porosity was observed by the X-ray Computed Tomography (CT) technique and three-dimensional (3D) image reconstruction. Two indexes (heterogeneity coefficient and anisotropy coefficient) were proposed to describe the micro-properties of granite. The thermal effects on these two indexes were discussed. The results shows that micro-porosity increases as temperature increases between 400 °C and 800 °C. It is slightly influenced by temperature beyond this range. Both of the heterogeneity and anisotropy of thermal treated granite increase to their maximums as temperature increases to 500 °C, than decrease to constants as temperature further increases. The heterogeneity and anisotropy of granite are mainly dominated by the initial cracks below 200 °C. The thermal induced cracks are mainly in the regions of lower density mineral grains below 400 °C. Boundary cracks and trans-granular cracks generate significantly above 500 °C.

Subfields: Geophysics, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/887d04ae87b162c63891079797df77ebf2d9c67b