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THE EFFECTS OF TANNIN AND THERMAL TREATMENT ON PHYSICAL AND MECHANICAL PROPERTIES OF LAMINATED CHESTNUT WOOD COMPOSITES
The aim of this study was to investigate the effects of tannin and
thermal treatment on physical properties such as dimensional stability
and moisture content (\%), as well as mechanical properties such as
bending strength, modulus of elasticity, and compression strength of
laminated chestnut wood composites, which are used commonly for
shipboard construction in Turkey. The chestnut wood used in boat
construction is usually exposed to several treatments in order to
achieve better bonding performance and to remove excessive tannins.
According to the results obtained, physical properties of laminated
chestnut wood without tannin were better compared to samples with
tannin. Oven-dry density and air-dry density were found to be higher in
samples containing tannins and not exposed to thermal treatment.
Moreover, the lowest value of density was observed in samples containing
no tannin and exposed to thermal treatment. In terms of mechanical
properties, the highest bending strength and modulus of elasticity were
obtained from samples containing tannins and not exposed to heat
treatment. The lowest values were found in samples without tannin
exposed to heat treatment. Regarding compression strength, the maximum
and minimum values were found in samples containing tannins and not
exposed to heat treatment and samples without tannin and exposed to heat
treatment, respectively