Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | |
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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Cerâmica (São Paulo. Online) |
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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 |
_version_ |
1748936785100013568 |