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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
05/04/2021 |
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Data da última atualização: |
05/04/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SANTOS, R. F.; RIBEIRO, J. C. L.; CARVALHO, J. M. F. de; MAGALHAES, W. L. E.; PEDROTI, L. G.; NALON, G. H.; LIMA, G. E. S. de. |
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Afiliação: |
RODRIGO FELIPE SANTOS, UFV; JOSÉ CARLOS LOPES RIBEIRO, UFV; JOSÉ MARIA FRANCO DE CARVALHO, UFV; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; LEONARDO GONÇALVES PEDROTI, UFV; GUSTAVO HENRIQUE NALON, UFV; GUSTAVO EMILIO SOARES DE LIMA, UFV. |
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Título: |
Nanofibrillated cellulose and its applications in cement-based composites: a review. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Construction and Building Materials, v. 288, 123122, June 2021. 17 p. |
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DOI: |
https://doi.org/10.1016/j.conbuildmat.2021.123122 |
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Idioma: |
Inglês |
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Conteúdo: |
Cellulose is an abundant and biodegradable natural material that is not derived from petroleum. With the growing demand for high-performance materials, the interest in using nanocelluloses in different areas has increased. Nanofibrillated celluloses (NFCs) are result from mechanical processing of cellulose fibers, with or without chemical pretreatments. Characteristics such as large surface area, hydroxyl groups on their surface, high mechanical strength, and high length/width ratio give NFC beneficial effects when incorporated into cement composites. This work presents a review of researches carried out in recent years in the area of cement systems incorporating NFC. The characteristics of these nanocelluloses, their production, and the effect that the nanomaterial has on the behavior of cement composites are presented. It was observed that the addition of NFC brings relevant increases in mechanical properties. The maximum increments reported in the literature were 43% in compressive strength, 106% in flexural strength, 5% in modulus of elasticity, 71% in flexural modulus, 50% in fracture energy, and 192% in toughness. Furthermore, NFC has the potential to enhance the durability of the cement composites, since the nanoadmixtures provided cement matrices with lower sulfate penetration (~50%), greater thermal resistance (no microcracks at 250 C), and greater resistance to accelerated aging (an increase of 20% in flexural strength and 25% in modulus of elasticity after 200 wet-dry cycles). MenosCellulose is an abundant and biodegradable natural material that is not derived from petroleum. With the growing demand for high-performance materials, the interest in using nanocelluloses in different areas has increased. Nanofibrillated celluloses (NFCs) are result from mechanical processing of cellulose fibers, with or without chemical pretreatments. Characteristics such as large surface area, hydroxyl groups on their surface, high mechanical strength, and high length/width ratio give NFC beneficial effects when incorporated into cement composites. This work presents a review of researches carried out in recent years in the area of cement systems incorporating NFC. The characteristics of these nanocelluloses, their production, and the effect that the nanomaterial has on the behavior of cement composites are presented. It was observed that the addition of NFC brings relevant increases in mechanical properties. The maximum increments reported in the literature were 43% in compressive strength, 106% in flexural strength, 5% in modulus of elasticity, 71% in flexural modulus, 50% in fracture energy, and 192% in toughness. Furthermore, NFC has the potential to enhance the durability of the cement composites, since the nanoadmixtures provided cement matrices with lower sulfate penetration (~50%), greater thermal resistance (no microcracks at 250 C), and greater resistance to accelerated aging (an increase of 20% in flexural strength and 25% in modulus of elasticity after 200 wet... Mostrar Tudo |
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Palavras-Chave: |
Cement composites; Civil construction; Compósito; Construção civil; Durabilidade; Mechanical performance; Nanofibrillated celluloses; Nanofribilas de celulose. |
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Thesagro: |
Cimento. |
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Thesaurus Nal: |
Durability. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02519naa a2200325 a 4500
001 2131047
005 2021-04-05
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.conbuildmat.2021.123122$2DOI
100 1 $aSANTOS, R. F.
245 $aNanofibrillated cellulose and its applications in cement-based composites$ba review.$h[electronic resource]
260 $c2021
520 $aCellulose is an abundant and biodegradable natural material that is not derived from petroleum. With the growing demand for high-performance materials, the interest in using nanocelluloses in different areas has increased. Nanofibrillated celluloses (NFCs) are result from mechanical processing of cellulose fibers, with or without chemical pretreatments. Characteristics such as large surface area, hydroxyl groups on their surface, high mechanical strength, and high length/width ratio give NFC beneficial effects when incorporated into cement composites. This work presents a review of researches carried out in recent years in the area of cement systems incorporating NFC. The characteristics of these nanocelluloses, their production, and the effect that the nanomaterial has on the behavior of cement composites are presented. It was observed that the addition of NFC brings relevant increases in mechanical properties. The maximum increments reported in the literature were 43% in compressive strength, 106% in flexural strength, 5% in modulus of elasticity, 71% in flexural modulus, 50% in fracture energy, and 192% in toughness. Furthermore, NFC has the potential to enhance the durability of the cement composites, since the nanoadmixtures provided cement matrices with lower sulfate penetration (~50%), greater thermal resistance (no microcracks at 250 C), and greater resistance to accelerated aging (an increase of 20% in flexural strength and 25% in modulus of elasticity after 200 wet-dry cycles).
650 $aDurability
650 $aCimento
653 $aCement composites
653 $aCivil construction
653 $aCompósito
653 $aConstrução civil
653 $aDurabilidade
653 $aMechanical performance
653 $aNanofibrillated celluloses
653 $aNanofribilas de celulose
700 1 $aRIBEIRO, J. C. L.
700 1 $aCARVALHO, J. M. F. de
700 1 $aMAGALHAES, W. L. E.
700 1 $aPEDROTI, L. G.
700 1 $aNALON, G. H.
700 1 $aLIMA, G. E. S. de
773 $tConstruction and Building Materials$gv. 288, 123122, June 2021. 17 p.
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Registro original: |
Embrapa Florestas (CNPF) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
22/08/1996 |
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Data da última atualização: |
23/08/2013 |
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Tipo da produção científica: |
Comunicado Técnico/Recomendações Técnicas |
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Autoria: |
PEREIRA, J. C. R.; SANTOS, A. F. dos. |
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Afiliação: |
EMBRAPA-CNPSD. |
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Título: |
Avaliacao de fungicidas no controle ao cancro estriado do painel de sangria da seringueira. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Manaus: EMBRAPA-CNPSD, 1985. |
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Páginas: |
5p. |
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Série: |
(EMBRAPA-CNPSD. Comunicado Tecnico, 47). |
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ISSN: |
0101-2118 |
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Idioma: |
Português |
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Conteúdo: |
Com o objetivo de selecionar produtos efetivos contra o cancro estriado, foram conduzidos dois ensaios; no primeiro, procurou-se avaliar o efeito preventivo e no segundo, o efeito curativo. Foram testados os seguintes produtos: Mancozeb, Clorotalonile metalaxil-Mancozeb, Metalaxil e Captafol utilizado como padrao. Dentre os seis fungicidas testados, os produtos a base de Metalaxil, Ridomil e Ridomil-Mancozeb apresentaram bom desempenho no controle de Phytophthora spp., evidenciando os efeitos preventivo e curativo desses produtos. Com base nesses resultados, o Metalaxil-Mancozeb pode ser indicado como alternativa para o controle do cancro estriado. |
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Palavras-Chave: |
Bahia; Brasil; Controle de doenca; Fungal diseases; Fungicides evaluation; Painel; Panel; Rubber tree; Species. |
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Thesagro: |
Cancro Estriado; Controle Químico; Doença; Espécie; Fungicida; Fungo; Hevea; Hevea Brasiliensis; Phytophthora; Seringueira. |
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Thesaurus NAL: |
chemical control; disease control; fungicides. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/54569/1/comunicado-tecnico-47-ano-1985.pdf
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Marc: |
LEADER 01734nam a2200421 a 4500
001 1665382
005 2013-08-23
008 1985 bl uuuu u0uu1 u #d
022 $a0101-2118
100 1 $aPEREIRA, J. C. R.
245 $aAvaliacao de fungicidas no controle ao cancro estriado do painel de sangria da seringueira.
260 $aManaus: EMBRAPA-CNPSD$c1985
300 $a5p.
490 $a(EMBRAPA-CNPSD. Comunicado Tecnico, 47).
520 $aCom o objetivo de selecionar produtos efetivos contra o cancro estriado, foram conduzidos dois ensaios; no primeiro, procurou-se avaliar o efeito preventivo e no segundo, o efeito curativo. Foram testados os seguintes produtos: Mancozeb, Clorotalonile metalaxil-Mancozeb, Metalaxil e Captafol utilizado como padrao. Dentre os seis fungicidas testados, os produtos a base de Metalaxil, Ridomil e Ridomil-Mancozeb apresentaram bom desempenho no controle de Phytophthora spp., evidenciando os efeitos preventivo e curativo desses produtos. Com base nesses resultados, o Metalaxil-Mancozeb pode ser indicado como alternativa para o controle do cancro estriado.
650 $achemical control
650 $adisease control
650 $afungicides
650 $aCancro Estriado
650 $aControle Químico
650 $aDoença
650 $aEspécie
650 $aFungicida
650 $aFungo
650 $aHevea
650 $aHevea Brasiliensis
650 $aPhytophthora
650 $aSeringueira
653 $aBahia
653 $aBrasil
653 $aControle de doenca
653 $aFungal diseases
653 $aFungicides evaluation
653 $aPainel
653 $aPanel
653 $aRubber tree
653 $aSpecies
700 1 $aSANTOS, A. F. dos
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Embrapa Amazônia Ocidental (CPAA) |
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