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Assessment of the Compressive Strength of Lime Mortars with Admixtures, Subjected to Two Curing Environments
Evaluación de la resistencia a compresión de morteros de cal adicionados, sujetos a dos ambientes de curado
DOI:
https://doi.org/10.15446/ing.investig.91364Keywords:
Mortar, lime, metakaolin, brick dust, carbonation, compressive strength (en)Mortero, cal, metacaolín, polvo de ladrillo, carbonatación, resistencia a compresión (es)
This article presents the assessment of the compressive strength of three types of lime mortar, one without admixture and the remaining two added with metakaolin and brick dust. The chemical composition of the lime and the pozzolans was evaluated using the X-ray fluorescence (XRF) technique. The mortars were subjected to two curing conditions: humidity and temperature-controlled chamber, and accelerated carbonation chamber, then they were tested at ages of 7, 28, 60 and 90 days. The results showed that the samples cured in the carbonation chamber presented higher compressive strength values than the ones cured in the humidity and temperature-controlled chamber, due to the fact that lime mortars increase their strength with the carbonation of the calcium hydroxide that exists in the lime. Likewise, when adding metakaolin to the lime mortars cured in the humidity and temperature-controlled chamber, the values of compressive strength were close to those of the mortars with lime only, that were cured in the carbonation chamber. From the results of the research, it is notable that the use of pozzolans in lime mortars improves the short-term compressive strength, which is attractive for the rehabilitation of heritage buildings since in short periods of time it manages to match the strengths that lime mortars acquire over time.
En este artículo se presenta la evaluación de la resistencia a compresión de tres tipos de morteros con cal, uno sin adición y los dos restantes adicionados con metacaolín y polvo de ladrillo. La composición química de la cal y las puzolanas se evaluó mediante la técnica de fluorescencia de rayos X. Los morteros fueron sometidos a dos condiciones de curado: cámara de humedad y temperatura controlada, y cámara de carbonatación acelerada, y posteriormente fueron ensayados a las edades de 7,28, 60 y 90 días. Los resultados mostraron que las muestras curadas en cámara de carbonatación presentaron resistencias a la compresión superiores a las de los especímenes curados en cámara de humedad y temperatura controlada, debido a que los morteros de cal aumentan su resistencia con la carbonatación del hidróxido de calcio presente en la cal. De igual manera, al incorporar metacaolín a los morteros de cal curados en cámara de humedad y temperatura controlada, los valores de resistencia a compresión fueron cercanos a aquellos de los morteros con solo cal curados en cámara de carbonatación. A partir de los resultados de la investigación, se destaca que el uso de puzolanas en morteros de cal mejora la resistencia a compresión a corto plazo, lo cual resulta atractivo para la rehabilitación de edificaciones patrimoniales, pues en cortos periodos se logra igualar las resistencias que adquieren los morteros de cal a lo largo del tiempo.
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