The society's development provides consequences such as the increasing generation of industrial waste. In the city of Franca, São Paulo's inland city, there are footwear industries that generate a large amount of leather waste during their production process. In most cases, there's no use of this waste and they're disposed of in landfills. A reuse alternative is the production of particleboards used in construction sectors. Therefore, one of the biggest challenges is the use of this leather waste adding value to the product and enabling the production of sustainable material. This work proposes the production of particleboards from Eucalyptus wood and leather fibers using castor oil polyurethane adhesive. In addition, the assessment of the leather fiber influence on modulus of rupture and elasticity obtained from a static bending test. The study investigated the proportion of 10%, 25% e 50% leather waste in relation to Eucalyptus particles and 10% castor oil polyurethane adhesive. The mechanical performance of the panels was evaluated based on ABNT NBR 14810-1 and 2 (2013;. The results allowed us to ascertain that the incorporation of 10% leather waste in particleboard rated them, according to NBR 14810-1 and 2 (2013; 2018), as structural panels of type P4 for use in dry conditions.

This research examined the influence of the compositions between coconut fiber (Cocos nucifera) and wood particles (Pinus taeda L. and Eucalyptus saligna) on physico-mechanical properties of homogeneous particleboards. The exploratory study was carried out under Tukey’s contrast test of means, at 5% significance level, with the following compositions: 100% coconut fiber (F100 P0 E0); 50% coconut fiber, 25% pine particles, and 25% eucalyptus particles (F50 P25 E25); and 50% of pine particles and 50% of eucalyptus particles (F0 P50 E50), with particle moisture content between 0% to 2% and 10%, in mass, of polyurethane-castor oil (PU-Castor) resin. Three panels were produced for each composition. The physico-mechanical properties such as density, moisture content, swelling in thickness after 24 h of immersion in water, perpendicular tensile strength, static bending strength, and modulus of elasticity were evaluated using standard methods. The results obtained indicated the potential for using coconut fiber for the production of homogeneous particleboards in view of the minimum criteria required by the normative documents, with emphasis on the physical property of swelling after 24 hours, which obtained a statistically equivalent average relative to the treatment that contained only wood particles.

<p class="Normal1">Atualmente a utilização de madeiras de florestas plantadas para fabricação de derivados vem crescendo, sendo as espécies <em>Hevea brasiliensis </em>e <em>Tectona grandis </em>alternativas devido à abrangência de seus reflorestamentos no Brasil. Considerando seus ciclos de produção em torno de 30 anos, essas espécies podem ser alternativas de matéria-prima para fabricação de derivados de madeira. O objetivo desse trabalho foi produzir painéis aglomerados utilizando as referidas espécies, aglutinando-as com adesivo poliuretano derivado do óleo de mamona. Os painéis foram avaliados de acordo com suas propriedades físico-mecânicas, com base na ABNT NBR 14810 - 1 e 2 e demais literaturas nacionais e internacionais. Foram considerados dois tratamentos empregando-se 10% e 5% de adesivo, ambos com mistura de 30% de seringueira e 70% de teca. Para cada tratamento foram produzidos três painéis e avaliados suas densidades, teor de umidade, inchamento em espessura, módulo de resistência à flexão estática, módulo de elasticidade e resistência à tração perpendicular. Os resultados obtidos evidenciaram potencialidades de uso das duas espécies de madeira para a produção de painéis aglomerados. Os painéis produzidos com 10% de adesivo apresentaram melhores resultados em comparação aos painéis com 5%, entretanto, o emprego de 5% de adesivo atende às exigências normativas brasileiras.</p>

Utilização de escória de alumínio como adição na argamassa: análise no estado fresco e endurecido Use of aluminium slag as addition in mortar: analysis in the fresh and hardened state Uso de escoria de alumínio com o adición em el morteiro: análisis em estado fresco y endurecido

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