Características petrográficas de pastas de cemento y mezclas de mortero y su relación con los diferentes tipos de curado
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Se analizaron las propiedades mecánicas de 18 cubos de pastas de cemento Portland y 18 cubos de mortero con arena de Ottawa; confirmando experimentalmente que la resistencia a la compresión es mayor bajo curado húmedo que bajo curado ambiente. Desde el punto de vista petrográfico, se analizaron 24 secciones delgadas de pastas de cemento y 24 secciones delgadas de morteros, de muestras curadas por inmersión y al aire durante 7 y 28 días, en una cámara de curado. Las características petrográficas de los minerales de cemento y productos de hidratación estudiados, permitieron determinar que bajo curado húmedo se forma más gel C-S-H y cristales de portlandita más gruesos que bajo curado ambiente, es decir, hay mayor grado de hidratación en las muestras, esto coincide con los resultados obtenidos en los ensayos de resistencia a la compresión. Se determinó que los valores de relación A/C utilizados, no son relevantes para la variación del contenido y del tamaño de las fases minerales.
Abstract: The mechanical properties of 18 cubes of Portland cement pastes and 18 mortar cubes with Ottawa’s sand were analyzed; the compressive strength of specimens cured by water was higher than that of specimens cured by air, this was experimentally confirmed. From a petrographic point of view, 24 cement pastes thin sections and 24 mortars thin sections of samples cured during 7 and 28 days, by immersion and air, in a curing chamber, were analyzed The petrographic characteristics of cement minerals and hydration products showed that specimens cured by water, have higher contents of C-S-H gel and thicker portlandite crystals, as a consequence of a higher degree of hydration. This can be correlated with the mechanical results. It was determined that the variation of W / C ratios was not relevant for the content and size of the mineral phases.
Abstract: The mechanical properties of 18 cubes of Portland cement pastes and 18 mortar cubes with Ottawa’s sand were analyzed; the compressive strength of specimens cured by water was higher than that of specimens cured by air, this was experimentally confirmed. From a petrographic point of view, 24 cement pastes thin sections and 24 mortars thin sections of samples cured during 7 and 28 days, by immersion and air, in a curing chamber, were analyzed The petrographic characteristics of cement minerals and hydration products showed that specimens cured by water, have higher contents of C-S-H gel and thicker portlandite crystals, as a consequence of a higher degree of hydration. This can be correlated with the mechanical results. It was determined that the variation of W / C ratios was not relevant for the content and size of the mineral phases.