Sulfate and alkali-silica performance of blended cements containing illitic calcined clays

Autores
Cordoba, Gisela; Rossetti, Agustín; Falcone, Darío Daniel; Irassar, Edgardo Fabián
Año de publicación
2017
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Studies of illitic calcined clays are less developed than that corresponding to kaolinitic clays, but illite is one of the more abundant clayed minerals of the earth’s crust, as occurs in the Center of the Buenos Aires Province (Argentina) where the largest cement factories are located. Illite clays develop pozzolanic properties when they are thermally treated at 950 °C, causing dehydroxilation and collapse of structure to form a metastable or amorphous aluminosilicate. Illitic calcined clays don’t present a significant water demand and the compressive strength of blended cements attains to the corresponding to portland cement at 90 days. It is characterized as slow pozzolana. Illite incorporates certain proportion of reactive alumina and high proportion of alkalis, modifying the pore structure. From durability point of view, the incorporation of illite can affect the sulfate resistance of portland cements or the alkali-silica reaction (ASR). The aim of this paper is to study the behavior of two different illite calcined clay blended cements against chemical attack, like sulfate attack and harmful alkali silica reaction, using the test based on the ASTM C 1012 and ASTM C 441, respectively. For sulfate performance, illite calcined clays was blended with a low C3A in 20% and 40% of weight replacement and a very high C3A cement (white), using a 30% of weight replacement; while a low (Na2Oeq<0.5) and high alkali (Na2Oeq=1.03) cements were used in the ASR-test. After six months, the low and very high C3A cements of both illitic clays shows low expansion in sulfate media (<0.05%) for blended cement without water demand. The ASR-expansion results show that illitic calcined clays reduce considerably the expansion of high alkali cements and it is not harmful to low alkali cement, but long test time results will be conclusive.
Materia
Ingeniería de los Materiales
Sulfates
Calcined clays
Alcali silca reaction
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
CIC Digital (CICBA)
Institución
Comisión de Investigaciones Científicas de la Provincia de Buenos Aires
OAI Identificador
oai:digital.cic.gba.gob.ar:11746/10879

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network_name_str CIC Digital (CICBA)
spelling Sulfate and alkali-silica performance of blended cements containing illitic calcined claysCordoba, GiselaRossetti, AgustínFalcone, Darío DanielIrassar, Edgardo FabiánIngeniería de los MaterialesSulfatesCalcined claysAlcali silca reactionStudies of illitic calcined clays are less developed than that corresponding to kaolinitic clays, but illite is one of the more abundant clayed minerals of the earth’s crust, as occurs in the Center of the Buenos Aires Province (Argentina) where the largest cement factories are located. Illite clays develop pozzolanic properties when they are thermally treated at 950 °C, causing dehydroxilation and collapse of structure to form a metastable or amorphous aluminosilicate. Illitic calcined clays don’t present a significant water demand and the compressive strength of blended cements attains to the corresponding to portland cement at 90 days. It is characterized as slow pozzolana. Illite incorporates certain proportion of reactive alumina and high proportion of alkalis, modifying the pore structure. From durability point of view, the incorporation of illite can affect the sulfate resistance of portland cements or the alkali-silica reaction (ASR). The aim of this paper is to study the behavior of two different illite calcined clay blended cements against chemical attack, like sulfate attack and harmful alkali silica reaction, using the test based on the ASTM C 1012 and ASTM C 441, respectively. For sulfate performance, illite calcined clays was blended with a low C3A in 20% and 40% of weight replacement and a very high C3A cement (white), using a 30% of weight replacement; while a low (Na2Oeq<0.5) and high alkali (Na2Oeq=1.03) cements were used in the ASR-test. After six months, the low and very high C3A cements of both illitic clays shows low expansion in sulfate media (<0.05%) for blended cement without water demand. The ASR-expansion results show that illitic calcined clays reduce considerably the expansion of high alkali cements and it is not harmful to low alkali cement, but long test time results will be conclusive.2017-12info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttps://digital.cic.gba.gob.ar/handle/11746/10879enginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/reponame:CIC Digital (CICBA)instname:Comisión de Investigaciones Científicas de la Provincia de Buenos Airesinstacron:CICBA2025-09-29T13:40:00Zoai:digital.cic.gba.gob.ar:11746/10879Institucionalhttp://digital.cic.gba.gob.arOrganismo científico-tecnológicoNo correspondehttp://digital.cic.gba.gob.ar/oai/snrdmarisa.degiusti@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:94412025-09-29 13:40:00.531CIC Digital (CICBA) - Comisión de Investigaciones Científicas de la Provincia de Buenos Airesfalse
dc.title.none.fl_str_mv Sulfate and alkali-silica performance of blended cements containing illitic calcined clays
title Sulfate and alkali-silica performance of blended cements containing illitic calcined clays
spellingShingle Sulfate and alkali-silica performance of blended cements containing illitic calcined clays
Cordoba, Gisela
Ingeniería de los Materiales
Sulfates
Calcined clays
Alcali silca reaction
title_short Sulfate and alkali-silica performance of blended cements containing illitic calcined clays
title_full Sulfate and alkali-silica performance of blended cements containing illitic calcined clays
title_fullStr Sulfate and alkali-silica performance of blended cements containing illitic calcined clays
title_full_unstemmed Sulfate and alkali-silica performance of blended cements containing illitic calcined clays
title_sort Sulfate and alkali-silica performance of blended cements containing illitic calcined clays
dc.creator.none.fl_str_mv Cordoba, Gisela
Rossetti, Agustín
Falcone, Darío Daniel
Irassar, Edgardo Fabián
author Cordoba, Gisela
author_facet Cordoba, Gisela
Rossetti, Agustín
Falcone, Darío Daniel
Irassar, Edgardo Fabián
author_role author
author2 Rossetti, Agustín
Falcone, Darío Daniel
Irassar, Edgardo Fabián
author2_role author
author
author
dc.subject.none.fl_str_mv Ingeniería de los Materiales
Sulfates
Calcined clays
Alcali silca reaction
topic Ingeniería de los Materiales
Sulfates
Calcined clays
Alcali silca reaction
dc.description.none.fl_txt_mv Studies of illitic calcined clays are less developed than that corresponding to kaolinitic clays, but illite is one of the more abundant clayed minerals of the earth’s crust, as occurs in the Center of the Buenos Aires Province (Argentina) where the largest cement factories are located. Illite clays develop pozzolanic properties when they are thermally treated at 950 °C, causing dehydroxilation and collapse of structure to form a metastable or amorphous aluminosilicate. Illitic calcined clays don’t present a significant water demand and the compressive strength of blended cements attains to the corresponding to portland cement at 90 days. It is characterized as slow pozzolana. Illite incorporates certain proportion of reactive alumina and high proportion of alkalis, modifying the pore structure. From durability point of view, the incorporation of illite can affect the sulfate resistance of portland cements or the alkali-silica reaction (ASR). The aim of this paper is to study the behavior of two different illite calcined clay blended cements against chemical attack, like sulfate attack and harmful alkali silica reaction, using the test based on the ASTM C 1012 and ASTM C 441, respectively. For sulfate performance, illite calcined clays was blended with a low C3A in 20% and 40% of weight replacement and a very high C3A cement (white), using a 30% of weight replacement; while a low (Na2Oeq<0.5) and high alkali (Na2Oeq=1.03) cements were used in the ASR-test. After six months, the low and very high C3A cements of both illitic clays shows low expansion in sulfate media (<0.05%) for blended cement without water demand. The ASR-expansion results show that illitic calcined clays reduce considerably the expansion of high alkali cements and it is not harmful to low alkali cement, but long test time results will be conclusive.
description Studies of illitic calcined clays are less developed than that corresponding to kaolinitic clays, but illite is one of the more abundant clayed minerals of the earth’s crust, as occurs in the Center of the Buenos Aires Province (Argentina) where the largest cement factories are located. Illite clays develop pozzolanic properties when they are thermally treated at 950 °C, causing dehydroxilation and collapse of structure to form a metastable or amorphous aluminosilicate. Illitic calcined clays don’t present a significant water demand and the compressive strength of blended cements attains to the corresponding to portland cement at 90 days. It is characterized as slow pozzolana. Illite incorporates certain proportion of reactive alumina and high proportion of alkalis, modifying the pore structure. From durability point of view, the incorporation of illite can affect the sulfate resistance of portland cements or the alkali-silica reaction (ASR). The aim of this paper is to study the behavior of two different illite calcined clay blended cements against chemical attack, like sulfate attack and harmful alkali silica reaction, using the test based on the ASTM C 1012 and ASTM C 441, respectively. For sulfate performance, illite calcined clays was blended with a low C3A in 20% and 40% of weight replacement and a very high C3A cement (white), using a 30% of weight replacement; while a low (Na2Oeq<0.5) and high alkali (Na2Oeq=1.03) cements were used in the ASR-test. After six months, the low and very high C3A cements of both illitic clays shows low expansion in sulfate media (<0.05%) for blended cement without water demand. The ASR-expansion results show that illitic calcined clays reduce considerably the expansion of high alkali cements and it is not harmful to low alkali cement, but long test time results will be conclusive.
publishDate 2017
dc.date.none.fl_str_mv 2017-12
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url https://digital.cic.gba.gob.ar/handle/11746/10879
dc.language.none.fl_str_mv eng
language eng
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