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PEER-REVIEWED ARTICLE
and elasticity, and internal bond were determined according to the relevant standards TS- EN 322 ; EN 323; EN 317; EN 310; EN 319 respectively. All physical and mechanical tests were performed in accordance with current Turkish (TS) and European standards (EN). Physical properties (water absorption, (WA 24 h to 48 h), thickness swelling (TS 24 h to 48 h) and dimensional changes (DC 24 h to 48 h)) and mechanical properties (internal bond (IB 24 h to 48 h), screw withdrawal strength (SW 24 h to 48 h), modulus of elasticity (MOE) in static bending, and modulus of rupture (MOR) in static bending) were evaluated. Static bending and dimensional change tests were carried out in parallel (//) and perpendicular ( ┴ ) directions , depending on the surface layer. When testing physical properties such as TS, DC, and WA, distilled water was used. For screw withdrawal experiments, screws of 3.5 × 40 and 4 × 40 mm dimensions were used, and the screws were applied perpendicular to the surface of the test samples. For each experiment, 10 samples with dimensions of 50 × 50 × 12 mm 3 were tested according to EN 320 (1993). Each screw was inserted into a pre-bored hole and screwed into the board through its depth. The boards were evaluated according to EN 300 (2006), which classifies and distinguishes boards into four types: 1) OSB/1 – general purpose boards and boards for interior fitments for use in dry conditions; 2) OSB/2 – load-bearing boards for use in dry conditions; 3) OSB/3 – load-bearing boards for use in humid conditions; 4) OSB/4 – heavy duty load-bearing boards for use in humid conditions. Board properties were compared to the requirements of OSB types 1, 2, 3, and 4 (EN 300 2006) and notated in this work in brackets. Data for each test were statistically analyzed. Analysis of variance (ANOVA) was used ( α < 0.05) to test for significant differences among factors of all OSB groups. The values were evaluated with the Duncan test to identify which groups were significantly different from other groups. RESULTS AND DISCUSSION Density, Moisture Content, and Dimensional Changes The average and standard deviation values of density (D), moisture content (MC), and dimensional changes (DC) of the treated OSB panels are shown in Table 1. Table 1. Average and Standard Deviation Values of Treated OSB Panels Produced by Adding WPE in Various Ratios Air-dry Dimensional changes (%) Wood (%) Polyethylene (%) Density (g/cm 3 ) // 24 h // 48 h ┴ 24 h ┴ 48 h
Moisture Cont. (%) 5.79 (0.25) 5.34 (0.27) 4.87 (0.32) 4.22 (0.29) 3.37 (0.21) 3.34 (0.19)
100
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0.620 (0.03) 0.621 (0.03) 0.624 (0.04) 0.634 (0.05) 0.655 (0.03) 0.665 (0.03)
0.59 0.43 0.35 0.37 0.31 0.17
0.8 0.7 0.6 0.5 0.5
0.98 0.64 0.32 0.23 0.24 0.12
1.2 0.9 0.6 0.5 0.4
90 80 70 60
10 20 30 40
50 0.2 Data were statistically analyzed by means of average and standard deviation, respectively. : perpendicular to major axis of panel, //: parallel to major axis of panel 50 0.32
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Yorur (2016 ). “Waste PE and effects on OSB,” B io R esources 11(1), 2483-2491.
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