Microstructural evolution of granitic stones exposed to different thermal regimes analysed by infrared thermography.
نویسندگان
چکیده
Detailed knowledge of the behaviour rocks under thermal stress is essential in a variety fields such as exploitation oil and mineral resources, geothermal sector, storage radioactive liquid waste, or even CO2 capture storage. Granites are widely studied exploited these fields, they show different reactions to high-temperature cycles due mainly their high mineralogical textural heterogeneity. One features that influences most response porosity. The objective this study evaluate influence porosity when exposed treatments. For purpose, experiments were carried out on four granitoids selected by similar crystal size, but with variable proportion values, ranging from 1 6%. Two kinds tests performed: i) progressive heating 90 °C 130 determine critical threshold for damage; ii) fatigue heating-cooling up 200 °C. water transport phenomena samples characterised before after each cycle monitoring capillary uptake coupled infrared thermography. This technique allowed follow fringe migration during test evolution cooling rate index. direct assessment damage was mercury injection porosimetry, optical polarising microscopy, scanning electron microscopy. combination all results permitted establish link between temperature modification porous networks granitoids. Microcracks appeared distinctly at whose Quartz/Feldspar ratio close 1. higher temperatures, low develop microcracks first cycle. then showed stronger impact than effect mineralogy. obtained thermography detect strong variations microstructure.
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ژورنال
عنوان ژورنال: Engineering Geology
سال: 2021
ISSN: ['1872-6917', '0013-7952']
DOI: https://doi.org/10.1016/j.enggeo.2021.106057