Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Tipo de documento: | Tese |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/29583 |
Resumo: | The extrusion process has been gaining prominence in the production of fiber cement. This process presents several advantages in the production line compared to the conventional process, such as: fiber orientation, lower water / cement ratio, lower implantation cost and good mechanical performance of the composites. However, due to the compaction that occurs during the process, the composites generated are denser when compared to the composites produced by other processes. The objectives of this study were to produce, characterize and evaluate the behavior of extruded cementitious composites with different concentrations of hydrated superabsorbent polymer (SAP) and commercial air-entraining. Cement composites were produced with Portland cement CPV-ARI, limestone, SAP, hydroxypropyl methylcellulose (HPMC) and polyether carboxylic acid (ADVA 175). Cement composites with different SAP concentrations (0.5, 1.0, 1.5, and 2.0%) were produced and evaluated after 28 days of curing and after 30 cycles of accelerated aging. The same cementitious matrix SAP, Darafill 300 EXP air incorporator, Drycast air incorporator, brown Kraft pulp of Eucalyptus spp., HPMC and ADVA 175 were used for the production of the fiber cement. The fiber cements with different concentrations of SAP (0.3, 0.5 and 0.7%), Darafill (0.6, 0.8 and 1.2%) and Drycast (0.6 and 1.2%) were evaluated after 28 days of cure. SAP was efficient in the incorporation of air in cementitious composites without reinforcement and in fiber cement, however, there was formation of millimetric voids, substantially reducing the mechanical performance of the materials. After accelerated aging, all non-reinforced composites showed equivalent reduction in mechanical performance. The fiber cement, despite the degradation of the fibers, were more resistant to the aging cycles. The surfactants did not incorporate air in the cements as expected, however, due to the increased wettability, there was an effective hydration of the dry cement grains, which resulted in higher mechanical performance, higher density, lower porosity and lower voids in the interior of the cementitious matrix. In general, fiber cements with SAP are less dense and presented lower mechanical performance in comparison with the control fiber cement, which restricts their application to non-structural materials. However, the use of surfactants, although it does not incorporate air in the cements, may be interesting, due to the increase in the mechanical performance in extruded fiber cement. |
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Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulpInfluência de diferentes aditivos nas propriedades de compósitos a base de cimento reforçados com polpa kraft de eucaliptoFibrocimentoExtrusãoPolímero superabsorventeSurfactantesEnvelhecimento aceleradoCompósitos extrusados de fibrocimentoIncorporadores de arFiber cementExtrusionSuperabsorvent polymerSurfactantsAccelerated agingExtruded fiber-cement compositesAir incorporatorsMateriais Conjugados não MetálicosThe extrusion process has been gaining prominence in the production of fiber cement. This process presents several advantages in the production line compared to the conventional process, such as: fiber orientation, lower water / cement ratio, lower implantation cost and good mechanical performance of the composites. However, due to the compaction that occurs during the process, the composites generated are denser when compared to the composites produced by other processes. The objectives of this study were to produce, characterize and evaluate the behavior of extruded cementitious composites with different concentrations of hydrated superabsorbent polymer (SAP) and commercial air-entraining. Cement composites were produced with Portland cement CPV-ARI, limestone, SAP, hydroxypropyl methylcellulose (HPMC) and polyether carboxylic acid (ADVA 175). Cement composites with different SAP concentrations (0.5, 1.0, 1.5, and 2.0%) were produced and evaluated after 28 days of curing and after 30 cycles of accelerated aging. The same cementitious matrix SAP, Darafill 300 EXP air incorporator, Drycast air incorporator, brown Kraft pulp of Eucalyptus spp., HPMC and ADVA 175 were used for the production of the fiber cement. The fiber cements with different concentrations of SAP (0.3, 0.5 and 0.7%), Darafill (0.6, 0.8 and 1.2%) and Drycast (0.6 and 1.2%) were evaluated after 28 days of cure. SAP was efficient in the incorporation of air in cementitious composites without reinforcement and in fiber cement, however, there was formation of millimetric voids, substantially reducing the mechanical performance of the materials. After accelerated aging, all non-reinforced composites showed equivalent reduction in mechanical performance. The fiber cement, despite the degradation of the fibers, were more resistant to the aging cycles. The surfactants did not incorporate air in the cements as expected, however, due to the increased wettability, there was an effective hydration of the dry cement grains, which resulted in higher mechanical performance, higher density, lower porosity and lower voids in the interior of the cementitious matrix. In general, fiber cements with SAP are less dense and presented lower mechanical performance in comparison with the control fiber cement, which restricts their application to non-structural materials. However, the use of surfactants, although it does not incorporate air in the cements, may be interesting, due to the increase in the mechanical performance in extruded fiber cement.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)O processo de extrusão vem ganhando destaque na produção de fibrocimentos. Esse processo apresenta várias vantagens na linha de produção em comparação ao processo convencional, como: orientação das fibras, menor relação água/cimento, menor custo de implantação e bom desempenho mecânico dos compósitos. No entanto, devido à compactação que ocorre no decorrer do processo, os compósitos gerados são mais densos, quando comparados aos compósitos produzidos por outros processos. Os objetivos deste estudo foram produzir, caracterizar e avaliar o comportamento de compósitos cimentícios extrudados com diferentes concentrações de polímero superabsorvente hidratado (SAP) e incorporadores de ar comerciais. Os compósitos cimentícios foram produzidos com cimento Portland CPV-ARI, calcário, SAP, hidroxipropilmetilcelulose (HPMC) e poliéter carboxílico (ADVA 175). Foram produzidos compósitos cimentícios com diferentes concentrações de SAP (0,5; 1,0; 1,5; e 2,0%) e foram avaliados após 28 dias de cura e após 30 ciclos de envelhecimento acelerado. Para a produção dos fibrocimentos foram utilizados a mesma matriz cimentícia, SAP, incorporador de ar Darafill 300 EXP, incorporador de ar Drycast, polpa Kraft marrom de Eucalyptus spp., HPMC e ADVA 175. Os fibrocimentos com diferentes concentrações de SAP (0,3; 0,5 e 0,7%), de Darafill (0,6; 0,8 e 1,2%) e de Drycast (0,6 e 1,2%) foram avaliados após 28 dias de cura. O SAP foi eficiente quanto a incorporação de ar nos compósitos cimentícios sem reforço e nos fibrocimentos, no entanto, houve formação de vazios milimétricos, diminuindo substancialmente o desempenho mecânico dos materiais. Após o envelhecimento acelerado todos os compósitos sem reforço apresentaram redução equivalente no desempenho mecânico. Os fibrocimentos, apesar da degradação das fibras, apresentaram-se mais resistentes aos ciclos de envelhecimento. Os surfactantes não incorporaram ar nos fibrocimentos, como era esperado, no entanto, devido ao aumento da molhabilidade, houve uma hidratação efetiva dos grãos anidros de cimento, que acarretou em maior desempenho mecânico, maior densidade, menor porosidade e menor número de vazios no interior da matriz cimentícia. No geral, os fibrocimentos com SAP são menos densos e apresentaram menor desempenho mecânico em comparação com os fibrocimentos controle, o que restringe sua aplicação a materiais não estruturais. Já o uso de surfactantes, apesar de não incorporar ar nos fibrocimentos, pode ser interessante, devido ao acréscimo no desempenho mecânico em fibrocimentos extrudados.Universidade Federal de LavrasPrograma de Pós-Graduação em Engenharia de BiomateriaisUFLAbrasilDepartamento de Ciências FlorestaisMendes, Lourival MarinFonseca, Camila SoaresTonoli, Gustavo Henrique DenzinMendes, Lourival MarinDourado, David CardosoFerreira, Saulo RochaMendes, Rafael FarinassiRabelo, Giovanni FranciscoSilva, Danillo Wisky2018-07-09T13:05:58Z2018-07-09T13:05:58Z2018-07-062018-06-18info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfSILVA, D. W. Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp. 2018. 76 p. Tese (Doutorado em Engenharia de Biomateriais)–Universidade Federal de Lavras, Lavras, 2018.http://repositorio.ufla.br/jspui/handle/1/29583enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLA2023-04-25T13:42:45Zoai:localhost:1/29583Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2023-04-25T13:42:45Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp Influência de diferentes aditivos nas propriedades de compósitos a base de cimento reforçados com polpa kraft de eucalipto |
title |
Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp |
spellingShingle |
Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp Silva, Danillo Wisky Fibrocimento Extrusão Polímero superabsorvente Surfactantes Envelhecimento acelerado Compósitos extrusados de fibrocimento Incorporadores de ar Fiber cement Extrusion Superabsorvent polymer Surfactants Accelerated aging Extruded fiber-cement composites Air incorporators Materiais Conjugados não Metálicos |
title_short |
Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp |
title_full |
Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp |
title_fullStr |
Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp |
title_full_unstemmed |
Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp |
title_sort |
Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp |
author |
Silva, Danillo Wisky |
author_facet |
Silva, Danillo Wisky |
author_role |
author |
dc.contributor.none.fl_str_mv |
Mendes, Lourival Marin Fonseca, Camila Soares Tonoli, Gustavo Henrique Denzin Mendes, Lourival Marin Dourado, David Cardoso Ferreira, Saulo Rocha Mendes, Rafael Farinassi Rabelo, Giovanni Francisco |
dc.contributor.author.fl_str_mv |
Silva, Danillo Wisky |
dc.subject.por.fl_str_mv |
Fibrocimento Extrusão Polímero superabsorvente Surfactantes Envelhecimento acelerado Compósitos extrusados de fibrocimento Incorporadores de ar Fiber cement Extrusion Superabsorvent polymer Surfactants Accelerated aging Extruded fiber-cement composites Air incorporators Materiais Conjugados não Metálicos |
topic |
Fibrocimento Extrusão Polímero superabsorvente Surfactantes Envelhecimento acelerado Compósitos extrusados de fibrocimento Incorporadores de ar Fiber cement Extrusion Superabsorvent polymer Surfactants Accelerated aging Extruded fiber-cement composites Air incorporators Materiais Conjugados não Metálicos |
description |
The extrusion process has been gaining prominence in the production of fiber cement. This process presents several advantages in the production line compared to the conventional process, such as: fiber orientation, lower water / cement ratio, lower implantation cost and good mechanical performance of the composites. However, due to the compaction that occurs during the process, the composites generated are denser when compared to the composites produced by other processes. The objectives of this study were to produce, characterize and evaluate the behavior of extruded cementitious composites with different concentrations of hydrated superabsorbent polymer (SAP) and commercial air-entraining. Cement composites were produced with Portland cement CPV-ARI, limestone, SAP, hydroxypropyl methylcellulose (HPMC) and polyether carboxylic acid (ADVA 175). Cement composites with different SAP concentrations (0.5, 1.0, 1.5, and 2.0%) were produced and evaluated after 28 days of curing and after 30 cycles of accelerated aging. The same cementitious matrix SAP, Darafill 300 EXP air incorporator, Drycast air incorporator, brown Kraft pulp of Eucalyptus spp., HPMC and ADVA 175 were used for the production of the fiber cement. The fiber cements with different concentrations of SAP (0.3, 0.5 and 0.7%), Darafill (0.6, 0.8 and 1.2%) and Drycast (0.6 and 1.2%) were evaluated after 28 days of cure. SAP was efficient in the incorporation of air in cementitious composites without reinforcement and in fiber cement, however, there was formation of millimetric voids, substantially reducing the mechanical performance of the materials. After accelerated aging, all non-reinforced composites showed equivalent reduction in mechanical performance. The fiber cement, despite the degradation of the fibers, were more resistant to the aging cycles. The surfactants did not incorporate air in the cements as expected, however, due to the increased wettability, there was an effective hydration of the dry cement grains, which resulted in higher mechanical performance, higher density, lower porosity and lower voids in the interior of the cementitious matrix. In general, fiber cements with SAP are less dense and presented lower mechanical performance in comparison with the control fiber cement, which restricts their application to non-structural materials. However, the use of surfactants, although it does not incorporate air in the cements, may be interesting, due to the increase in the mechanical performance in extruded fiber cement. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-07-09T13:05:58Z 2018-07-09T13:05:58Z 2018-07-06 2018-06-18 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
SILVA, D. W. Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp. 2018. 76 p. Tese (Doutorado em Engenharia de Biomateriais)–Universidade Federal de Lavras, Lavras, 2018. http://repositorio.ufla.br/jspui/handle/1/29583 |
identifier_str_mv |
SILVA, D. W. Influence of different additives on properties of cement based composites reinforced with eucalyptus kraft pulp. 2018. 76 p. Tese (Doutorado em Engenharia de Biomateriais)–Universidade Federal de Lavras, Lavras, 2018. |
url |
http://repositorio.ufla.br/jspui/handle/1/29583 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Lavras Programa de Pós-Graduação em Engenharia de Biomateriais UFLA brasil Departamento de Ciências Florestais |
publisher.none.fl_str_mv |
Universidade Federal de Lavras Programa de Pós-Graduação em Engenharia de Biomateriais UFLA brasil Departamento de Ciências Florestais |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFLA instname:Universidade Federal de Lavras (UFLA) instacron:UFLA |
instname_str |
Universidade Federal de Lavras (UFLA) |
instacron_str |
UFLA |
institution |
UFLA |
reponame_str |
Repositório Institucional da UFLA |
collection |
Repositório Institucional da UFLA |
repository.name.fl_str_mv |
Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA) |
repository.mail.fl_str_mv |
nivaldo@ufla.br || repositorio.biblioteca@ufla.br |
_version_ |
1807835224869961728 |