Effects of storage temperature and time on false setting behavior of CPI-S Portland cement

Detalhes bibliográficos
Autor(a) principal: Mota,R. M.
Data de Publicação: 2020
Outros Autores: Silva,A. S., Ramos,V. H. S., Rezende,J. C. T., Jesus,E. de
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=S0366-69132020000300321
Resumo: Abstract The false setting is when cement stiffens prematurely in a few minutes after adding water. Some variables could cause false setting in CPI-S-32 Portland cement, for example, alkali concentration in the cement, the formation of alite (C3S) with low reactivity, and cement storage temperature and time in silos. Temperature increases cause calcium sulfate dihydrate to dehydrate, forming hemihydrate (CaSO4.0.5H2O) or anhydrite (CaSO4), which causes the false setting. In this study, the influence of cement storage temperature (100, 105, 110, 120, and 130 °C) combined with the cement storage time (30, 60, and 120 min) in a silo was studied regarding the CPI-S-32 false setting behavior. It was verified that temperatures above 110 °C and storage time above 60 min are conditions that favor the false setting of CPI-S-32 cement. Physicochemical analysis, TG/DTG, XRF, and XRD were applied as complementary analyzes for the false setting assays of CPI-S-32.
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spelling Effects of storage temperature and time on false setting behavior of CPI-S Portland cementfalse settingCPI-S-32 Portland cementcement storage temperaturecement storage timeAbstract The false setting is when cement stiffens prematurely in a few minutes after adding water. Some variables could cause false setting in CPI-S-32 Portland cement, for example, alkali concentration in the cement, the formation of alite (C3S) with low reactivity, and cement storage temperature and time in silos. Temperature increases cause calcium sulfate dihydrate to dehydrate, forming hemihydrate (CaSO4.0.5H2O) or anhydrite (CaSO4), which causes the false setting. In this study, the influence of cement storage temperature (100, 105, 110, 120, and 130 °C) combined with the cement storage time (30, 60, and 120 min) in a silo was studied regarding the CPI-S-32 false setting behavior. It was verified that temperatures above 110 °C and storage time above 60 min are conditions that favor the false setting of CPI-S-32 cement. Physicochemical analysis, TG/DTG, XRF, and XRD were applied as complementary analyzes for the false setting assays of CPI-S-32.Associação Brasileira de Cerâmica2020-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132020000300321Cerâmica v.66 n.379 2020reponame:Cerâmica (São Paulo. Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/0366-69132020663792842info:eu-repo/semantics/openAccessMota,R. M.Silva,A. S.Ramos,V. H. S.Rezende,J. C. T.Jesus,E. deeng2020-07-14T00:00:00Zoai:scielo:S0366-69132020000300321Revistahttps://www.scielo.br/j/ce/PUBhttps://old.scielo.br/oai/scielo-oai.phpceram.abc@gmail.com||ceram.abc@gmail.com1678-45530366-6913opendoar:2020-07-14T00:00Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Effects of storage temperature and time on false setting behavior of CPI-S Portland cement
title Effects of storage temperature and time on false setting behavior of CPI-S Portland cement
spellingShingle Effects of storage temperature and time on false setting behavior of CPI-S Portland cement
Mota,R. M.
false setting
CPI-S-32 Portland cement
cement storage temperature
cement storage time
title_short Effects of storage temperature and time on false setting behavior of CPI-S Portland cement
title_full Effects of storage temperature and time on false setting behavior of CPI-S Portland cement
title_fullStr Effects of storage temperature and time on false setting behavior of CPI-S Portland cement
title_full_unstemmed Effects of storage temperature and time on false setting behavior of CPI-S Portland cement
title_sort Effects of storage temperature and time on false setting behavior of CPI-S Portland cement
author Mota,R. M.
author_facet Mota,R. M.
Silva,A. S.
Ramos,V. H. S.
Rezende,J. C. T.
Jesus,E. de
author_role author
author2 Silva,A. S.
Ramos,V. H. S.
Rezende,J. C. T.
Jesus,E. de
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Mota,R. M.
Silva,A. S.
Ramos,V. H. S.
Rezende,J. C. T.
Jesus,E. de
dc.subject.por.fl_str_mv false setting
CPI-S-32 Portland cement
cement storage temperature
cement storage time
topic false setting
CPI-S-32 Portland cement
cement storage temperature
cement storage time
description Abstract The false setting is when cement stiffens prematurely in a few minutes after adding water. Some variables could cause false setting in CPI-S-32 Portland cement, for example, alkali concentration in the cement, the formation of alite (C3S) with low reactivity, and cement storage temperature and time in silos. Temperature increases cause calcium sulfate dihydrate to dehydrate, forming hemihydrate (CaSO4.0.5H2O) or anhydrite (CaSO4), which causes the false setting. In this study, the influence of cement storage temperature (100, 105, 110, 120, and 130 °C) combined with the cement storage time (30, 60, and 120 min) in a silo was studied regarding the CPI-S-32 false setting behavior. It was verified that temperatures above 110 °C and storage time above 60 min are conditions that favor the false setting of CPI-S-32 cement. Physicochemical analysis, TG/DTG, XRF, and XRD were applied as complementary analyzes for the false setting assays of CPI-S-32.
publishDate 2020
dc.date.none.fl_str_mv 2020-09-01
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=S0366-69132020000300321
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132020000300321
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/0366-69132020663792842
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.66 n.379 2020
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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