Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste

Detalhes bibliográficos
Autor(a) principal: Torres,I. F.
Data de Publicação: 2022
Outros Autores: Torres,S. M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Cerâmica (São Paulo. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132022000300316
Resumo: Abstract Motivated by their low cost, lignosulfonate-based water reducers are the most used type of admixture in the concrete industry worldwide. Due to the plurality of types of lignosulfonates (LSs) and the recent update to the Brazilian standard for admixtures for concrete, the objective of this work was to investigate the impact of sodium (Na-LS) and magnesium (Mg-LS) lignosulfonates, raw materials present in the Brazilian market, in pastes and concretes produced with cement type CP II F 40 under different dosages (0.40% and 0.80%). For this, the following tests were performed: adsorption curves, isothermal calorimetry, microanalytical tests (TGA/DTG and DRX), and application in the concrete according to NBR 11768-1 standard. The results showed different hydration evolutions among the pastes produced with these lignosulfonates. As a consequence, despite the similarity in water reduction, it was verified that Mg-LS was more suitable for RA1-R (water reducer-retarder, setting time 120-360 min), while Na-LS was more suitable for RA1 (water reducer, setting time 30-160 min).
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spelling Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious pastecharacterizationchemical admixturehydrationlignosulfonatePortland cementAbstract Motivated by their low cost, lignosulfonate-based water reducers are the most used type of admixture in the concrete industry worldwide. Due to the plurality of types of lignosulfonates (LSs) and the recent update to the Brazilian standard for admixtures for concrete, the objective of this work was to investigate the impact of sodium (Na-LS) and magnesium (Mg-LS) lignosulfonates, raw materials present in the Brazilian market, in pastes and concretes produced with cement type CP II F 40 under different dosages (0.40% and 0.80%). For this, the following tests were performed: adsorption curves, isothermal calorimetry, microanalytical tests (TGA/DTG and DRX), and application in the concrete according to NBR 11768-1 standard. The results showed different hydration evolutions among the pastes produced with these lignosulfonates. As a consequence, despite the similarity in water reduction, it was verified that Mg-LS was more suitable for RA1-R (water reducer-retarder, setting time 120-360 min), while Na-LS was more suitable for RA1 (water reducer, setting time 30-160 min).Associação Brasileira de Cerâmica2022-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132022000300316Cerâmica v.68 n.387 2022reponame:Cerâmica (São Paulo. Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/0366-69132022683873268info:eu-repo/semantics/openAccessTorres,I. F.Torres,S. M.eng2022-09-12T00:00:00Zoai:scielo:S0366-69132022000300316Revistahttps://www.scielo.br/j/ce/PUBhttps://old.scielo.br/oai/scielo-oai.phpceram.abc@gmail.com||ceram.abc@gmail.com1678-45530366-6913opendoar:2022-09-12T00:00Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
title Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
spellingShingle Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
Torres,I. F.
characterization
chemical admixture
hydration
lignosulfonate
Portland cement
title_short Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
title_full Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
title_fullStr Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
title_full_unstemmed Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
title_sort Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
author Torres,I. F.
author_facet Torres,I. F.
Torres,S. M.
author_role author
author2 Torres,S. M.
author2_role author
dc.contributor.author.fl_str_mv Torres,I. F.
Torres,S. M.
dc.subject.por.fl_str_mv characterization
chemical admixture
hydration
lignosulfonate
Portland cement
topic characterization
chemical admixture
hydration
lignosulfonate
Portland cement
description Abstract Motivated by their low cost, lignosulfonate-based water reducers are the most used type of admixture in the concrete industry worldwide. Due to the plurality of types of lignosulfonates (LSs) and the recent update to the Brazilian standard for admixtures for concrete, the objective of this work was to investigate the impact of sodium (Na-LS) and magnesium (Mg-LS) lignosulfonates, raw materials present in the Brazilian market, in pastes and concretes produced with cement type CP II F 40 under different dosages (0.40% and 0.80%). For this, the following tests were performed: adsorption curves, isothermal calorimetry, microanalytical tests (TGA/DTG and DRX), and application in the concrete according to NBR 11768-1 standard. The results showed different hydration evolutions among the pastes produced with these lignosulfonates. As a consequence, despite the similarity in water reduction, it was verified that Mg-LS was more suitable for RA1-R (water reducer-retarder, setting time 120-360 min), while Na-LS was more suitable for RA1 (water reducer, setting time 30-160 min).
publishDate 2022
dc.date.none.fl_str_mv 2022-09-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132022000300316
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132022000300316
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/0366-69132022683873268
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Associação Brasileira de Cerâmica
publisher.none.fl_str_mv Associação Brasileira de Cerâmica
dc.source.none.fl_str_mv Cerâmica v.68 n.387 2022
reponame:Cerâmica (São Paulo. Online)
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Cerâmica (São Paulo. Online)
collection Cerâmica (São Paulo. Online)
repository.name.fl_str_mv Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)
repository.mail.fl_str_mv ceram.abc@gmail.com||ceram.abc@gmail.com
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