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      Cement production with pozzolans from residual tropical soils formed from paragneiss with a high silicon oxide content Translated title: Producción de cemento con puzolanas de suelos tropicales residuales de paragneis con alto contenido de óxido de silicio

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          Abstract

          Abstract The manufacture of cement demands a lot of energy and gives off large amounts of CO2. Calcined clays need less energy and emit water instead of CO2, which has drawn attention to them, especially those rich in kaolinite. However, their use has been discouraged due to their location and high market price. Hence, the present study focuses on calcined clays with a low kaolinite content, specifically those derived from paragneiss. In Colombia they are located in weathering horizons with depths of up to 40 meters. The results showed contents of 20% Al2O3, less than 14% Fe2O3, more than 60% SiO2, less than 40% kaolinite, 20% illite and more than 30% quartz. Calcined at 750 °C, they were used in mortars, obtaining SAI values of between 80 and 100% after 28 days, which, added to the results of Frattini tests, show that their use as a supplementary cementing material is feasible.

          Translated abstract

          Resumen La manufactura del cemento demanda mucha energía y aporta cantidades importantes de CO2. Las arcillas calcinadas, demandan menos energía y emiten en vez de CO2, agua a la atmósfera, convirtiéndolas en objeto de atención, fundamentalmente aquellas ricas en caolinita. No obstante, están siendo desincentivadas, por su ubicación y alto precio en el mercado. El presente estudio se enfocó hacia las arcillas de bajo contenido de caolinita, como las derivadas de paragneiss, encontrándose en Colombia, horizontes de meteorización con profundidades hasta 40 metros. Los resultados arrojaron contenidos de Al2O3 del 20%, Fe2O3 menores al 14%, SiO2 mayores al 60%, contenidos de caolinita menores de 40%, illita 20% y cuarzo mayores al 30%. Siendo calcinadas a 750 °C, se emplearon en morteros, obteniendo valores de IAR a 28 días entre el 80 y 100%, que sumados a los resultados de ensayos Frattini, muestran que su uso como material cementante suplementario es factible.

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          Most cited references18

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          Cement substitution by a combination of metakaolin and limestone

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            Metakaolin and calcined clays as pozzolans for concrete: a review

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              Calcined clay limestone cements (LC3)

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                Author and article information

                Journal
                dyna
                DYNA
                Dyna rev.fac.nac.minas
                Universidad Nacional de Colombia (Medellín, Antioquia, Colombia )
                0012-7353
                2346-2183
                June 2020
                : 87
                : 213
                : 69-74
                Affiliations
                [1] Medellín orgnameUniversidad Nacional de Colombia orgdiv1Facultad de Minas orgdiv2Grupo del Cemento y Materiales de Construcción Colombia oovasquezt@ 123456unal.edu.co
                Article
                S0012-73532020000200069 S0012-7353(20)08721300069
                10.15446/dyna.v87n213.83208
                9b4f89c1-1161-449c-971c-5137d7fba83c

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                : 17 March 2020
                : 28 October 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 19, Pages: 6
                Product

                SciELO Colombia

                Categories
                Articles

                supplementary cementing material,Puzolanas,arcillas calcinadas,calcined clays: low kaolinite clay,arcilla de bajo contenido de caolinita,suelos residuales en la fabricación de cemento,Pozzolans,residual soils in cement manufacturing,material cementante suplementario

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