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Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armado

Bibliographic Details
Main Author: Pereira, Pâmela Christiane de Almeida
Publication Date: 2015
Format: Master thesis
Language: por
Source: Repositório Institucional da UNIPAMPA
Download full: http://dspace.unipampa.edu.br:8080/jspui/handle/riu/784
Summary: The corrosion of concrete reinforcement is considered a major problem in construction, or for the maintenance usually difficult to implement and costly or by serious damage, which can lead to complete ruin of structures. Various techniques have been studied to retard corrosion, among which stands out use of additives for corrosion inhibiting effective. In the present study corrosion inhibitors containing carboxilate and benzoate anions were inserted into reinforced concrete to study the electrochemical behavior related to corrosion of these anions. For this were used techniques of accelerated corrosion by modified immersion (CAIM) and electrochemical impedance spectroscopy (EIS). The profiles of the typical behavior of current versus time curves, as well as impedance measurements indicated a corrosion inhibitor behavior associated with the presence of anions in the concrete. Weight loss analysis confirmed the results achieved by CAIM assay as showed a decrease on weight on reinforced of reinforced concrete when in presence of benzoate or carboxilate anions. Moreover, the presence of the carboxylate and benzoate anions suggests a synergic effect against corrosion. Tests were also conducted to evaluate the influence of the presence of inhibitors in the physical properties of the concrete.
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spelling Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armadoEngenhariaInibidores de corrosãoEstruturas de concretoConcreto armadoEngineeringCorrosion inhibitorsConcrete StructuresReinforced concreteThe corrosion of concrete reinforcement is considered a major problem in construction, or for the maintenance usually difficult to implement and costly or by serious damage, which can lead to complete ruin of structures. Various techniques have been studied to retard corrosion, among which stands out use of additives for corrosion inhibiting effective. In the present study corrosion inhibitors containing carboxilate and benzoate anions were inserted into reinforced concrete to study the electrochemical behavior related to corrosion of these anions. For this were used techniques of accelerated corrosion by modified immersion (CAIM) and electrochemical impedance spectroscopy (EIS). The profiles of the typical behavior of current versus time curves, as well as impedance measurements indicated a corrosion inhibitor behavior associated with the presence of anions in the concrete. Weight loss analysis confirmed the results achieved by CAIM assay as showed a decrease on weight on reinforced of reinforced concrete when in presence of benzoate or carboxilate anions. Moreover, the presence of the carboxylate and benzoate anions suggests a synergic effect against corrosion. Tests were also conducted to evaluate the influence of the presence of inhibitors in the physical properties of the concrete.A corrosão das armaduras do concreto é considerada um grande problema na construção civil, seja pela manutenção geralmente de difícil execução e custo elevado ou pelos sérios danos causados, podendo conduzir à completa ruína de estruturas. Diversas técnicas têm sido estudadas para retardar a corrosão, dentre elas destaca-se o uso de aditivos inibidores de corrosão pela sua eficácia. No presente estudo inibidores de corrosão contendo os ânions carboxilato e benzoato foram inseridos no concreto armado com o intuito de analisar o comportamento eletroquímico frente à corrosão destes ânions. Para isso utilizaram-se as técnicas de corrosão acelerada por imersão modificada (CAIM) e espectroscopia de impedância eletroquímica (EIE). Os perfis das curvas de comportamento típico da corrente versus tempo, bem como as medidas de impedância indicaram um comportamento inibidor da corrosão associado à presença dos ânions no concreto armado. Análises de perda de massa confirmaram os resultados encontrados a partir do ensaio CAIM à medida que mostraram uma redução na perda de massa da armadura nas misturas dos concretos contendo os ânions benzoato ou carboxilato. Mais ainda, a presença dos ânions carboxilato e benzoato juntos sugere um efeito sinérgico contra a corrosão. Também foram realizados ensaios para avaliar a influência da presença dos inibidores nas propriedades físicas do concreto.Universidade Federal do PampaTamborim, Sílvia Margonei MesquitaPereira, Pâmela Christiane de Almeida2017-01-26T11:29:49Z2017-01-26T11:29:49Z2015-03-30info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfAttribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessporreponame:Repositório Institucional da UNIPAMPAinstname:Universidade Federal do Pampa (UNIPAMPA)instacron:UNIPAMPAhttp://dspace.unipampa.edu.br:8080/jspui/handle/riu/7842018-10-24T13:19:32Zoai:repositorio.unipampa.edu.br:riu/784Repositório InstitucionalPUBhttp://dspace.unipampa.edu.br:8080/oai/requestsisbi@unipampa.edu.bropendoar:2018-10-24T13:19:32Repositório Institucional da UNIPAMPA - Universidade Federal do Pampa (UNIPAMPA)false
dc.title.none.fl_str_mv Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armado
title Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armado
spellingShingle Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armado
Pereira, Pâmela Christiane de Almeida
Engenharia
Inibidores de corrosão
Estruturas de concreto
Concreto armado
Engineering
Corrosion inhibitors
Concrete Structures
Reinforced concrete
title_short Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armado
title_full Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armado
title_fullStr Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armado
title_full_unstemmed Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armado
title_sort Efeito inibidor dos ânions carboxilato na corrosão de estruturas de concreto armado
author Pereira, Pâmela Christiane de Almeida
author_facet Pereira, Pâmela Christiane de Almeida
author_role author
dc.contributor.none.fl_str_mv Tamborim, Sílvia Margonei Mesquita
dc.contributor.author.fl_str_mv Pereira, Pâmela Christiane de Almeida
dc.subject.por.fl_str_mv Engenharia
Inibidores de corrosão
Estruturas de concreto
Concreto armado
Engineering
Corrosion inhibitors
Concrete Structures
Reinforced concrete
topic Engenharia
Inibidores de corrosão
Estruturas de concreto
Concreto armado
Engineering
Corrosion inhibitors
Concrete Structures
Reinforced concrete
description The corrosion of concrete reinforcement is considered a major problem in construction, or for the maintenance usually difficult to implement and costly or by serious damage, which can lead to complete ruin of structures. Various techniques have been studied to retard corrosion, among which stands out use of additives for corrosion inhibiting effective. In the present study corrosion inhibitors containing carboxilate and benzoate anions were inserted into reinforced concrete to study the electrochemical behavior related to corrosion of these anions. For this were used techniques of accelerated corrosion by modified immersion (CAIM) and electrochemical impedance spectroscopy (EIS). The profiles of the typical behavior of current versus time curves, as well as impedance measurements indicated a corrosion inhibitor behavior associated with the presence of anions in the concrete. Weight loss analysis confirmed the results achieved by CAIM assay as showed a decrease on weight on reinforced of reinforced concrete when in presence of benzoate or carboxilate anions. Moreover, the presence of the carboxylate and benzoate anions suggests a synergic effect against corrosion. Tests were also conducted to evaluate the influence of the presence of inhibitors in the physical properties of the concrete.
publishDate 2015
dc.date.none.fl_str_mv 2015-03-30
2017-01-26T11:29:49Z
2017-01-26T11:29:49Z
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.uri.fl_str_mv http://dspace.unipampa.edu.br:8080/jspui/handle/riu/784
url http://dspace.unipampa.edu.br:8080/jspui/handle/riu/784
dc.language.iso.fl_str_mv por
language por
dc.rights.driver.fl_str_mv Attribution-NonCommercial-NoDerivs 3.0 Brazil
http://creativecommons.org/licenses/by-nc-nd/3.0/br/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivs 3.0 Brazil
http://creativecommons.org/licenses/by-nc-nd/3.0/br/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal do Pampa
publisher.none.fl_str_mv Universidade Federal do Pampa
dc.source.none.fl_str_mv reponame:Repositório Institucional da UNIPAMPA
instname:Universidade Federal do Pampa (UNIPAMPA)
instacron:UNIPAMPA
instname_str Universidade Federal do Pampa (UNIPAMPA)
instacron_str UNIPAMPA
institution UNIPAMPA
reponame_str Repositório Institucional da UNIPAMPA
collection Repositório Institucional da UNIPAMPA
repository.name.fl_str_mv Repositório Institucional da UNIPAMPA - Universidade Federal do Pampa (UNIPAMPA)
repository.mail.fl_str_mv sisbi@unipampa.edu.br
_version_ 1842255687527170048

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