Durability of blended cements containing illitic calcined clays

cic.institucionOrigenLaboratorio de Entrenamiento Multidisciplinario para la Investigación Tecnológicaes
cic.isFulltexttruees
cic.isPeerReviewedtruees
cic.lugarDesarrolloLaboratorio de Entrenamiento Multidisciplinario para la Investigación Tecnológicaes
cic.versioninfo:eu-repo/semantics/publishedVersiones
dc.date.accessioned2021-05-20T12:34:07Z
dc.date.available2021-05-20T12:34:07Z
dc.identifier.urihttps://digital.cic.gba.gob.ar/handle/11746/10943
dc.titleDurability of blended cements containing illitic calcined clayses
dc.typeDocumento de conferenciaes
dcterms.abstractIllitic clays have pozzolanic activity after thermal treatment at 950 ºC causing dehydroxilation and structure collapse to form metastable aluminosilicate associated with large proportion of iron oxides (~7.0%) and alkalis (~5.0%Na2Oeq). In this paper, the performance against sulfate attack, chloride penetration and alkali silica reaction of different blended cements containing illitic calcined clays were studied. Sulfate attack was studied using the ASTM C1012 expansion test in blended cements containing low and very high C3A portland cements. After one year, calcined clay completely controls the expansion of very high C3A-cement and improves the performance of low C3A-cement. Chloride resistance of concrete mixtures was determined by natural chloride diffusion (ASTM C1556). Addition of calcined illitic clay (25%) refines the pore structure as indicate the MIP analyses improving the resistance to chloride diffusion and increasing the fraction of bound chlorides some part as chloroaluminate. Alkali-silica reaction was studied using the ASTM C441 procedure with 25% calcined clay added to low, medium and high alkalis Portland cements. The illitic calcined clay reduces the expansion of Portland cements due to the consumption of alkali by the pozzolanic reaction as indicate the determination of available alkalis. Also, the alkalis provide from pozzolan does not impairs significantly the expansion of low alkali Portland cement. Illitic calcined clay used as appropriate portland cement replacement improves the performance of cementitious materials due to the pozzolanic reaction that refines the porosity and consumes the calcium hydroxide and the alkalis in the system.en
dcterms.creator.authorIrassar, Edgardo Fabiánes
dcterms.creator.authorCordoba, Giselaes
dcterms.creator.authorZito, Silvinaes
dcterms.creator.authorRossetti, Agustínes
dcterms.creator.authorRahhal, Vivianaes
dcterms.creator.authorFalcone, Darío Danieles
dcterms.isPartOf.series15th International Congress on the Chemistry of Cement, ICCC (Praga, 2019)es
dcterms.issued2019-09
dcterms.languageIngléses
dcterms.licenseAtribución 4.0 Internacionales
dcterms.subjectDurabilityen
dcterms.subjectCalcined claysen
dcterms.subject.materiaIngeniería de los Materialeses

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