Microconcreto de alto desempenho com fibras de polipropileno
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/9033 |
Resumo: | The microconcrete can be defined as a specific type of concrete in which the presence of small aggregates is predominant and can be used in light prefabrication, that is, in thin section structural elements. Thus, this work aims to evaluate the behavior, in the fresh and hardened states, of the high performance microconcrete with the use of polypropylene fibers. To do so, two fiber dimensions were used: a short 12 mm long, usually used to reduce cracking by plastic retraction, and another fiber of 54 mm, which has a structural function, contributing to improve the tensile strength of material. The fiber contents, in relation to the microconcrete volume, were 0.1%, 0.2%, 0.3% and 0.4% for the microfiber, 0.3%, 0.4% and 0, 5% for the macrofiber and for the hybrids, these being composed of 30% microfiber and 70% macrofiber. Part of the cement was replaced by active silica (SA) and fly ash (CV), in proportions of 7.5% for each one. The tests in the fresh state showed that the fibers reduced the workability, being this more accentuated in the microconcretes with addition of microfibres. Fibers contributed to increase fracture energy; this fact has shown that the application of the fibers in cementitious elements is promising in order to inhibit the brittle rupture and to provide ductile behavior to the element. The contents of 0.3% and 0.4% of microfibers presented a marked increase in porosity and, consequently, an increase in carbonation depth. The tests demonstrated that one must advance in researches with the use of hybrid mixtures and composites with contents of up to 0,12% of microfibres. The addition of the PP fibers provided positive mechanical results for additions of up to 0.1% of microfibers and for additions of up to 0.12% of microfibers in the hybrid composites. In terms of durability presented similar results, except for the additions from 0.2% of microfibers that reasonably elevated the carbonation depth. The high performance of the microconcrete was demonstrated by the results of axial compressive strength around 50 MPa, and by the increase of the tenacity provided by the addition of the PP fibers. |
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Cascudo, Oswaldohttp://lattes.cnpq.br/3336749062812376Bacarji, Edgarhttp://lattes.cnpq.br/2385473000869120Cascudo, OswaldoBacarji, EdgarCarasek, HelenaMendes, Marcus Vinícius Araújo da Silvahttp://lattes.cnpq.br/3578385339122331Silva, Reginaldo Virgilio da2018-11-05T14:47:55Z2018-08-31SILVA, R. V. Microconcreto de alto desempenho com fibras de polipropileno. 2018. 118 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2018.http://repositorio.bc.ufg.br/tede/handle/tede/9033ark:/38995/0013000008g44The microconcrete can be defined as a specific type of concrete in which the presence of small aggregates is predominant and can be used in light prefabrication, that is, in thin section structural elements. Thus, this work aims to evaluate the behavior, in the fresh and hardened states, of the high performance microconcrete with the use of polypropylene fibers. To do so, two fiber dimensions were used: a short 12 mm long, usually used to reduce cracking by plastic retraction, and another fiber of 54 mm, which has a structural function, contributing to improve the tensile strength of material. The fiber contents, in relation to the microconcrete volume, were 0.1%, 0.2%, 0.3% and 0.4% for the microfiber, 0.3%, 0.4% and 0, 5% for the macrofiber and for the hybrids, these being composed of 30% microfiber and 70% macrofiber. Part of the cement was replaced by active silica (SA) and fly ash (CV), in proportions of 7.5% for each one. The tests in the fresh state showed that the fibers reduced the workability, being this more accentuated in the microconcretes with addition of microfibres. Fibers contributed to increase fracture energy; this fact has shown that the application of the fibers in cementitious elements is promising in order to inhibit the brittle rupture and to provide ductile behavior to the element. The contents of 0.3% and 0.4% of microfibers presented a marked increase in porosity and, consequently, an increase in carbonation depth. The tests demonstrated that one must advance in researches with the use of hybrid mixtures and composites with contents of up to 0,12% of microfibres. The addition of the PP fibers provided positive mechanical results for additions of up to 0.1% of microfibers and for additions of up to 0.12% of microfibers in the hybrid composites. In terms of durability presented similar results, except for the additions from 0.2% of microfibers that reasonably elevated the carbonation depth. The high performance of the microconcrete was demonstrated by the results of axial compressive strength around 50 MPa, and by the increase of the tenacity provided by the addition of the PP fibers.O microconcreto pode ser definido como um tipo específico de concreto em que é predominante a presença de agregados miúdos, podendo ser utilizado na pré-fabricação leve, ou seja, em elementos estruturais de seção delgada. Assim, este trabalho tem como objetivo avaliar o comportamento, nos estados fresco e endurecido, do microconcreto de alto desempenho com o uso de fibras de polipropileno. Para tanto, foram usadas duas dimensões de fibras: uma curta com 12 milímetros de comprimento, que usualmente é utilizada para se reduzir a fissuração por retração plástica, e outra fibra de 54 milímetros, que tem função estrutural, contribuindo para melhorar a resistência à tração do material. Os teores de fibras, em relação ao volume do microconcreto, foram de 0,1%, 0,2%, 0,3% e 0,4% para a microfibra, de 0,3%, 0,4% e 0,5% para a macrofibra e para os híbridos, sendo esses compostos por 30% de microfibra e 70% de macrofibra. Parte do cimento foi substituído por sílica ativa (SA) e cinza volante (CV), nas proporções de 7,5% para cada uma delas. Os ensaios no estado fresco demonstraram que as fibras reduziram a trabalhabilidade, sendo essa mais acentuada nos microconcretos com adição de microfibras. As fibras contribuíram para aumentar a energia de fratura; esse fato demonstrou que é promissora a aplicação das fibras em elementos cimentícios, de forma a inibir a ruptura frágil e proporcionar comportamento dúctil ao elemento. Os teores de 0,3% e 0,4% de microfibras apresentaram um aumento acentuado da porosidade e por consequência, um aumento da profundidade de carbonatação. Os ensaios demonstraram que se deve avançar em pesquisas com o uso de misturas híbridas e compostas com teores de até 0,12% de microfibras. A adição das fibras de PP, proporcionou resultados mecânicos positivos para as adições de até 0,1% de microfibras e para adições de até 0,12% de microfibras nos compósitos híbridos. No quesito de durabilidade apresentaram resultados similares, com exceção das adições a partir de 0,2% de microfibras que elevaram razoavelmente a profundidade de carbonatação. O alto desempenho do microconcreto ficou demonstrado pelos resultados de resistência à compressão axial em torno de 50 MPa, e pela elevação da tenacidade proporcionada pela adição das fibras de PP.Submitted by Franciele Moreira (francielemoreyra@gmail.com) on 2018-11-05T13:15:57Z No. of bitstreams: 2 Dissertação - Reginaldo Virgilio da Silva - 2018.pdf: 5205645 bytes, checksum: 571de5e829e85e8d859818a5cad9cc83 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-11-05T14:47:54Z (GMT) No. of bitstreams: 2 Dissertação - Reginaldo Virgilio da Silva - 2018.pdf: 5205645 bytes, checksum: 571de5e829e85e8d859818a5cad9cc83 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2018-11-05T14:47:55Z (GMT). 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dc.title.eng.fl_str_mv |
Microconcreto de alto desempenho com fibras de polipropileno |
dc.title.alternative.eng.fl_str_mv |
High performance microconcrete with polypropylene fibers |
title |
Microconcreto de alto desempenho com fibras de polipropileno |
spellingShingle |
Microconcreto de alto desempenho com fibras de polipropileno Silva, Reginaldo Virgilio da Microconcreto Fibras de polipropileno Sílica ativa Cinza volante Comportamento dúctil Energia de fratura Durabilidade Microconcrete Durability Active silica Fly ash Ductile behavior Fracture energy Polypropylene fiber ENGENHARIA CIVIL::CONSTRUCAO CIVIL |
title_short |
Microconcreto de alto desempenho com fibras de polipropileno |
title_full |
Microconcreto de alto desempenho com fibras de polipropileno |
title_fullStr |
Microconcreto de alto desempenho com fibras de polipropileno |
title_full_unstemmed |
Microconcreto de alto desempenho com fibras de polipropileno |
title_sort |
Microconcreto de alto desempenho com fibras de polipropileno |
author |
Silva, Reginaldo Virgilio da |
author_facet |
Silva, Reginaldo Virgilio da |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Cascudo, Oswaldo |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/3336749062812376 |
dc.contributor.advisor-co1.fl_str_mv |
Bacarji, Edgar |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/2385473000869120 |
dc.contributor.referee1.fl_str_mv |
Cascudo, Oswaldo |
dc.contributor.referee2.fl_str_mv |
Bacarji, Edgar |
dc.contributor.referee3.fl_str_mv |
Carasek, Helena |
dc.contributor.referee4.fl_str_mv |
Mendes, Marcus Vinícius Araújo da Silva |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/3578385339122331 |
dc.contributor.author.fl_str_mv |
Silva, Reginaldo Virgilio da |
contributor_str_mv |
Cascudo, Oswaldo Bacarji, Edgar Cascudo, Oswaldo Bacarji, Edgar Carasek, Helena Mendes, Marcus Vinícius Araújo da Silva |
dc.subject.por.fl_str_mv |
Microconcreto Fibras de polipropileno Sílica ativa Cinza volante Comportamento dúctil Energia de fratura Durabilidade |
topic |
Microconcreto Fibras de polipropileno Sílica ativa Cinza volante Comportamento dúctil Energia de fratura Durabilidade Microconcrete Durability Active silica Fly ash Ductile behavior Fracture energy Polypropylene fiber ENGENHARIA CIVIL::CONSTRUCAO CIVIL |
dc.subject.eng.fl_str_mv |
Microconcrete Durability Active silica Fly ash Ductile behavior Fracture energy Polypropylene fiber |
dc.subject.cnpq.fl_str_mv |
ENGENHARIA CIVIL::CONSTRUCAO CIVIL |
description |
The microconcrete can be defined as a specific type of concrete in which the presence of small aggregates is predominant and can be used in light prefabrication, that is, in thin section structural elements. Thus, this work aims to evaluate the behavior, in the fresh and hardened states, of the high performance microconcrete with the use of polypropylene fibers. To do so, two fiber dimensions were used: a short 12 mm long, usually used to reduce cracking by plastic retraction, and another fiber of 54 mm, which has a structural function, contributing to improve the tensile strength of material. The fiber contents, in relation to the microconcrete volume, were 0.1%, 0.2%, 0.3% and 0.4% for the microfiber, 0.3%, 0.4% and 0, 5% for the macrofiber and for the hybrids, these being composed of 30% microfiber and 70% macrofiber. Part of the cement was replaced by active silica (SA) and fly ash (CV), in proportions of 7.5% for each one. The tests in the fresh state showed that the fibers reduced the workability, being this more accentuated in the microconcretes with addition of microfibres. Fibers contributed to increase fracture energy; this fact has shown that the application of the fibers in cementitious elements is promising in order to inhibit the brittle rupture and to provide ductile behavior to the element. The contents of 0.3% and 0.4% of microfibers presented a marked increase in porosity and, consequently, an increase in carbonation depth. The tests demonstrated that one must advance in researches with the use of hybrid mixtures and composites with contents of up to 0,12% of microfibres. The addition of the PP fibers provided positive mechanical results for additions of up to 0.1% of microfibers and for additions of up to 0.12% of microfibers in the hybrid composites. In terms of durability presented similar results, except for the additions from 0.2% of microfibers that reasonably elevated the carbonation depth. The high performance of the microconcrete was demonstrated by the results of axial compressive strength around 50 MPa, and by the increase of the tenacity provided by the addition of the PP fibers. |
publishDate |
2018 |
dc.date.accessioned.fl_str_mv |
2018-11-05T14:47:55Z |
dc.date.issued.fl_str_mv |
2018-08-31 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SILVA, R. V. Microconcreto de alto desempenho com fibras de polipropileno. 2018. 118 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2018. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/9033 |
dc.identifier.dark.fl_str_mv |
ark:/38995/0013000008g44 |
identifier_str_mv |
SILVA, R. V. Microconcreto de alto desempenho com fibras de polipropileno. 2018. 118 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2018. ark:/38995/0013000008g44 |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/9033 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
6915322422128222104 |
dc.relation.confidence.fl_str_mv |
600 600 600 |
dc.relation.department.fl_str_mv |
724087251626315585 |
dc.relation.cnpq.fl_str_mv |
-2538089779098232013 |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.publisher.program.fl_str_mv |
Programa de Pós-graduação em Geotecnia, Estruturas e Construção Civil (EEC) |
dc.publisher.initials.fl_str_mv |
UFG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Escola de Engenharia Civil - EEC (RG) |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFG instname:Universidade Federal de Goiás (UFG) instacron:UFG |
instname_str |
Universidade Federal de Goiás (UFG) |
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UFG |
institution |
UFG |
reponame_str |
Repositório Institucional da UFG |
collection |
Repositório Institucional da UFG |
bitstream.url.fl_str_mv |
http://repositorio.bc.ufg.br/tede/bitstreams/a9fe4ec4-dec0-42c3-8dcf-8df9cfecf9ab/download http://repositorio.bc.ufg.br/tede/bitstreams/23e89042-6f3b-40ca-8d8a-a9ebca37f8f6/download http://repositorio.bc.ufg.br/tede/bitstreams/ca54bd20-77f7-40ec-8014-4fd2348532de/download http://repositorio.bc.ufg.br/tede/bitstreams/cc36263f-4b67-4db9-8e9b-9186572afdd2/download http://repositorio.bc.ufg.br/tede/bitstreams/99e9da18-ff3f-4461-af0d-e38bb30aca82/download |
bitstream.checksum.fl_str_mv |
bd3efa91386c1718a7f26a329fdcb468 4afdbb8c545fd630ea7db775da747b2f d41d8cd98f00b204e9800998ecf8427e d41d8cd98f00b204e9800998ecf8427e 571de5e829e85e8d859818a5cad9cc83 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFG - Universidade Federal de Goiás (UFG) |
repository.mail.fl_str_mv |
tasesdissertacoes.bc@ufg.br |
_version_ |
1811721450883645440 |