Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/56030 |
Resumo: | The objective was to investigate the use of residues from the pulping of unbleached kraft pulp (UKP) and quartzite mining, as well as the use of the accelerated carbonation (AC) technique and the addition of air-entraining surfactants. Two stages were carried out, the first with 4 initial treatments, which were the control without AC and the others with different periods of AC of 6, 9 and 12 hours. After carrying out the first stage, 3 treatments were produced, the control and the others with the addition of drycast and Darafill air-entraining surfactant additives, verifying those with and without CA for 9 hours. Fiber cements were characterized according to the physical properties of apparent density (AD), water absorption (AA), apparent porosity (PA) and the mechanical properties of modulus of rupture (MOR), modulus of elasticity (MOE), limit of proportionality (LOP ) and toughness. Thermogravimetry (TG) analyzes were approached in order to monitor the formation of carbonates throughout the accelerated carbonation process and scanning electron microscopy (SEM) to verify the interaction between the constituent materials. As a result of the first stage, there was no significant effect on AD, PA and AA in the fiber cements in relation to the different AC times. There was a tendency for the MOR, MOE and LOP values to decrease as the periods subject to CA increased. There was a significant improvement in the tenacity properties of the fiber cements subjected to longer periods of CA, with a tendency for this property to stabilize between 9 am and 12 pm. Regarding the TG and DTG analyses, it was possible to verify that there was the formation of calcium carbonate due to the CA process, leading to a decrease in the alkalinity of the matrix, which provided a less aggressive environment for the UKP fibers. In this way, it was concluded that the best CA time was 9 hours, being the viable technique to improve the interaction between the matrix and the fiber. Regarding the results of the second stage, the fiber cements with the Drycast additive obtained an increase in the results of AA and PA, and a decrease in DA. They did not show differences in the results of MOR, MOE and LOP, and there was a decrease in toughness. As for the fiber cements with Darafill, there was a decrease in the results of AA and PA with the increase in DA. For the MOE and LOP mechanical properties, no difference was observed in relation to the control. However, there was an increase in toughness and MOR. Regarding AC, there was an increase in the results of MOR, MOE and LOP with the use of the technique, as well as there was no significant interaction between surfactants and AC in the studied fiber cements. In this way, the use of additives is concluded, in the case of Drycast, it enabled the reduction of density and, Darafill, improved the mechanical properties MOR and Tenacity. |
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Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKPAccelerated carbonation in fibercements composed of quartzite residues and fibers UKPCompósitoFibras lignocelulósicasResíduos de mineraçãoSurfactantesCompositeLignocellulosic fibersMining wasteSurfactantsTecnologia de Celulose e PapelThe objective was to investigate the use of residues from the pulping of unbleached kraft pulp (UKP) and quartzite mining, as well as the use of the accelerated carbonation (AC) technique and the addition of air-entraining surfactants. Two stages were carried out, the first with 4 initial treatments, which were the control without AC and the others with different periods of AC of 6, 9 and 12 hours. After carrying out the first stage, 3 treatments were produced, the control and the others with the addition of drycast and Darafill air-entraining surfactant additives, verifying those with and without CA for 9 hours. Fiber cements were characterized according to the physical properties of apparent density (AD), water absorption (AA), apparent porosity (PA) and the mechanical properties of modulus of rupture (MOR), modulus of elasticity (MOE), limit of proportionality (LOP ) and toughness. Thermogravimetry (TG) analyzes were approached in order to monitor the formation of carbonates throughout the accelerated carbonation process and scanning electron microscopy (SEM) to verify the interaction between the constituent materials. As a result of the first stage, there was no significant effect on AD, PA and AA in the fiber cements in relation to the different AC times. There was a tendency for the MOR, MOE and LOP values to decrease as the periods subject to CA increased. There was a significant improvement in the tenacity properties of the fiber cements subjected to longer periods of CA, with a tendency for this property to stabilize between 9 am and 12 pm. Regarding the TG and DTG analyses, it was possible to verify that there was the formation of calcium carbonate due to the CA process, leading to a decrease in the alkalinity of the matrix, which provided a less aggressive environment for the UKP fibers. In this way, it was concluded that the best CA time was 9 hours, being the viable technique to improve the interaction between the matrix and the fiber. Regarding the results of the second stage, the fiber cements with the Drycast additive obtained an increase in the results of AA and PA, and a decrease in DA. They did not show differences in the results of MOR, MOE and LOP, and there was a decrease in toughness. As for the fiber cements with Darafill, there was a decrease in the results of AA and PA with the increase in DA. For the MOE and LOP mechanical properties, no difference was observed in relation to the control. However, there was an increase in toughness and MOR. Regarding AC, there was an increase in the results of MOR, MOE and LOP with the use of the technique, as well as there was no significant interaction between surfactants and AC in the studied fiber cements. In this way, the use of additives is concluded, in the case of Drycast, it enabled the reduction of density and, Darafill, improved the mechanical properties MOR and Tenacity.O objetivo foi averiguar o uso de resíduos da polpação da celulose unbleached kraft pulp (UKP) e da mineração do quartzito, como também o emprego da técnica da carbonatação acelerada (CA) e, à adição de surfactantes incorporadores de ar. Foram realizadas duas etapas, sendo a primeira com 4 tratamentos iniciais, os quais foram o controle sem CA e os demais com diferentes períodos de CA de 6, 9 e 12 horas. Após a realização da primeira etapa foram produzidos 3 tratamentos, o controle e os demais com adição dos aditivos surfactantes incorporadores de ar Drycast e Darafill, averiguando os com e sem a CA por 9 horas. Fibrocimentos foram caracterizados quanto às propriedades físicas de densidade aparente (DA), absorção de água (AA), porosidade aparente (PA) e as propriedades mecânicas de módulo de ruptura (MOR), módulo de elasticidade (MOE), limite de proporcionalidade (LOP) e tenacidade. Foram abordadas as análises de termogravimetria (TG) a fim de monitorar a formação de carbonatos ao longo do processo de carbonatação acelerada e a microscopia eletrônica de varredura (MEV) para verificar a interação entre os materiais constituintes. Como resultados da primeira etapa, não houve efeito significativo sobre a DA, a PA e a AA nos fibrocimentos em relação aos diferentes tempos de CA. Houve uma tendência de redução dos valores de MOR, MOE e LOP à medida que se aumentavam os períodos sujeitos a CA. Houve melhoria significativa para as propriedades de tenacidade para os fibrocimentos submetidos a maiores períodos de CA, com tendência à estabilização desta propriedade entre 9 horas e 12 horas. Em relação as análises de TG e DTG, foi possível verificar que houve a formação de carbonato de cálcio devido ao processo da CA, levando à diminuição da alcalinidade da matriz, o que proporcionou um ambiente menos agressivo para as fibras UKP. Desta forma, concluiu-se, que o melhor tempo de CA foi de 9 horas, sendo a técnica viável para melhorar a interação entre a matriz e a fibra. Em relação aos resultados da segunda etapa, os fibrocimentos com o aditivo Drycast obtiveram aumento nos resultados de AA e PA, e diminuição da DA. Não mostraram diferenças nos resultados de MOR, MOE e LOP, e houve diminuição da tenacidade. Já nos fibrocimentos com Darafill, houve diminuição nos resultados de AA e PA com o aumento da DA. Para as propriedades mecânicas MOE e LOP não foi observada diferença em relação ao controle. No entanto, houve aumento da tenacidade e do MOR. Em relação a CA, houve aumento dos resultados de MOR, MOE e LOP com o uso da técnica, assim como não houve interação significativa entre os surfactantes e a CA nos fibrocimentos estudados. Desta forma, conclui-se o uso dos aditivos, no caso do Drycast, possibilitou a redução da densidade e, o Darafill, melhorou as propriedades mecânicas MOR e Tenacidade.Universidade Federal de LavrasPrograma de Pós-graduação em Engenharia de BiomateriaisUFLAbrasilDepartamento de Ciências FlorestaisMendes, Lourival MarinSilva, Danillo WiskyMendes, Lourival MarinGuimarães Júnior, José BeneditoDias, Marali VilelaPaula, Wisner Coimbra deTeixeira, Júlia NavesTerra, Isabelle Cristine de Carvalho2023-02-17T16:04:18Z2023-02-17T16:04:18Z2023-02-172023-01-26info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfTERRA, I. C. de C. Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP. 2023. 78 p. Tese (Doutorado em Engenharia de Biomateriais)–Universidade Federal de Lavras, Lavras, 2023.http://repositorio.ufla.br/jspui/handle/1/56030porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLA2023-04-25T13:42:44Zoai:localhost:1/56030Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2023-04-25T13:42:44Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP Accelerated carbonation in fibercements composed of quartzite residues and fibers UKP |
title |
Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP |
spellingShingle |
Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP Terra, Isabelle Cristine de Carvalho Compósito Fibras lignocelulósicas Resíduos de mineração Surfactantes Composite Lignocellulosic fibers Mining waste Surfactants Tecnologia de Celulose e Papel |
title_short |
Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP |
title_full |
Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP |
title_fullStr |
Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP |
title_full_unstemmed |
Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP |
title_sort |
Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP |
author |
Terra, Isabelle Cristine de Carvalho |
author_facet |
Terra, Isabelle Cristine de Carvalho |
author_role |
author |
dc.contributor.none.fl_str_mv |
Mendes, Lourival Marin Silva, Danillo Wisky Mendes, Lourival Marin Guimarães Júnior, José Benedito Dias, Marali Vilela Paula, Wisner Coimbra de Teixeira, Júlia Naves |
dc.contributor.author.fl_str_mv |
Terra, Isabelle Cristine de Carvalho |
dc.subject.por.fl_str_mv |
Compósito Fibras lignocelulósicas Resíduos de mineração Surfactantes Composite Lignocellulosic fibers Mining waste Surfactants Tecnologia de Celulose e Papel |
topic |
Compósito Fibras lignocelulósicas Resíduos de mineração Surfactantes Composite Lignocellulosic fibers Mining waste Surfactants Tecnologia de Celulose e Papel |
description |
The objective was to investigate the use of residues from the pulping of unbleached kraft pulp (UKP) and quartzite mining, as well as the use of the accelerated carbonation (AC) technique and the addition of air-entraining surfactants. Two stages were carried out, the first with 4 initial treatments, which were the control without AC and the others with different periods of AC of 6, 9 and 12 hours. After carrying out the first stage, 3 treatments were produced, the control and the others with the addition of drycast and Darafill air-entraining surfactant additives, verifying those with and without CA for 9 hours. Fiber cements were characterized according to the physical properties of apparent density (AD), water absorption (AA), apparent porosity (PA) and the mechanical properties of modulus of rupture (MOR), modulus of elasticity (MOE), limit of proportionality (LOP ) and toughness. Thermogravimetry (TG) analyzes were approached in order to monitor the formation of carbonates throughout the accelerated carbonation process and scanning electron microscopy (SEM) to verify the interaction between the constituent materials. As a result of the first stage, there was no significant effect on AD, PA and AA in the fiber cements in relation to the different AC times. There was a tendency for the MOR, MOE and LOP values to decrease as the periods subject to CA increased. There was a significant improvement in the tenacity properties of the fiber cements subjected to longer periods of CA, with a tendency for this property to stabilize between 9 am and 12 pm. Regarding the TG and DTG analyses, it was possible to verify that there was the formation of calcium carbonate due to the CA process, leading to a decrease in the alkalinity of the matrix, which provided a less aggressive environment for the UKP fibers. In this way, it was concluded that the best CA time was 9 hours, being the viable technique to improve the interaction between the matrix and the fiber. Regarding the results of the second stage, the fiber cements with the Drycast additive obtained an increase in the results of AA and PA, and a decrease in DA. They did not show differences in the results of MOR, MOE and LOP, and there was a decrease in toughness. As for the fiber cements with Darafill, there was a decrease in the results of AA and PA with the increase in DA. For the MOE and LOP mechanical properties, no difference was observed in relation to the control. However, there was an increase in toughness and MOR. Regarding AC, there was an increase in the results of MOR, MOE and LOP with the use of the technique, as well as there was no significant interaction between surfactants and AC in the studied fiber cements. In this way, the use of additives is concluded, in the case of Drycast, it enabled the reduction of density and, Darafill, improved the mechanical properties MOR and Tenacity. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-02-17T16:04:18Z 2023-02-17T16:04:18Z 2023-02-17 2023-01-26 |
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 |
TERRA, I. C. de C. Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP. 2023. 78 p. Tese (Doutorado em Engenharia de Biomateriais)–Universidade Federal de Lavras, Lavras, 2023. http://repositorio.ufla.br/jspui/handle/1/56030 |
identifier_str_mv |
TERRA, I. C. de C. Carbonatação acelerada em fibrocimentos compostos de resíduos de quartzito e fibras UKP. 2023. 78 p. Tese (Doutorado em Engenharia de Biomateriais)–Universidade Federal de Lavras, Lavras, 2023. |
url |
http://repositorio.ufla.br/jspui/handle/1/56030 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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 |
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1807835156661141504 |