Thermal expansion behaviour of granites

Abstract

This paper presents the application of thermomechanical analysis along with thermogravimetric analysis and differential thermal analysis in characterization of thermal expansion behaviour of three granite samples from Czech Republic and two granite samples from India and Italy. The mineralogical composition was carried out by optical microscopy, X-ray diffraction and FTIR spectroscopy. The detailed study has included mainly the effect of granite composition and structure on final thermal expansion and effect of proceeding phase transformation during heat stress of material. The coefficient of thermal expansion showed relatively similar values for all studied granite samples ranged from 35 to 43.10−6 K−1. TMA curves displayed a bit different shapes and characteristics; the final shape probably depends both on the content of quartz and feldspar and on their proportion of the mixture.