ADHESIVE BOND PERFORMANCE IN GLUE LINE SHEAR AND BENDING FOR GLUED LAMINATED GUADUA BAMBOO

Abstract

An adhesive experimental programme was developed in order to establish the adhesive performance for glued laminated guadua bamboo (GLG) and to determine the best type of adhesive and its optimal spread rate. Static bending and glue line shear tests were performed on GLG specimens assembled with four types of adhesives and using the manufacturer’s recommended spread rate. Urea-formaldehyde (UF), melamine-formaldehyde (MF), melamine-urea-formaldehyde (MUF), and a mixture of 50% of UF and 50% MF (MIX) were the selected adhesives. Differences in shear bond strength, modulus of rupture (MOR) and modulus of elasticity (MOE) among all the adhesives were not significant when using the spread rate recommended by the manufacturer. Finally, glue line tests were performed using six different adhesive spread rates of the MIX adhesive. Optimum adhesive spread rates of 300 and
150 g m-2 on the wide and narrow faces respectively are recommended based on the bond shear strength and percentage of bamboo failure. Additional delamination and long-term tests should be performed in order to validate the recommended spread rates.