The objective of this study was to evaluate the feasibility of construction and demolition (C&D) waste wood to produce of particleboard. The raw material was obtained from a waste recycling company and it was divided into four types of materials: MDF (medium density fiberboard), MDP (medium density particleboard), plywood and timber. After reduction of these wood product residues to particles, particleboards were produced, in the UFPR Laboratory, with urea-formaldehyde resin and a target density of 0,75 g / cm³ and their physical and mechanical properties were determined. Particleboards made from industrial Pinus spp. particles were also produced as control samples. C&D wood waste showed potential for use as raw material for particleboard. The properties of particleboard made of recycled timber, MDP, plywood and the mixture of the four sources of material indicated that particleboard industries could use these waste resources for the production of the inner layer of MDP products.Universidad del B í o -B í o Maderas. Ciencia y tecnología 20(4): 681 -690, 2018 The amount and composition of C&D waste depend on its origins as it is associated with regional construction techniques and material types. The range of wood products in the United States C&D waste was estimated to be 6-7% (Cochran and Townsend 2010), while in Brazil, the amount of wood can be even higher, 10-16% (Miranda et al. 2009).Recycling of C&D waste is already common practice in most EU countries.

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Wood-cement composite (WCC) is a potential construction material for tropical regions, due to its physico-mechanical properties and resistance to decay and fungi attack. However it is important to test alternative production methods and wood materials that are easier and cheaper than those traditionally used, in order to create a higher demand for this product. The aim of this work was to evaluate the use of wood from four Amazonian species (Eschweilera coriaceae, Swartzia recurva, Manilkara amazonica and Pouteria guianensis) in the production of wood-cement composites through a vibro-dynamic compression process, an alternative method to the use of a hydraulic press. The inhibition degree caused by the wood to the cement cure, measured by the factor CA, indicated that all species were compatible with Portland cement (CP II-Z). WCC with densities higher than 1,100 kg m-3 (produced with E. coriaceae and S. recurva particles) showed compressive strength values higher than 10 MPa, which fulfills the minimum requirement for lightweitgh reinforced concrete blocks for structural use.

RESUMO O objetivo deste trabalho foi avaliar a qualidade das juntas coladas de madeira de Inga alba e Swartzia recurva utilizando adesivos a base de acetato de polivinila (PVAc) e emulsão polimérica de isocianato (EPI) em gramaturas de 150 e 200 g.m². A resistência das juntas coladas foi avaliada por meio de ensaios de cisalhamento, com base nos procedimentos descritos na norma EN 13354 (2008). O aumento na gramatura não influenciou nos resultados de cisalhamento, indicando os benefícios em termos econômicos com a redução no consumo do adesivo. As juntas coladas com madeira de Swartzia recurva com o adesivo EPI, nas duas gramaturas avaliadas, atingiram o valor mínimo de 2,5 MPa referente ao 5º percentil inferior estabelecido pela norma EN 13353 (2008). Os resultados demonstraram a viabilidade de uso da madeira de Inga alba e Swartzia recurva para produção de painéis colados lateralmente - EGP, com adesivo EPI e gramatura de 150 g.m².

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