Selected Properties of Heat-Treated Eastern Red Cedar (Juniperus virginiana L.) Wood

Abstract

The objective of this study was to evaluate the effect of heat treatment on properties including oven-dry density, weight loss, surface roughness, shear strength, and hardness of eastern red cedar (Juniperus virginiana L.). The anatomical structures of samples were also examined by scanning electron microscope (SEM). Two different heat treatment schedules, with temperatures of 130°C and 160°C and 3 and 7 h exposure times, were considered for the experiment. A stylus method was employed to evaluate the surface properties of heat-treated samples. Three roughness parameters, average roughness (R a ), mean peak-to-valley height (R z ), and maximum roughness (R max ), were determined from the surface of specimens and used to evaluate the effect of heat treatment on the surface properties. The shear strength of samples bonded with polyvinyl acetate (PVAc) adhesive was also measured. All properties of the samples exposed to different heat treatment schedules were significantly different (p = 0.05) from each other. The results of this study demonstrated that the oven-dry density, surface roughness, shear strength, and hardness of the samples decreased, while their weight loss increased slightly, with increasing heat treatment temperature and time.

Effects of Heat Treatment on Physical-Mechanical Properties of Eucalyptus regnans

“…However, it is well known that overly high temperatures may reduce the mechanical strength of wood based on the finding in previous studies (Korkut et al 2008(Korkut et al , 2013Kesik et al 2014;Pavel et al 2014). For example, Pavel et al (2014) determined a significant decrease of 47% in value of shear strength for thermally treated wood with natural wood when compared with natural oak -oak bonding.…”

Effects of heat treatment on the behavior of teak wood adherends bonded joints

“…There are different processes by which the hygroscopicity of wood can be reduced and many studies have been carried out in the literature on different processes [5,6].Heat treatment is the oldest and simplest method by which wood hygroscopicity can be effectively decreased. In addition, the dimensional stability, biological resistance and durability of the wood can also be improved [7][8][9]. It was showed that the heat treatment of wood not only reduced the hygroscopicity but also caused physical changes in the wood such as surface modification, which can significantly affect the adhesive bond…”