DEVELOPMENT OF GLUE LAMINATED BAMBOO AND BAMBOO-WOOD COMBINATION FOR STRUCTURAL USES

摘要

Two bamboo species, namely: kauayan tinik (Bambusa blumeana S.A. & J.H. Schultes) and botong [Dendrocalamus latiflorus (Munro) Kurz] and one timber species, yemane (Gmelina arborea Roxb.), were used to produce laminated bamboo and bamboo-wood. The samples were laminated using urea formaldehyde (UF) + ammonium chloride (NH_4Cl) as Glue Ⅰ, and UF + NH_4Cl + isocyanate as Glue Ⅱ. The effects of species, glue type and type of laminates (either bamboo-bamboo or bamboo-wood) were evaluated based on dry and wet shear tests. Strength properties in bending, compression parallel to the grain and shear along glue line of laminated bamboo and composite bamboo-wood lamination were also determined. These were found to be comparable to those of traditional timber species used for general structural purposes such as beams, girders, flooring, etc. In the strength classification of wood devised at FPRDI, laminated bamboo was comparable to commercial timber species under Class 2 (moderately high strength) such as kamagong (Diospyros discolor Willd), molave (Vitex parviflora Juss) and narra (Pterocarpus indicus Willd. forma indicus), while the composite bamboo-wood lamination fell under Class 3 (medium strength) to which Philippine Mahogany Species such as white lauan (Shorea contorta Vidal), red lauan (Shorea negrosensis Foxw.), bagtikan [Parashorea malaanonan (Blanco) Merr.] and tangile [Shoreapolysperma (Blanco) Merr.] belong.