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      Caracterização de partículas de açaí visando seu potencial uso na construção civil Translated title: Characterization of acai waste particles for civil construction use

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          Abstract

          RESUMO Na Amazônia, o principal potencial de contribuição para os Objetivos de Desenvolvimento Sustentável (ODS), está no aproveitamento de resíduos da agroindústria para uso na construção civil, como alternativa de novos materiais sustentáveis. Neste contexto, objetivou-se com este trabalho avaliar o potencial uso de partículas de resíduos de açaí (Euterpe oleracea e Euterpe precatoria) caracterizando-as física, química, térmica e morfologicamente. Foram realizados ensaios de densidade por picnometria, verificação de teor de umidade, e dos teores de lignina, celulose e extrativos, de acordo com os parâmetros normativos da TAPPI 204, 211 e 222. O resultado da densidade média das partículas é de 1,49 g.cm-3, com teor de umidade variando de 2 a 6%. Em relação à composição química, observou-se maiores teores de lignina e extrativos, e redução de celulose em relação à outras fibras vegetais. Através da Microscopia Eletrônica de Varredura (MEV), observou-se a presença somente do endocarpo do caroço de açaí nas partículas de 8 e 14 Tyler, e maior predominância de fibras nas partículas de 48, 100 e 200 Tyler. O conhecimento das características físico-químicas das partículas de resíduo de açaí faz-se necessário para subsidiar etapas de processamento de compósitos com uso destes materiais. Além disso, a utilização de um resíduo como o caroço do açaí potencializa a redução dos impactos ambientais, fornecendo, principalmente para a construção civil, a possibilidade de produção de novos materiais mais ecológicos, gerando indicadores de sustentabilidade nas edificações da Amazônia.

          Translated abstract

          ABSTRACT In the Amazon, the main potential for contributing to the Sustainable Development Goals (SDG) lies in using agro industry waste in civil construction as an alternative for sustainable materials. In this context, this study aimed to assess the potential use of acai (Euterpe oleracea and Euterpe precatoria) waste particles to create composites that may be used in more sustainable buildings. Density assays were performed using picnometry. The moisture levels were measured and, lignin, cellulose and extractive contents were assessed according to the parameters of TAPPI 204, 211, and 222. Density analyses were performed using picnometry, moisture was analyzed, and lignin, cellulose, and extractive contents were assessed according to the parameters of TAPPI 204, 211, and 222. The results showed that the mean particle density is 1.49 g.cm-3 and the moisture content ranged from 2 to 6%. Regarding chemical make-up, higher lignin and extractive contents were found, in addition to a reduction in cellulose compared to other plant fibers. Scanning electron microscopy (SEM) revealed the presence of only the endocarp of açaí stone in particles of 8 and 14 Tyler and a higher prevalence of fibers in particles of 48, 100, and 200 Tyler. Knowing the characteristics and behaviors of açaí waste particles is important to lay basis for composite processing stages using this material. Moreover, the use of acai stones reduce the environmental impacts, allowing mainly civil construction to produce new, more ecological materials that lead to sustainability indicators in buildings of the Amazon.

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          Most cited references14

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          Native Cellulose: Structure, Characterization and Thermal Properties

          In this work, the relationship between cellulose crystallinity, the influence of extractive content on lignocellulosic fiber degradation, the correlation between chemical composition and the physical properties of ten types of natural fibers were investigated by FTIR spectroscopy, X-ray diffraction and thermogravimetry techniques. The results showed that higher extractive contents associated with lower crystallinity and lower cellulose crystallite size can accelerate the degradation process and reduce the thermal stability of the lignocellulosic fibers studied. On the other hand, the thermal decomposition of natural fibers is shifted to higher temperatures with increasing the cellulose crystallinity and crystallite size. These results indicated that the cellulose crystallite size affects the thermal degradation temperature of natural fibers. This study showed that through the methods used, previous information about the structure and properties of lignocellulosic fibers can be obtained before use in composite formulations.
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            A review of recent research on the use of cellulosic fibres, their fibre fabric reinforced cementitious, geo-polymer and polymer composites in civil engineering

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              Effect of cellulose, hemicellulose and lignin contents on pyrolysis and combustion of natural fibers

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rmat
                Matéria (Rio de Janeiro)
                Matéria (Rio J.)
                Rede Latino-Americana de Materiais (Rio de Janeiro, RJ, Brazil )
                1517-7076
                2019
                : 24
                : 3
                : e12435
                Affiliations
                [01] Manaus Amazonas orgnameUniversidade Federal do Amazonas orgdiv1PPGEC orgdiv2Laboratório de Materiais da Amazônia e Compósitos - LaMAC Brazil
                [02] Santarém Pará orgnameEmbrapa Amazônia Oriental Brazil
                Article
                S1517-70762019000300347
                10.1590/s1517-707620190003.0750
                4d55baf7-f737-4918-a10f-018fa0804d63

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 16 May 2019
                : 07 June 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 42, Pages: 0
                Product

                SciELO Brazil

                Categories
                Artigos

                açaí,MEV,resíduos agroindustriais,construção sustentável,acai,SEM,sustainable construction,agro industry waste

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