Abstract
The structure of xylite as lithotype of lignite indicates that it predominately originates from tree stems, from the family Taxodiaceae or Cupressaceae. Despite drastic changes in the long term process of its transformation, it retains some relevant properties of wood, nowadays applicable for specific products. The research examined the influence of moisture content and temperature on modulus of elasticity (MOE) and modulus of rupture (MOR) as well as shear strength and hardness. With decreasing of moisture content, the bending strength and stiffness of xylite increased and was best fitted by power regression model. The increasing of testing temperature from 20 °C to 80 °C had negative effect on stiffness and bending strength of xylite. The hardness was positively correlated with density of xylite, whereas shear strength had the opposite tendency.
Highlights
The structure of xylite as lithotype of lignite indicates that it predominately originates from tree stems, from the family Taxodiaceae or Cupressaceae
The research examined the influence of moisture content and temperature on modulus of elasticity (MOE) and modulus of rupture (MOR) as well as shear strength and hardness
The hardness was positively correlated with density of xylite, whereas shear strength had the opposite tendency
Summary
Xyilite is a lithotype of lignite, known as xyloid lignite or fossil wood, mined in various parts of Europe, United States, India and Australia. Due to collapse of cell walls into lumina, the density of xylite is high (the oven dry density of xylite was 1216 kg/m3, whereas the basic density was only 873 kg/m3, due to large volumetric shrinkage) but the capillary structure and hygroscopic characteristic of wood are preserved (Gorišek et al, 2012). The appearance of xylite resembles that of precious wood species with dark heartwood and when it does not contain great amounts of mineral inclusions, it can be processed with wood working machines. When polished, it often shows recognizable structure of wood and its color looks like wood species with dark colored heartwood, such as wenge (Milletialaurentii) or ebony (Dyospiros sp.). Due to its high sorption capacity, the influence of temperature and moisture content on examined mechanical properties of xylite is studied
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