EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS

Detalhes bibliográficos
Autor(a) principal: Duart, Marcelo Adriano
Data de Publicação: 2017
Tipo de documento: Tese
Idioma: por
Título da fonte: Repositório Institucional Universidade Franciscana
Texto Completo: http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/702
Resumo: Civil construction industry has been developing technologically with the growth in the number of works in various sectors such as housing, transport, industry and infrastructure. This study is intended to contribute to the development of scientific cementitious materials by studying the use of carbon nanomaterials as carbon nanotubes (CNT) and nanoparticles of Hydrated Calcium Silicate (C-S-H) incorporated into the matrix of these materials, which can be categorized as composite, in this case nanocomposites. Materials performance is usually related to the existence of considerable flaws or deficiencies in some properties or characteristics. The incorporation of nanomaterials is a possibility for the amelioration or even create some characteristic and materials property. The use of CNT has already been investigated and the results have shown that though with increase of costs produced materials have positive characteristics such compression and tensile resistance increase and still elasticity modulus increase. Currently steel is used but the fibers and filler materials such as CNT may be an alternative because they can have tensile strength up to 100 times higher than steel, as recent research has shown. The main assumption is that nanoparticles such as C-S-H and oxidized multi walled carbon nanotubes (MWCNT-OX) favor the kinetics of cement hydration and contribute to the nucleation and crystal growth enhancing material characteristics produced as concrete and mortar, for example. In general, it was verified that the combined additions of C-S-H with Ca / Si = 0.8 ratio with nanotubes brought positive results of nanocomposite nanostructure improvements, verified by porosity, permeability analysis and qualitative analysis of electron microscopy images. An increase in the value of the mechanical properties analyzed was shown as a 33% increase in compressive strength, 38% increase in modulus of elasticity and 30% in tensile strength. It is also concluded that using the C-S-H addition with Ca/Si ratio = 0.8 in isolation is a viable alternative to produce relevant results with a lower cost than to opt for mixed additions, since CNT are still materials with high cost and more complex production than C-S-H.
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spelling Mortari, Sérgio RobertoRodrigus, Oscar Endrigo DornelesPinheiro, Marco Antonio SilvaMachado, Fernando MachadoBulhões, Luis Otávio de SousaViezzer, ChristianDuart, Marcelo Adriano2018-11-01T20:55:14Z2017-07-31Duart, Marcelo Adriano. EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS. 2017.125f. Tese( Programa de Pós-Graduação em Nanociências) - Centro Universitário Franciscano, Santa Maria - RS .http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/702Civil construction industry has been developing technologically with the growth in the number of works in various sectors such as housing, transport, industry and infrastructure. This study is intended to contribute to the development of scientific cementitious materials by studying the use of carbon nanomaterials as carbon nanotubes (CNT) and nanoparticles of Hydrated Calcium Silicate (C-S-H) incorporated into the matrix of these materials, which can be categorized as composite, in this case nanocomposites. Materials performance is usually related to the existence of considerable flaws or deficiencies in some properties or characteristics. The incorporation of nanomaterials is a possibility for the amelioration or even create some characteristic and materials property. The use of CNT has already been investigated and the results have shown that though with increase of costs produced materials have positive characteristics such compression and tensile resistance increase and still elasticity modulus increase. Currently steel is used but the fibers and filler materials such as CNT may be an alternative because they can have tensile strength up to 100 times higher than steel, as recent research has shown. The main assumption is that nanoparticles such as C-S-H and oxidized multi walled carbon nanotubes (MWCNT-OX) favor the kinetics of cement hydration and contribute to the nucleation and crystal growth enhancing material characteristics produced as concrete and mortar, for example. In general, it was verified that the combined additions of C-S-H with Ca / Si = 0.8 ratio with nanotubes brought positive results of nanocomposite nanostructure improvements, verified by porosity, permeability analysis and qualitative analysis of electron microscopy images. An increase in the value of the mechanical properties analyzed was shown as a 33% increase in compressive strength, 38% increase in modulus of elasticity and 30% in tensile strength. It is also concluded that using the C-S-H addition with Ca/Si ratio = 0.8 in isolation is a viable alternative to produce relevant results with a lower cost than to opt for mixed additions, since CNT are still materials with high cost and more complex production than C-S-H.A construção civil vem se desenvolvendo tecnologicamente acompanhando o crescimento do número de obras em vários setores como habitacional, transportes, industrial e infraestrutura. Este projeto pretende contribuir cientificamente para o desenvolvimento de materiais cimentícios através do estudo da utilização de nanomateriais de carbono como nanotubos de carbono (NTC) e também nanopartículas de Silicato de Cálcio Hidratado (C-S-H) incorporadas à matriz destes materiais, que podem ser classificados como compósitos, neste caso nanocompósitos. O desempenho dos materias normalmente está relacionado a existência de falhas ou deficiências consideráveis em algumas propriedades e caracteristicas. A incorporação de nanomateriais é uma possibilidade para o melhoramento ou até mesmo a criação de alguma característica ou propriedade em determinados materiais. A utilização de NTC já vem sendo pesquisada e os resultados têm demonstrado que, embora com elevação dos custos, os materiais produzidos apresentam características positivas como: aumento da resistência à compressão e flexão e também do módulo de elasticidade. Atualmente usa-se o aço e fibras mas a adição de materiais como NTC pode ser uma alternativa, pois estes podem apresentar resistência à tração até 100 vezes maior que o aço, conforme pesquisas recentes já demonstram. A hipótese principal é que nanopartículas de C-S-H e também NTC favorecem a cinética de hidratação de cimentos e contribuem para a nucleação e crescimentos de cristais de produtos hidratados melhorando características dos materiais produzidos como por exemplo: concretos e argamassas. De forma geral, verificou-se que as adições combinadas de C-S-H com relação Ca/Si=0,8 com nanotubos de carbono paredes múltiplas oxidados (NTCPM-OX) trouxeram resultados positivos de melhoria na nanoestrutura dos nanocompósitos produzidos, verificados pela análise da porosidade, permeabilidade e também pela análise qualitativa de imagens de microscopia eletrônica. Veficou-se aumento do valor das propriedades mecânicas analisadas como 33% de aumento da resistência à compressão, 38% de aumento do módulo de elasticidade dinâmico e 30% da resistência à tração. Conclui-se ainda que usar a adição de C-S-H com relação Ca/Si=0,8 de forma isolada é uma alternativa viável produzindo resultados relevantes com um custo mais baixo que optar por adições mistas, visto que ainda os NTC são materiais com custo elevado e produção mais complexa do que o C-S-H.Submitted by MARCIA ROVADOSCHI (marciar@unifra.br) on 2018-11-01T20:55:14Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_MarceloAdrianoDuart.pdf: 8331452 bytes, checksum: d69e28005ad96f39781d95f4cfc7f7fb (MD5)Made available in DSpace on 2018-11-01T20:55:14Z (GMT). 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dc.title.por.fl_str_mv EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS
title EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS
spellingShingle EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS
Duart, Marcelo Adriano
nanotecnologia, nucleação, nanomateriais, C-S-H.
Nanotechnology, nucleation, nanomaterials, C-S-H.
Nanociências
title_short EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS
title_full EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS
title_fullStr EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS
title_full_unstemmed EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS
title_sort EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS
author Duart, Marcelo Adriano
author_facet Duart, Marcelo Adriano
author_role author
dc.contributor.advisor1.fl_str_mv Mortari, Sérgio Roberto
dc.contributor.advisor-co1.fl_str_mv Rodrigus, Oscar Endrigo Dorneles
dc.contributor.referee1.fl_str_mv Pinheiro, Marco Antonio Silva
dc.contributor.referee2.fl_str_mv Machado, Fernando Machado
dc.contributor.referee3.fl_str_mv Bulhões, Luis Otávio de Sousa
dc.contributor.referee4.fl_str_mv Viezzer, Christian
dc.contributor.author.fl_str_mv Duart, Marcelo Adriano
contributor_str_mv Mortari, Sérgio Roberto
Rodrigus, Oscar Endrigo Dorneles
Pinheiro, Marco Antonio Silva
Machado, Fernando Machado
Bulhões, Luis Otávio de Sousa
Viezzer, Christian
dc.subject.por.fl_str_mv nanotecnologia, nucleação, nanomateriais, C-S-H.
topic nanotecnologia, nucleação, nanomateriais, C-S-H.
Nanotechnology, nucleation, nanomaterials, C-S-H.
Nanociências
dc.subject.eng.fl_str_mv Nanotechnology, nucleation, nanomaterials, C-S-H.
dc.subject.cnpq.fl_str_mv Nanociências
description Civil construction industry has been developing technologically with the growth in the number of works in various sectors such as housing, transport, industry and infrastructure. This study is intended to contribute to the development of scientific cementitious materials by studying the use of carbon nanomaterials as carbon nanotubes (CNT) and nanoparticles of Hydrated Calcium Silicate (C-S-H) incorporated into the matrix of these materials, which can be categorized as composite, in this case nanocomposites. Materials performance is usually related to the existence of considerable flaws or deficiencies in some properties or characteristics. The incorporation of nanomaterials is a possibility for the amelioration or even create some characteristic and materials property. The use of CNT has already been investigated and the results have shown that though with increase of costs produced materials have positive characteristics such compression and tensile resistance increase and still elasticity modulus increase. Currently steel is used but the fibers and filler materials such as CNT may be an alternative because they can have tensile strength up to 100 times higher than steel, as recent research has shown. The main assumption is that nanoparticles such as C-S-H and oxidized multi walled carbon nanotubes (MWCNT-OX) favor the kinetics of cement hydration and contribute to the nucleation and crystal growth enhancing material characteristics produced as concrete and mortar, for example. In general, it was verified that the combined additions of C-S-H with Ca / Si = 0.8 ratio with nanotubes brought positive results of nanocomposite nanostructure improvements, verified by porosity, permeability analysis and qualitative analysis of electron microscopy images. An increase in the value of the mechanical properties analyzed was shown as a 33% increase in compressive strength, 38% increase in modulus of elasticity and 30% in tensile strength. It is also concluded that using the C-S-H addition with Ca/Si ratio = 0.8 in isolation is a viable alternative to produce relevant results with a lower cost than to opt for mixed additions, since CNT are still materials with high cost and more complex production than C-S-H.
publishDate 2017
dc.date.issued.fl_str_mv 2017-07-31
dc.date.accessioned.fl_str_mv 2018-11-01T20:55:14Z
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dc.identifier.citation.fl_str_mv Duart, Marcelo Adriano. EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS. 2017.125f. Tese( Programa de Pós-Graduação em Nanociências) - Centro Universitário Franciscano, Santa Maria - RS .
dc.identifier.uri.fl_str_mv http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/702
identifier_str_mv Duart, Marcelo Adriano. EFEITOS DA ADIÇÃO DE NANOTUBOS DE CARBONO E C-S-H PRECIPITADO NAS PROPRIEDADES DE NANOCOMPÓSITOS CIMENTÍCIOS. 2017.125f. Tese( Programa de Pós-Graduação em Nanociências) - Centro Universitário Franciscano, Santa Maria - RS .
url http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/702
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dc.publisher.department.fl_str_mv Biociências e Nanomateriais
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