Abstract In search of new materials from industrial waste, aiming at cost, efficiency and reduction of environmental liabilities, this study aimed to evaluate the physical, mechanical, acoustic and thermal characteristics of sandwich panels produced with sheets of Schizolobium amazonicum (paricá) and egg carton core made of cardboard, glued with adhesive phenol formaldehyde (FF), urea formaldehyde (UF) and interleaved the sheets glued with both. The panels were evaluated through thermal, acoustic, physical and mechanical tests. The FF and UF adhesives influenced the physical-mechanical properties of the panels. For thermal conductivity and thermal resistance, it was found that all panels met the normative requirements of NBR 15220 (ABNT, 2005) with emphasis on panels produced with FF. Therefore, the use of paricá sheets 32x12x0.2 cm (length, width and thickness, respectively) and egg box as a core with adhesive, proved to be promising for some uses in civil construction, in addition to adding value to the egg crate residues as thermal and acoustic insulators, can minimize the disposal of raw material in the environment.

Resumo Em busca de novos materiais a partir de resíduos industriais, visando ao custo, à eficiência e à redução do passivo ambiental, este trabalho teve como objetivo avaliar as características físicas, mecânicas, acústicas e térmicas de painéis sanduíche produzidos com lâminas de Schizolobium amazonicum (paricá) e núcleo de caixa de ovos feitos de papelão coladas com o adesivo fenol-formaldeído (FF) e com o adesivo ureia-formaldeído (UF), intercalando-se estas com lâminas coladas com ambos (FF+UF). Os painéis foram avaliados por meio de ensaios térmicos, acústicos, físicos e mecânicos. Os adesivos FF e UF influenciaram nas propriedades físico-mecânicas dos painéis. Para a condutividade térmica e resistência térmica, verificou-se que todos os painéis atingiram as exigências normativas da NBR 15220 (ABNT, 2005), com destaque para os painéis produzidos com FF. Sendo assim, a utilização das lâminas de paricá de 32x12x0,2 cm (comprimento, largura e espessura respectivamente) e de caixa de ovo como núcleo com adesivo se mostrou promissora para algumas aplicações na construção civil, além de agregar valor aos resíduos de caixa de ovo como isolantes térmicos e acústicos, por minimizar o descarte de matéria-prima no meio ambiente.

ABSTRACT Despite the increasing use of plaster as a construction material, due to its numerous advantages when compared to cement, its use is still restricted, because of its low mechanical resistance and high solubility in water. In this context, research has been carried out related to the addition of nanomaterials to improve the mechanical and physical properties of plaster in civil construction. A highly available, low-cost nanomaterial with excellent properties is nanotalc. In this work, nanocomposites with dimensions of 40 × 40 × 160 mm were produced with ultrafine micronized nanotalc replacing plaster in proportions of 0%; 0.5%; 1%; 1.5% and 2%. The physical and mechanical properties of the nanocomposites were evaluated according to standards. The nanocomposites produced with 1% nanotalc showed satisfactory results for physical and mechanical properties, with an increase of 1.8% in apparent density and 24.12% in compressive strength, and a decrease in water absorption of 6.23%, compared to the composite without the incorporation of nanotalc. The production of nanocomposites with the incorporation of 1% nanotalc is viable and shown to be promising, presenting potential for application as linings and internal partitions, since they showed low water absorption due to the hydrophobicity of nanotalc.