Ceniza de cáscara de coco como susituto del cemento: efecto de la temperatura de calcinación
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Universidad Santo Tomás. Seccional Bucaramanga
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La disposición de la cáscara de coco es un problema de eliminación de desechos en países donde la producción de coco es abundante. Cuando la cáscara de coco se calcina produce cenizas, las cuales son un material aglutinante potencial para preparar hormigón. En este trabajo se calcinó cáscara de coco a 400°C, 500°C y 600 °C durante 3 h. Las cenizas producidas se emplearon como sustituto del cemento. Las características de las cenizas se evaluaron por área superficial y DRX. El efecto de la sustitución de las cenizas como sustituto del cemento se evaluó mediante ensayos de trabajabilidad y resistencia mecánica. Los resultados experimentales demostraron que 600 °C es la temperatura de combustión más adecuada para la calcinación de la cascara, con presencia de SiO2 amorfo y baja superficial alta. Los resultados mostraron que, en contraste con el hormigón de referencia, la temperatura de combustión disminuye la trabajabilidad del concreto. Además, el aumento de la temperatura de calcinación de la cáscara de coco mejora la resistencia mecánica. La resistencia a compresión de la mezcla que incorporó cenizas de cáscara de coco calcinadas a 600 °C fue superior a las demás. Se encontró adicionalmente que esta temperatura era convincente considerando el costo de preparar las cenizas.
The disposal of coconut shell is a waste problem in countries where coconut production is in abundance. When coconut shell is calcinated produces ashes, which are a potential binder material to concrete preparation. In this work, coconut shell was calcinated at 400, 500 and 600 °C for 3 h. The ashes produced were employed as cement substitute. The characteristics of ashes were evaluated by surface area and XRD. The effect of replacing ashes as cement substitute was evaluated by workability and mechanical strength test. Experimental results demonstrated that 600 °C is the most suitable burning temperature for CSA calcination with amorphous SiO2 and low surface area. Results showed that, in contrast to control concrete, that burning temperature decrease concrete workability of concrete. Further, the increasing of burning temperature of coconut shell improves the mechanical strength. The compressive strength of mixture incorporating the ashes of coconut shell burned at 600 °C was higher than the others. Additionally, this temperature was found convincing considering cost to prepare the ashes.
The disposal of coconut shell is a waste problem in countries where coconut production is in abundance. When coconut shell is calcinated produces ashes, which are a potential binder material to concrete preparation. In this work, coconut shell was calcinated at 400, 500 and 600 °C for 3 h. The ashes produced were employed as cement substitute. The characteristics of ashes were evaluated by surface area and XRD. The effect of replacing ashes as cement substitute was evaluated by workability and mechanical strength test. Experimental results demonstrated that 600 °C is the most suitable burning temperature for CSA calcination with amorphous SiO2 and low surface area. Results showed that, in contrast to control concrete, that burning temperature decrease concrete workability of concrete. Further, the increasing of burning temperature of coconut shell improves the mechanical strength. The compressive strength of mixture incorporating the ashes of coconut shell burned at 600 °C was higher than the others. Additionally, this temperature was found convincing considering cost to prepare the ashes.
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coconut shell, agro-waste, heat-treatment, mechanical properties, cost analysis, cascara de coco, resíduos agroindustriales, tratamiento térmico, propiedades mecánicas, análisis de costos