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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
20/09/2021 |
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Data da última atualização: |
10/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FONSECA, C. S.; SCATOLINO, M. V.; SILVA, L. E.; MARTINS, M. A.; GUIMARÃES JUNIOR, M.; TONOLI, G. H. D. |
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Afiliação: |
MARIA ALICE MARTINS, CNPDIA. |
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Título: |
Valorization of jute biomass: Performance of fiber?cement composites extruded with hybrid reinforcement (fibers and nanofbrils). |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Waste and Biomass Valorization, v. 12, 2021). |
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Páginas: |
5743?5761 |
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DOI: |
https://doi.org/10.1007/s12649-021-01394-1 |
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Idioma: |
Inglês |
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Conteúdo: |
In this study, the characteristics of jute fbers and cellulose nanofbrils (CNFs) and their impacts on mechanical strength were compared, particularly from the standpoint of their application as reinforcement in extruded fber–cement composites. Raw jute fbers were subjected to an alkaline treatment before being fbrillated into CNFs. The fber–cement composites were produced with jute fbers (0.5% and 2%) and CNFs (0.5% and 2%) via extrusion process. Both percentages of reinforcement were based on the cement mass. In addition, hybrid composites with a mixture of fbers and CNFs were produced. Hydroxypropyl methylcellulose and carboxylic polyether were used as additives to improve the mixture’s rheology. The composites were subjected to natural weathering for 5 months before being analyzed for their physical and mechanical properties. CNFs and jute fbers subjected to NaOH treatment presented a higher initial degradation temperature (Tonset). The apparent porosity decreased for all compositions studied, reaching a 75% reduction for the sample reinforced with 2% CNFs. Fiber–cement with a hybrid reinforcement of 1.5% CNFs+0.5% fbers exhibited the strongest mechanical performance. All compositions showed a decrease in the modulus of elasticity after natural weathering. In contrast, the modulus of rupture and the limit of proportionality showed an average gain of 1 MPa for fber–cement composites produced with hybrid reinforcements. The better mechanical performance of the hybrid formulations may be owing to the synergistic work of the fbers and CNFs, suggesting the potential of cellulose CNFs for use as reinforcement in cement-based composites. MenosIn this study, the characteristics of jute fbers and cellulose nanofbrils (CNFs) and their impacts on mechanical strength were compared, particularly from the standpoint of their application as reinforcement in extruded fber–cement composites. Raw jute fbers were subjected to an alkaline treatment before being fbrillated into CNFs. The fber–cement composites were produced with jute fbers (0.5% and 2%) and CNFs (0.5% and 2%) via extrusion process. Both percentages of reinforcement were based on the cement mass. In addition, hybrid composites with a mixture of fbers and CNFs were produced. Hydroxypropyl methylcellulose and carboxylic polyether were used as additives to improve the mixture’s rheology. The composites were subjected to natural weathering for 5 months before being analyzed for their physical and mechanical properties. CNFs and jute fbers subjected to NaOH treatment presented a higher initial degradation temperature (Tonset). The apparent porosity decreased for all compositions studied, reaching a 75% reduction for the sample reinforced with 2% CNFs. Fiber–cement with a hybrid reinforcement of 1.5% CNFs+0.5% fbers exhibited the strongest mechanical performance. All compositions showed a decrease in the modulus of elasticity after natural weathering. In contrast, the modulus of rupture and the limit of proportionality showed an average gain of 1 MPa for fber–cement composites produced with hybrid reinforcements. The better mechanical performance of the hybrid formul... Mostrar Tudo |
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Palavras-Chave: |
Cellulose fibers; CNF; Lignocellulose fiber; Mechanical fibrillation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02476naa a2200253 a 4500
001 2134590
005 2022-06-10
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s12649-021-01394-1$2DOI
100 1 $aFONSECA, C. S.
245 $aValorization of jute biomass$bPerformance of fiber?cement composites extruded with hybrid reinforcement (fibers and nanofbrils).$h[electronic resource]
260 $c2021
300 $a5743?5761
520 $aIn this study, the characteristics of jute fbers and cellulose nanofbrils (CNFs) and their impacts on mechanical strength were compared, particularly from the standpoint of their application as reinforcement in extruded fber–cement composites. Raw jute fbers were subjected to an alkaline treatment before being fbrillated into CNFs. The fber–cement composites were produced with jute fbers (0.5% and 2%) and CNFs (0.5% and 2%) via extrusion process. Both percentages of reinforcement were based on the cement mass. In addition, hybrid composites with a mixture of fbers and CNFs were produced. Hydroxypropyl methylcellulose and carboxylic polyether were used as additives to improve the mixture’s rheology. The composites were subjected to natural weathering for 5 months before being analyzed for their physical and mechanical properties. CNFs and jute fbers subjected to NaOH treatment presented a higher initial degradation temperature (Tonset). The apparent porosity decreased for all compositions studied, reaching a 75% reduction for the sample reinforced with 2% CNFs. Fiber–cement with a hybrid reinforcement of 1.5% CNFs+0.5% fbers exhibited the strongest mechanical performance. All compositions showed a decrease in the modulus of elasticity after natural weathering. In contrast, the modulus of rupture and the limit of proportionality showed an average gain of 1 MPa for fber–cement composites produced with hybrid reinforcements. The better mechanical performance of the hybrid formulations may be owing to the synergistic work of the fbers and CNFs, suggesting the potential of cellulose CNFs for use as reinforcement in cement-based composites.
653 $aCellulose fibers
653 $aCNF
653 $aLignocellulose fiber
653 $aMechanical fibrillation
700 1 $aSCATOLINO, M. V.
700 1 $aSILVA, L. E.
700 1 $aMARTINS, M. A.
700 1 $aGUIMARÃES JUNIOR, M.
700 1 $aTONOLI, G. H. D.
773 $tWaste and Biomass Valorization$gv. 12, 2021).
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Biblioteca |
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Origem |
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Cutter |
Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
18/01/2000 |
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Data da última atualização: |
14/02/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Nacional - B |
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Autoria: |
ROMAO, R. L.; QUEIROZ, M. A. de; MARTINS, P. S.; CORDEIRO, C. M. T. |
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Afiliação: |
MANOEL ABÍLIO DE QUEIROZ, CPATSA. |
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Título: |
Caracterização morfológica de acessos de melancia do Banco Ativo de Germoplasma (BAG) de cucurbitáceas para o Nordeste do Brasil. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Horticultura Brasileira, Brasília, DF, v. 17, p. 23-25, dez. 1999. |
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Idioma: |
Português |
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Notas: |
Suplemento. |
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Conteúdo: |
A coleta de acessos de melancia no Nordeste do Brasil teve início em 1985, quando foram realizadas visitas a áreas de produtores em Petrolina-PE e a alguns municípios vizinhos. |
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Palavras-Chave: |
Morfologia de planta; Nordeste; Northeast. |
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Thesagro: |
Banco de Germoplasma; Citrullus Lanatus; Melancia; Recurso Genético. |
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Thesaurus NAL: |
gene banks; genetic resources; plant morphology; watermelons. |
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Categoria do assunto: |
G Melhoramento Genético |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/179711/1/Horticultura-Brasileira-v.17-p.23-25-1999.pdf
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Marc: |
LEADER 01070naa a2200301 a 4500
001 1133838
005 2022-02-14
008 1999 bl uuuu u00u1 u #d
100 1 $aROMAO, R. L.
245 $aCaracterização morfológica de acessos de melancia do Banco Ativo de Germoplasma (BAG) de cucurbitáceas para o Nordeste do Brasil.
260 $c1999
500 $aSuplemento.
520 $aA coleta de acessos de melancia no Nordeste do Brasil teve início em 1985, quando foram realizadas visitas a áreas de produtores em Petrolina-PE e a alguns municípios vizinhos.
650 $agene banks
650 $agenetic resources
650 $aplant morphology
650 $awatermelons
650 $aBanco de Germoplasma
650 $aCitrullus Lanatus
650 $aMelancia
650 $aRecurso Genético
653 $aMorfologia de planta
653 $aNordeste
653 $aNortheast
700 1 $aQUEIROZ, M. A. de
700 1 $aMARTINS, P. S.
700 1 $aCORDEIRO, C. M. T.
773 $tHorticultura Brasileira, Brasília, DF$gv. 17, p. 23-25, dez. 1999.
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