Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement composites

Detalhes bibliográficos
Autor(a) principal: Cardoso, Michell Gleison Sáles
Data de Publicação: 2022
Outros Autores: Oliveira, Dhimitrius Neves Paraguassu Smith de, Bufalino, Lina, Souza, Tiago Marcolino de
Tipo de documento: Artigo
Idioma: por
Título da fonte: Research, Society and Development
Texto Completo: https://rsdjournal.org/index.php/rsd/article/view/31259
Resumo: The work aimed to evaluate the coconut mesocarp fibers (Cocos nucifera L.) in natura and submitted them to physical and chemical treatments for application in Portland cement composites. In natura fibers were subjected to four different treatments: immersion in cold water at 21ºC; immersion in hot water at 90ºC; immersion in 5% NaOH aqueous solution; and immersion in 24% H2O2 and 4% NaOH aqueous solution. In natura and treated fibers were evaluated by X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy. Calorimetric tests were used to assess the influence of fibers obtained from different treatments on the exothermic behavior of cement during hydration. The results indicated that all treatments increased the crystallinity index, especially the alkaline followed by bleaching treatment (41.2%). The calorimetry test suggested that in natura and hot water treated fibers inhibited the cement hydration significantly. On the other hand, cold water, alkaline, and alkaline followed by bleaching treatments exhibited greater potential for application in cementitious composites.
id UNIFEI_ee7b6552ac99f0c38477a33737b36a1c
oai_identifier_str oai:ojs.pkp.sfu.ca:article/31259
network_acronym_str UNIFEI
network_name_str Research, Society and Development
repository_id_str
spelling Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement compositesTratamientos físicos y químicos de fibras residuales de Cocos nucifera L. con vistas a su aplicación en composites cementososTratamentos físicos e químicos de fibras residuais de Cocos nucifera L. visando aplicação em compósitos cimentíciosResíduosBiomassaTratamento alcalinoCompósitos cimentícios.WasteBiomassAlkaline treatmentCement composite.ResiduosBiomasaTratamiento alcalinoComposites cementosos.The work aimed to evaluate the coconut mesocarp fibers (Cocos nucifera L.) in natura and submitted them to physical and chemical treatments for application in Portland cement composites. In natura fibers were subjected to four different treatments: immersion in cold water at 21ºC; immersion in hot water at 90ºC; immersion in 5% NaOH aqueous solution; and immersion in 24% H2O2 and 4% NaOH aqueous solution. In natura and treated fibers were evaluated by X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy. Calorimetric tests were used to assess the influence of fibers obtained from different treatments on the exothermic behavior of cement during hydration. The results indicated that all treatments increased the crystallinity index, especially the alkaline followed by bleaching treatment (41.2%). The calorimetry test suggested that in natura and hot water treated fibers inhibited the cement hydration significantly. On the other hand, cold water, alkaline, and alkaline followed by bleaching treatments exhibited greater potential for application in cementitious composites.El trabajo se centró en evaluar las fibras del mesocarpio de coco (Cocos nucifera L.) en estado in natura y sometidas a tratamientos físicos y químicos para su aplicación en composites de cemento Portland. Las fibras in natura fueron sometidas a cuatro tratamientos diferentes: inmersión en agua fría a 21ºC; inmersión en agua caliente a 90ºC; inmersión en solución acuosa de NaOH al 5%; e inmersión en una solución acuosa de H2O2 al 24% y NaOH al 4%. Las fibras in natura y tratadas se evaluaron por difracción de rayos X, microscopía electrónica de barrido y espectroscopía infrarroja transformada de Fourier. Se utilizaron pruebas de calorimetría para evaluar la influencia de las fibras obtenidas de diferentes tratamientos en el comportamiento exotérmico de la hidratación del cemento. Los resultados indicaron que todos los tratamientos aumentaron el índice de cristalinidad, con énfasis en el tratamiento alcalino seguido del blanqueo (41,2%). La prueba de calorimetría indicó que la fibra in natura y la tratada con agua caliente inhibieron significativamente la hidratación del cemento. Por otro lado, los tratamientos con agua fría, alcalinos y alcalinos seguidos de blanqueo dieron como resultado fibras con mayor potencial de aplicación en composites cementosos.O trabalho teve como foco avaliar as fibras do mesocarpo do coco (Cocos nucifera L.) na condição in natura e submetidas a tratamentos físicos e químicos para aplicação em compósitos de cimento Portland. As fibras in natura foram submetidas a quatro tratamentos distintos: imersão em água fria a 21ºC; imersão em água quente a 90ºC; imersão em solução aquosa de NaOH a 5%; e imersão em solução aquosa de H2O2 a 24% e de NaOH a 4%. As fibras in natura e tratadas foram avaliadas por difração de raios-x, microscopia eletrônica de varredura e espectroscopia no infravermelho com transformada de Fourier. Testes de calorimetria foram utilizados para avaliar a influência das fibras obtidas de diferentes tratamentos no comportamento exotérmico da hidratação do cimento. Os resultados indicaram que todos os tratamentos aumentaram o índice de cristalinidade, com destaque para o tratamento alcalino seguido de branqueamento (41,2 %). O ensaio de calorimetria indicou que a fibra in natura e a tratada com água quente inibiu significativamente a hidratação do cimento. Por outro lado, os tratamentos com água fria, alcalino e alcalino seguido branqueamento resultaram em fibras com maior potencial para aplicação em compósitos cimentícios.Research, Society and Development2022-06-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://rsdjournal.org/index.php/rsd/article/view/3125910.33448/rsd-v11i8.31259Research, Society and Development; Vol. 11 No. 8; e57311831259Research, Society and Development; Vol. 11 Núm. 8; e57311831259Research, Society and Development; v. 11 n. 8; e573118312592525-3409reponame:Research, Society and Developmentinstname:Universidade Federal de Itajubá (UNIFEI)instacron:UNIFEIporhttps://rsdjournal.org/index.php/rsd/article/view/31259/26812Copyright (c) 2022 Michell Gleison Sáles Cardoso; Dhimitrius Neves Paraguassu Smith de Oliveira; Lina Bufalino; Tiago Marcolino de Souzahttps://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessCardoso, Michell Gleison Sáles Oliveira, Dhimitrius Neves Paraguassu Smith de Bufalino, LinaSouza, Tiago Marcolino de 2022-07-01T13:34:06Zoai:ojs.pkp.sfu.ca:article/31259Revistahttps://rsdjournal.org/index.php/rsd/indexPUBhttps://rsdjournal.org/index.php/rsd/oairsd.articles@gmail.com2525-34092525-3409opendoar:2024-01-17T09:47:40.009891Research, Society and Development - Universidade Federal de Itajubá (UNIFEI)false
dc.title.none.fl_str_mv Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement composites
Tratamientos físicos y químicos de fibras residuales de Cocos nucifera L. con vistas a su aplicación en composites cementosos
Tratamentos físicos e químicos de fibras residuais de Cocos nucifera L. visando aplicação em compósitos cimentícios
title Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement composites
spellingShingle Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement composites
Cardoso, Michell Gleison Sáles
Resíduos
Biomassa
Tratamento alcalino
Compósitos cimentícios.
Waste
Biomass
Alkaline treatment
Cement composite.
Residuos
Biomasa
Tratamiento alcalino
Composites cementosos.
title_short Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement composites
title_full Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement composites
title_fullStr Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement composites
title_full_unstemmed Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement composites
title_sort Physical and chemical treatments of residual fibers from Cocos nucifera L. aiming application in cement composites
author Cardoso, Michell Gleison Sáles
author_facet Cardoso, Michell Gleison Sáles
Oliveira, Dhimitrius Neves Paraguassu Smith de
Bufalino, Lina
Souza, Tiago Marcolino de
author_role author
author2 Oliveira, Dhimitrius Neves Paraguassu Smith de
Bufalino, Lina
Souza, Tiago Marcolino de
author2_role author
author
author
dc.contributor.author.fl_str_mv Cardoso, Michell Gleison Sáles
Oliveira, Dhimitrius Neves Paraguassu Smith de
Bufalino, Lina
Souza, Tiago Marcolino de
dc.subject.por.fl_str_mv Resíduos
Biomassa
Tratamento alcalino
Compósitos cimentícios.
Waste
Biomass
Alkaline treatment
Cement composite.
Residuos
Biomasa
Tratamiento alcalino
Composites cementosos.
topic Resíduos
Biomassa
Tratamento alcalino
Compósitos cimentícios.
Waste
Biomass
Alkaline treatment
Cement composite.
Residuos
Biomasa
Tratamiento alcalino
Composites cementosos.
description The work aimed to evaluate the coconut mesocarp fibers (Cocos nucifera L.) in natura and submitted them to physical and chemical treatments for application in Portland cement composites. In natura fibers were subjected to four different treatments: immersion in cold water at 21ºC; immersion in hot water at 90ºC; immersion in 5% NaOH aqueous solution; and immersion in 24% H2O2 and 4% NaOH aqueous solution. In natura and treated fibers were evaluated by X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy. Calorimetric tests were used to assess the influence of fibers obtained from different treatments on the exothermic behavior of cement during hydration. The results indicated that all treatments increased the crystallinity index, especially the alkaline followed by bleaching treatment (41.2%). The calorimetry test suggested that in natura and hot water treated fibers inhibited the cement hydration significantly. On the other hand, cold water, alkaline, and alkaline followed by bleaching treatments exhibited greater potential for application in cementitious composites.
publishDate 2022
dc.date.none.fl_str_mv 2022-06-30
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://rsdjournal.org/index.php/rsd/article/view/31259
10.33448/rsd-v11i8.31259
url https://rsdjournal.org/index.php/rsd/article/view/31259
identifier_str_mv 10.33448/rsd-v11i8.31259
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://rsdjournal.org/index.php/rsd/article/view/31259/26812
dc.rights.driver.fl_str_mv https://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Research, Society and Development
publisher.none.fl_str_mv Research, Society and Development
dc.source.none.fl_str_mv Research, Society and Development; Vol. 11 No. 8; e57311831259
Research, Society and Development; Vol. 11 Núm. 8; e57311831259
Research, Society and Development; v. 11 n. 8; e57311831259
2525-3409
reponame:Research, Society and Development
instname:Universidade Federal de Itajubá (UNIFEI)
instacron:UNIFEI
instname_str Universidade Federal de Itajubá (UNIFEI)
instacron_str UNIFEI
institution UNIFEI
reponame_str Research, Society and Development
collection Research, Society and Development
repository.name.fl_str_mv Research, Society and Development - Universidade Federal de Itajubá (UNIFEI)
repository.mail.fl_str_mv rsd.articles@gmail.com
_version_ 1797052715663097856

Registros relacionados