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Effects of preservative treatment and the adhesive on mechanical characteristics of laminated lumber of two bamboo species

Articles

Journal/Conference:

SCIENTIA FORESTALIS

Language:

English

Author:

Rosa Rafael Amorim; Paes Juarez Benign; de Alcantara Segundinho Pedro Gutemberg; Goncalves Fabricio Gomes

Experts:

Vidaurre Graziela Baptista

Year:

2014

Volume:

42

Issue:

103

Pages:

451-462

Keywords:

Dendrocalamus giganteus; Bambusa vulgar's; mechanical properties; non-destructive testing

This work aimed to evaluate the mechanical properties of laminated bamboo lumber – LBL manufactured of two bamboo species, according to the preservative treatment and the adhesive employed. Laths of Dendrocalamus giganteus and Bambusa vulgaris bamboos aged more than three-years old were produced. Bamboo laths were soaked in water or in solution of disodium octaborate tetra hydrate (Na(2)B(8)O(13 center dot)4H(2)O) – Timbor, to 2%. Both treatments ran for 15 days. After treated and air seasoned, the laths were transformed into 5 x 30 x 470 mm (thickness x width x length) blades and employed in the manufacture of LBLs. Isocyanate emulsion (EPI), melamine urea formaldehyde (MUF), polyvinyl acetate cross (PVAc) and resorcinol formaldehyde (RF) were employed. LBLs were evaluated for compressive strength parallel to fibers, resistance in the glue line and static bending. Static bending was evaluated by destructive and non-destructive testing methods. The non-destructive methods used to estimate the modulus of elasticity of LBLs were Stress Wave SW, longitudinal vibration – V-L and transverse vibration – V-T The methods of V-L and V-T were efficient for the estimation of the modulus of elasticity (MOE) for the manufactured LBLs. To estimate of the modulus of rupture (MOR), the method of V-T was the best method. In general, the resistance of the LBLs was not influenced by the preservative treatment; adhesives MUF and RF showed better performance.