Reuse of printed circuit boards substrate in the production of mortars
Reaproveitamento do substrato de placas de circuito impresso na produção de argamassas
José Ricardo Ferrari, Rosana Vilarim da Silva, Desílvia Machado Louzada, Iara Mendonça Tinti
Abstract
Recycling electronic waste is one of the main environmental challenges faced by society today. In this sense, the purpose of this study is to evaluate the effect of using the residue of printed circuit boards (PCB) as a substitute for sand in mortars. The boards were taken from discarded electronic equipment and, to obtain the granular material, the boards, free of their components, were crushed. The residue obtained was sieved and separated into four granulometric ranges: # 1.2 mm; # 0.6 mm; # 0.3 mm and # 0.15 mm. Mortars were produced with partial replacement of 5% and 10% of the sand with the equivalent volume of residue in each of the size ranges, in addition to a reference mortar, without residue. For the characterization of the mortars, compressive strength, water absorption, percentage of voids and density tests were performed, in addition to analysis by scanning electron microscopy and environmental, leaching and solubilization, analyses. In general, the properties of the mortars, with the incorporation of the PCB residue, were not affected by the introduction of the residue, making its use feasible. However, as it is classified as non-inert in environmental analysis it is necessary to control its final disposal.
Keywords
Resumo
A reciclagem do lixo eletrônico é um dos principais desafios ambientais enfrentados pela sociedade atualmente. Encontrar novas possibilidades de uso para esses resíduos pode auxiliar a solucionar alguns problemas. Neste sentido, a proposta deste trabalho é avaliar o efeito do uso do resíduo de placas de circuito impresso (PCB), como substituto da areia em argamassas. As placas foram retiradas de equipamentos eletrônicos descartados e, para a obtenção do material granular, as placas, livres de seus componentes, foram trituradas. O resíduo obtido foi peneirado e separado em quatro faixas granulométricas: # 1.2 mm; # 0.6 mm; # 0.3 mm e # 0.15 mm. Foram produzidas argamassas com substituição parcial de 5% e 10% da areia pelo volume equivalente do resíduo de cada uma das faixas granulométricas, além de uma argamassa de referência. Para a caracterização das argamassas foram realizados ensaios de resistência à compressão, absorção de água, índice de vazios e densidade, além de análise por microscopia eletrônica de varredura e análises ambientais, de lixiviação e solubilização. As propriedades das argamassas com o resíduo de placa de circuito impresso não foram afetadas pela introdução do resíduo, viabilizando a utilização do mesmo. No entanto, por ser classificado como não inerte nas análises ambientais, segundo a norma NBR 10004:2004, é necessário controle na sua disposição final.
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Referências
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Submetido em:
29/10/2021
Aceito em:
30/06/2022
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