Estudo da aderência da fibra de carbono em elementos de madeira lamelada colada

Abstract

The concern with sustainability of the construction industry associated with the development of modern structural adhesives for timber products have gained notoriety in the light of the environmental benefits of certified timber and diversified structural applications of glued timber. Glued Laminated Timber (GLT) is a viable alternative for the rational use of timber, because it allows the use of timber from juvenile trees plantations and mitigate the intrinsic conditions of these timbers, such as the high presence of defects that reduce the load capacity of the structural element. Additionally, engineered timber could be produced with timber cut from smaller diameter logs and lower quality. However, the performance of the engineered product depends on the species of the timber, thickness and position of the lamellae, type of adhesive, and bonding strength. This work aimed to study the adhesion of the carbon fiber reinforced polymer to the surface of the MLC produced with certified timber. The selected timber species was Eucalyptus urophylla COP 1404 clone, which is characterized by rapid growth. To reach the objective, a two-component castor-based polyurethane adhesive Poliol Bio and MDI type polymeric isocyanate, due to the ease of obtaining it on the market and ease of application. The experimental program focused on the physical and mechanical properties of sawn timber and the mechanical properties of carbon-fiber reinforced glulam compared to no reinforced glulam, using statistical methods to analyze the strength of the prototypes. The results indicated that the polyurethane adhesive was efficient in gluing both the timber surface and the carbon fiber, so that the shear occurred in the timber, in addition to the parallel compression and bending verifications having shown a single-body behavior, having no discontinuity points due to the glue line, with the break occurring in the timber.