Microstructures and Physical Properties Characterisation of Rocks Using Multi-Analytical Techniques

Abstract

This study aims to characterise the effect of wet-dry cycles on microstructures and physical properties of rocks. Utilising techniques like Scanning Electron Microscopy, Electron Probe Microanalysis, petrographic analysis, changes in microstructure have been thoroughly observed. Rocks were subjected to controlled wet-dry cycles, stimulating long-term weathering to resemble the natural environmental conditions. Results from porosity analysis revealed a direct relationship to weathering of rock. Correlating the results from clay content determination through X-Ray Diffraction Analysis analysis showed that rocks comprising higher clay weather quickly when they come into contact with water. Microstructural analysis demonstrated the intensification of microcracks and micropores, along with the discolouration of minerals. Correlating the results from both mineralogical and microstructural analysis, significant effects of the wet-dry cycle have been identified that clearly show the degradation of rock integrity with repetitive moisture fluctuations. This combined approach highlights the impacts of seasonal variations in microstructural and mineralogical parameters emphasising the necessity to incorporate the parameters in slope stability assessments.