Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strength

Detalhes bibliográficos
Autor(a) principal: Soudais, P. R. N.
Data de Publicação: 2018
Outros Autores: Camacho, J. S., Parsekian, G. A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/s1983-41952018000300011
http://hdl.handle.net/11449/158007
Resumo: Abstract Cellular concrete is a lightweight concrete obtained by aerating agent, which produces air-voids into the mixture. This work deals with bond between cellular concrete and steel rebars. Pull-out tests of 4,2 mm diameter rebars partly immersed into concrete cylinders were made. Concrete unit weight variation and setting of a transverse rebar into the concrete cylinder center constitute the variables of the work. Three types of mixture were prepared: one without aerating agent (with a dry unit weight of 2255 kg/m3), and two with different aerating agent rates (with a dry unit weight equal to 1565 and 1510 kg/m3). The study revealed the large decrease of bond stress between 4,2 diameter rebars and cellular concrete, due to concrete unit weight reduction. Transverse rebar introduced into concrete cylinder center increased the ultimate pull-out force of the test: the gain of bond produced by the transverse rebar grew up when the cellular concrete unit weight had been reduced. Therefore, special anchorages (not exclusively straight), permitting bond improvement between cellular concrete and rebars could be a solution to improve the mechanical performance of cellular concrete.
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spelling Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strengthInfluência do uso de barras transversais soldadas na aderência aço-concreto celular de baixíssima resistência à compressãocellular concretebond stressanchoring.concreto celularaderênciaancoragemAbstract Cellular concrete is a lightweight concrete obtained by aerating agent, which produces air-voids into the mixture. This work deals with bond between cellular concrete and steel rebars. Pull-out tests of 4,2 mm diameter rebars partly immersed into concrete cylinders were made. Concrete unit weight variation and setting of a transverse rebar into the concrete cylinder center constitute the variables of the work. Three types of mixture were prepared: one without aerating agent (with a dry unit weight of 2255 kg/m3), and two with different aerating agent rates (with a dry unit weight equal to 1565 and 1510 kg/m3). The study revealed the large decrease of bond stress between 4,2 diameter rebars and cellular concrete, due to concrete unit weight reduction. Transverse rebar introduced into concrete cylinder center increased the ultimate pull-out force of the test: the gain of bond produced by the transverse rebar grew up when the cellular concrete unit weight had been reduced. Therefore, special anchorages (not exclusively straight), permitting bond improvement between cellular concrete and rebars could be a solution to improve the mechanical performance of cellular concrete.Resumo O concreto celular, que se caracteriza por ter um peso próprio reduzido pela incorporação artificial de ar, pode constituir uma alternativa sustentável ao concreto comum nas estruturas de pequeno e médio porte. O presente trabalho trata da avaliação da aderência entre o concreto celular e as barras de aço. Foram realizados ensaios de arrancamento com barras de diâmetro igual a 4,2 mm, parcialmente imersas em corpos-de-prova cilíndricos de concreto. A taxa de agente espumígeno no concreto e a presença ou não de uma barra transversal dentro do cilindro, simulando uma condição mais próxima ao uso de tela de aço, constituem as variáveis da pesquisa. Foram utilizadas três dosagens de concreto, com massa específica aparente de 2255, 1565 e 1510 kg/m3. Pelo arrancamento de barras simples de diâmetro igual a 4,2 mm, notou-se o forte decréscimo da tensão de aderência junto com o rebaixamento da massa específica aparente do concreto. A barra transversal permitiu obter um ganho de resistência ao arrancamento da barra longitudinal, que cresceu junto com o rebaixamento da massa específica do concreto celular. Assim, a utilização de ancoragens especiais (não exclusivamente retas), pode se tornar uma solução para melhorar o desempenho mecânico do concreto celular.Universidade Estadual Paulista Faculdade de Engenharia Departamento de Engenharia CivilUniversidade Federal de São Carlos Departamento de Engenharia CivilUniversidade Estadual Paulista Faculdade de Engenharia Departamento de Engenharia CivilIBRACON - Instituto Brasileiro do ConcretoUniversidade Estadual Paulista (Unesp)Universidade Federal de São Carlos Departamento de Engenharia CivilSoudais, P. R. N.Camacho, J. S.Parsekian, G. A.2018-11-12T17:27:55Z2018-11-12T17:27:55Z2018-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article620-643application/pdfhttp://dx.doi.org/10.1590/s1983-41952018000300011Revista IBRACON de Estruturas e Materiais. IBRACON - Instituto Brasileiro do Concreto, v. 11, n. 3, p. 620-643, 2018.1983-4195http://hdl.handle.net/11449/15800710.1590/s1983-41952018000300011S1983-41952018000300620S1983-41952018000300620.pdfSciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengRevista IBRACON de Estruturas e Materiaisinfo:eu-repo/semantics/openAccess2024-01-29T06:29:47Zoai:repositorio.unesp.br:11449/158007Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-01-29T06:29:47Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strength
Influência do uso de barras transversais soldadas na aderência aço-concreto celular de baixíssima resistência à compressão
title Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strength
spellingShingle Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strength
Soudais, P. R. N.
cellular concrete
bond stress
anchoring.
concreto celular
aderência
ancoragem
title_short Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strength
title_full Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strength
title_fullStr Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strength
title_full_unstemmed Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strength
title_sort Influence of transverse rebars on bond between steel reinforcement and cellular concrete with very low compressive strength
author Soudais, P. R. N.
author_facet Soudais, P. R. N.
Camacho, J. S.
Parsekian, G. A.
author_role author
author2 Camacho, J. S.
Parsekian, G. A.
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Universidade Federal de São Carlos Departamento de Engenharia Civil
dc.contributor.author.fl_str_mv Soudais, P. R. N.
Camacho, J. S.
Parsekian, G. A.
dc.subject.por.fl_str_mv cellular concrete
bond stress
anchoring.
concreto celular
aderência
ancoragem
topic cellular concrete
bond stress
anchoring.
concreto celular
aderência
ancoragem
description Abstract Cellular concrete is a lightweight concrete obtained by aerating agent, which produces air-voids into the mixture. This work deals with bond between cellular concrete and steel rebars. Pull-out tests of 4,2 mm diameter rebars partly immersed into concrete cylinders were made. Concrete unit weight variation and setting of a transverse rebar into the concrete cylinder center constitute the variables of the work. Three types of mixture were prepared: one without aerating agent (with a dry unit weight of 2255 kg/m3), and two with different aerating agent rates (with a dry unit weight equal to 1565 and 1510 kg/m3). The study revealed the large decrease of bond stress between 4,2 diameter rebars and cellular concrete, due to concrete unit weight reduction. Transverse rebar introduced into concrete cylinder center increased the ultimate pull-out force of the test: the gain of bond produced by the transverse rebar grew up when the cellular concrete unit weight had been reduced. Therefore, special anchorages (not exclusively straight), permitting bond improvement between cellular concrete and rebars could be a solution to improve the mechanical performance of cellular concrete.
publishDate 2018
dc.date.none.fl_str_mv 2018-11-12T17:27:55Z
2018-11-12T17:27:55Z
2018-05-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/s1983-41952018000300011
Revista IBRACON de Estruturas e Materiais. IBRACON - Instituto Brasileiro do Concreto, v. 11, n. 3, p. 620-643, 2018.
1983-4195
http://hdl.handle.net/11449/158007
10.1590/s1983-41952018000300011
S1983-41952018000300620
S1983-41952018000300620.pdf
url http://dx.doi.org/10.1590/s1983-41952018000300011
http://hdl.handle.net/11449/158007
identifier_str_mv Revista IBRACON de Estruturas e Materiais. IBRACON - Instituto Brasileiro do Concreto, v. 11, n. 3, p. 620-643, 2018.
1983-4195
10.1590/s1983-41952018000300011
S1983-41952018000300620
S1983-41952018000300620.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Revista IBRACON de Estruturas e Materiais
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 620-643
application/pdf
dc.publisher.none.fl_str_mv IBRACON - Instituto Brasileiro do Concreto
publisher.none.fl_str_mv IBRACON - Instituto Brasileiro do Concreto
dc.source.none.fl_str_mv SciELO
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1797790430589353984

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