Abstract
ABSTRACT The glued laminated timber (glulam) is a composite material obtained from the bonding of wood laminae arranged with parallel fibers put together. The purpose of this paper was to evaluate the influence of the number of laminae on the mechanical behavior of glulam of Toona ciliata produced with vegetable-based polyurethane adhesive. The glulam beams were produced with lamellae in the dimensions of 6.0 x 1.5 x 120.0 cm, with 3 beams being made per treatment, which were structurally composed by 5, 7 and 9 laminae. The polyurethane adhesive based on castor oil was used, applying a grammage of 350 g m-². For the technological characterization of the wood the moisture in the dry base, bulk density, chemical characterization, compressive strength parallel to the fibers, shear and modulus of elasticity (MOE) and rupture (MOR) in the static bending test. While the properties of modulus of elasticity (MOE), modulus of rupture (MOR), shear strength, delamination and visualization of the glue line through photomicrographs of the laminated wood samples were determined for glulam beams. The results showed that the beams with 5 laminae presented values similar to solid wood. The increase in the number of laminae provided lower values for stiffness and strength of the beams. The photomicrographs showed the quality of the bonding and the satisfactory values for shear strength and delamination, indicating the viability of the species under study for situations with high moisture content.
Highlights
Glued laminated timber (Glulam) is an engineering product consisting of laminae juxtaposed in a straight or curved manner, with the grain of all parts essentially parallel to the longitudinal axis of the element (Stark; Cai; Carll, 2010)
It is important to know the behavior of the wood beams in the conditions that will be used, and for this, tests based on the modulus of elasticity (MOE) and modulus of rupture (MOR) are required (Issa; Kmeid, 2005)
The results showed a significant reduction of the MOE and MOR values of the glulam beams with the increase of the number of laminae
Summary
Glued laminated timber (Glulam) is an engineering product consisting of laminae juxtaposed in a straight or curved manner, with the grain of all parts essentially parallel to the longitudinal axis of the element (Stark; Cai; Carll, 2010). The use of glulam has been growing abroad, with several structural and architectural applications, because it is a product where the limitation is solely due to the size of the machinery used, its use in Brazil is restricted due to the high cost of production (Zangiácomo; Lahr, 2007; Cunha; Matos, 2010). Among the quality parameters of the production, the number of laminae can result in beams of greater strength when compared to an individual lamina. This increase in the material performance is fundamental for the industry, since usually the quality control measures to determine the lamination quality are dependent on this magnitude (Falk; Colling, 1995). For Vital, Maciel and Della Lucia (2006), the strength, stability and service life of a bonded structure depend to greater strength, rigidity and durability of bonds
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