Abstract
High temperature thermal treatment to clay mineral often leads to the development of new micro-cracks or extension/widening of pre-existing micro-cracks, which naturally would result in the variation of physical properties. Experiments aiming to understand the evolution of physical properties of clay have been carried out from 20 to 800 °C in a heating furnace, and the results were summarized as follows: two temperature ranges (20–200 °C and 300–500 °C) corresponding to the vaporization of moisture (i.e. adhered water or bound water) and oxidation/decomposition reactions of organic matters are obviously evident; clay specimens seem to exhibit the most pronounced physical property changes within the temperature range of 300–500 °C, which presumably is attributed to the transition of structural water, organic carbon and kaolin of clay. Moreover, within the temperature range of 400–600 °C, especially between 500 and 600 °C, kaolin structure of clay appears to undergo pronounced chemical changes, ultimately affording increased material porosity accompanied by altered wave velocity.
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This research was supported by the Fundamental Research Funds for the Central Universities (2014ZDPY27) and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Sun, Q., Zhang, W. & Qian, H. Effects of high temperature thermal treatment on the physical properties of clay. Environ Earth Sci 75, 610 (2016). https://doi.org/10.1007/s12665-016-5402-2
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DOI: https://doi.org/10.1007/s12665-016-5402-2