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

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        https://digital.cic.gba.gob.ar/handle/11746/10879
        https://repositorioslatinoamericanos.uchile.cl/handle/2250/4413509
        Author
        Cordoba, Gisela
        Rossetti, Agustín
        Falcone, Darío Daniel
        Irassar, Edgardo Fabián
        Institutions
        • Comisión de Investigaciones Científicas (Argentina)
        Abstract
        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.
        Subjects
        Ingeniería de los Materiales
        Sulfates
        Calcined clays
        Alcali silca reaction

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        Red de Repositorios Latinoamericanos
        + of 8.000.000
        Available publications
        500 Participating institutions
        Dirección de Servicios de Información y Bibliotecas (SISIB)
        Universidad de Chile
        Membership Login
        Featured collections
        • Latin American Theses
        • Argentinean Theses
        • Chilean Theses
        • Peruvian Theses
        Latest collections added
        • Argentina
        • Brazil
        • Colombia
        • México
        Dirección de Servicios de Información y Bibliotecas (SISIB)
        Universidad de Chile
        Red de Repositorios Latinoamericanos | 2006-2018