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| 4. |  | NASCIMENTO, M. K. S.; MOTA, P. V. M. da; CRUZ, M. A. S.; ARAGÃO, R. de. Análise da alteração do uso e cobertura da terra em dois períodos na bacia do Rio Japaratuba, SE. In: ENCONTRO DE RECURSOS HÍDRICOS, EM SERGIPE, 8., 2015, Aracaju, SE. Anais... Aracaju, SE: Embrapa, 2016. p. 17-21.| Biblioteca(s): Embrapa Tabuleiros Costeiros. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
11/08/2020 |
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Data da última atualização: |
16/08/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 4 |
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Autoria: |
SILVA, D. W.; SCATOLINO, M. V.; PEREIRA, T. G. T.; VILELA, A. P.; EUGENIO, T. M. C.; MARTINS, M. A.; MENDES, R. F.; BUFALINO, L.; TONOLI, G. H. D.; MENDES, L. M. |
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Afiliação: |
MARIA ALICE MARTINS, CNPDIA. |
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Título: |
Influence of thermal treatment of eucalyptus fibers on the physical-mechanical properties of extruded fiber-cement composites. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Materials Today: Proceedings, v. 31, 2020. |
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Páginas: |
S348-S352 |
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ISSN: |
2214-7853 |
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DOI: |
https://doi.org/10.1016/j.matpr.2020.04.764 |
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Idioma: |
Inglês |
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Conteúdo: |
This study proposes to evaluate the effect of the heat treatment in commercial eucalyptus fibers (produced by thermo-mechanical process) on the physical-mechanical properties of extruded fiber-cements composites. The fibers were treated with different temperatures of heat treatment (140, 170, 200 and 230 °C) for 60 min in a “Macro-ATG” oven. The chemical and morphological characteristics of the natural fibers were evaluated before and after the thermal treatment. The cementitious paste was composed by 67.9% cement, 29.1% limestone and 3% eucalyptus fibers. Hydroxypropylmethylcellulose (HPMC) and polyether carboxylic acid (ADVA 175) were added to the cement paste both in 1% (based on the cement mass) to facilitate the extrusion process. The thermal treatments at 200 and 230 °C were efficient in reducing the extractives content. On the other hand, a decrease in length, diameter and lumen size of the fibers has occurred. The decrease in extractives content did not influence the properties of water absorption, modulus of rupture (MOR) and modulus of elasticity (MOE). The increase in lignin content resulted in increase for apparent porosity and decrease of the toughness in reinforced fiber-cement produced with fibers treated at 200 and 230 °C. The application of the thermal treatment for the fibers did not show improvement in fiber-cement in the evaluated conditions. It is recommended to evaluate other properties of the fiber-cement reinforced with the mentioned treated fibers, such as natural and laboratorial weathering. MenosThis study proposes to evaluate the effect of the heat treatment in commercial eucalyptus fibers (produced by thermo-mechanical process) on the physical-mechanical properties of extruded fiber-cements composites. The fibers were treated with different temperatures of heat treatment (140, 170, 200 and 230 °C) for 60 min in a “Macro-ATG” oven. The chemical and morphological characteristics of the natural fibers were evaluated before and after the thermal treatment. The cementitious paste was composed by 67.9% cement, 29.1% limestone and 3% eucalyptus fibers. Hydroxypropylmethylcellulose (HPMC) and polyether carboxylic acid (ADVA 175) were added to the cement paste both in 1% (based on the cement mass) to facilitate the extrusion process. The thermal treatments at 200 and 230 °C were efficient in reducing the extractives content. On the other hand, a decrease in length, diameter and lumen size of the fibers has occurred. The decrease in extractives content did not influence the properties of water absorption, modulus of rupture (MOR) and modulus of elasticity (MOE). The increase in lignin content resulted in increase for apparent porosity and decrease of the toughness in reinforced fiber-cement produced with fibers treated at 200 and 230 °C. The application of the thermal treatment for the fibers did not show improvement in fiber-cement in the evaluated conditions. It is recommended to evaluate other properties of the fiber-cement reinforced with the mentioned treated fibers, s... Mostrar Tudo |
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Palavras-Chave: |
Cementitious composites; Chemical characterization; Extruded process; Morphological characterization. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02534naa a2200313 a 4500
001 2124283
005 2022-08-16
008 2020 bl uuuu u00u1 u #d
022 $a2214-7853
024 7 $ahttps://doi.org/10.1016/j.matpr.2020.04.764$2DOI
100 1 $aSILVA, D. W.
245 $aInfluence of thermal treatment of eucalyptus fibers on the physical-mechanical properties of extruded fiber-cement composites.$h[electronic resource]
260 $c2020
300 $aS348-S352
520 $aThis study proposes to evaluate the effect of the heat treatment in commercial eucalyptus fibers (produced by thermo-mechanical process) on the physical-mechanical properties of extruded fiber-cements composites. The fibers were treated with different temperatures of heat treatment (140, 170, 200 and 230 °C) for 60 min in a “Macro-ATG” oven. The chemical and morphological characteristics of the natural fibers were evaluated before and after the thermal treatment. The cementitious paste was composed by 67.9% cement, 29.1% limestone and 3% eucalyptus fibers. Hydroxypropylmethylcellulose (HPMC) and polyether carboxylic acid (ADVA 175) were added to the cement paste both in 1% (based on the cement mass) to facilitate the extrusion process. The thermal treatments at 200 and 230 °C were efficient in reducing the extractives content. On the other hand, a decrease in length, diameter and lumen size of the fibers has occurred. The decrease in extractives content did not influence the properties of water absorption, modulus of rupture (MOR) and modulus of elasticity (MOE). The increase in lignin content resulted in increase for apparent porosity and decrease of the toughness in reinforced fiber-cement produced with fibers treated at 200 and 230 °C. The application of the thermal treatment for the fibers did not show improvement in fiber-cement in the evaluated conditions. It is recommended to evaluate other properties of the fiber-cement reinforced with the mentioned treated fibers, such as natural and laboratorial weathering.
653 $aCementitious composites
653 $aChemical characterization
653 $aExtruded process
653 $aMorphological characterization
700 1 $aSCATOLINO, M. V.
700 1 $aPEREIRA, T. G. T.
700 1 $aVILELA, A. P.
700 1 $aEUGENIO, T. M. C.
700 1 $aMARTINS, M. A.
700 1 $aMENDES, R. F.
700 1 $aBUFALINO, L.
700 1 $aTONOLI, G. H. D.
700 1 $aMENDES, L. M.
773 $tMaterials Today: Proceedings$gv. 31, 2020.
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