The ultimate objective of this thesis report was to develop a new type of lumber-like wood products made of OSB sheets, i.e. laminated OSB (LOSB). The specific objective of this thesis report was to investigate the optimized surface treatment parameters on the bond quality of LOSB, including sanding and grooving. This project used 6 surface treatment methods and 2 adhesives [phenol formaldehyde (PF) and isocyanate] to fabricate 2-layer LOSB specimens by considering 2 panel directions (major and minor). 3 types of tests were conducted, center-point short-span bending test, block shear test and percentage wood failure (PWF). A total of 768 specimens were fabricated. It was found that: (1) The best bond quality of LOSB specimens was, in terms of horizontal shear strength, block shear strength and PWF, obtained at combined surface treatment, i.e. sanding and tooth-plate indenting, which was bonded using PF. (2) The specimens had a 10-30% and 5-40% higher bond horizontal shear strength and block shear strength in the major direction than in the minor direction, respectively. (3) The average horizontal shear strength and block shear strength of the specimens from the central positions were about 4-8% and 3-10% larger than those from the edges, respectively. (4) The surface treatment, panel direction, and adhesive type had a statistically significant impact on the horizontal shear strength and block shear strength at a 95% confidence level. (5) The average values tested for horizontal shear strength and block shear strength were 2.25MPa and 4.4MPa, respectively. (6) The combination of sanding and tooth-plate indenting could be a good surface treatment to increase the bond strength. Key words: OSB, Laminated OSB, bond quality, block shear strength, horizontal shear strength, percentage wood failure, surface treatment, sanding, tooth-plate indenting.
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