Changes of physical properties of Silesian granite due to heat loading

0481699 - ÚGN 2018 RIV NL eng C - Conference Paper (international conference)
Kožušníková, Alena - Konečný, Pavel - Plevová, Eva - Králová, Lucie
Changes of physical properties of Silesian granite due to heat loading.
Procedia Engineering - ISRM European Rock Mechanics Symposium EUROCK 2017. Amsterdam: Elsevier Ltd., 2017 - (Koníček, P.; Souček, K.; Konečný, P.), s. 426-433. 191. ISSN 1877-7058.
[ISRM European Rock Mechanics Symposium EUROCK 2017. Ostrava (CZ), 20.06.2017-23.06.2017]
R&D Projects: GA MŠMT ED2.1.00/03.0082; GA MŠMT(CZ) LO1406
Institutional support: RVO:68145535
Keywords : granite * temperature * physical properties
OECD category: Environmental and geological engineering, geotechnics
http://www.sciencedirect.com/science/article/pii/S1877705817323408

Temperature affects both the physical and structural properties of rocks and there may even cause chemical changes of minerals. Rocks are more or less inhomogeneous material, so that during testing the same rock samples taken from one location the measured values of physical properties can vary on large scattering between test specimens. To eliminate the influence of inhomogeneity of rock, we analyzed the effect of heat loading (up to 700˚ C) on the same specimens. For this reason we have used in our research particularly non-destructive testing methods – determination of bulk density, measuring of longitudinal ultrasonic wave propagation velocity, thermal conductivity and volumetric heat capacity. Besides the physical characteristics determined in the same specimen before and after tempering gas permeability and thermal expansion untempered and tempered test specimens was determined. Hg porosity and total porosity of untempered and tempered specimens were found, too. As model material was chosen so-called Silesian granite from Nový lom quarry (Žulová pluton, Czech Republic), which has been previously tested, and over macroscopically homogeneous character the variances in the measured parameters were found. Hg and total porosity and gas permeability increase with increasing temperature. The bulk density, the ultrasonic wave propagation velocity and thermal conductivity decrease with increasing temperature. The most sensitive parameters are ultrasonic wave velocity, thermal conductivity and permeability.
Permanent Link: http://hdl.handle.net/11104/0277212