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Influence of high temperatures on physical properties and microstructure of gneiss

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Abstract

A systematic study with regard to the effects of heat treatment on the physical properties and microstructure of mylonitic gneiss was conducted. The analysis temperatures were 400 °C, 750 °C and 1100 °C, except for the control group, which was kiln-dried at 100 °C. The physical properties associated with uniaxial compression, wave propagation, mercury porosimetry and dilatometric measurements were determined using standard methods. A 60% decrease in compressive strength and 90% decay in wave propagation after heat treatment were observed. The thermal expansion of different mineral phases contributed to the appearance of microcracks. Higher heat treatment temperatures promoted increased mercury intrusion, which was related to an increase of 8.2% in apparent porosity, and the formation of new pores with diameters ranging from 0.2 to 4 μm. When compressed perpendicularly to the foliation, the strength of the specimens gradually increased at −400 °C, whereas it peaked at −750 °C for compression parallel to foliation.

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Funding

This study was partly financed by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brazil) Finance Code 001. FAPERJ (E-26/203.243/2016) provided additional financial support.

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Correspondence to A. R. G. Azevedo.

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The authors declare no competing interests.

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Costa, K.O.B., Xavier, G.C., Marvila, M.T. et al. Influence of high temperatures on physical properties and microstructure of gneiss. Bull Eng Geol Environ 80, 7069–7081 (2021). https://doi.org/10.1007/s10064-021-02362-8

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  • DOI: https://doi.org/10.1007/s10064-021-02362-8

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