Reciclaje de hormigón de retorno mediante aditivo pelletizante
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Archivos
Fecha
2023
Autores
Profesor/a Guía
Facultad/escuela
Idioma
es
Título de la revista
ISSN de la revista
Título del volumen
Editor
Universidad Andrés Bello
Nombre de Curso
Licencia CC
Licencia CC
Resumen
En las últimas décadas, el crecimiento exponencial de la industria de la construcción ha generado un aumento significativo en la demanda de materiales, especialmente de hormigón. Esto implica también un aumento en la demanda de recursos naturales no renovables del planeta. Actualmente,
en promedio un 2% del hormigón fabricado a nivel mundial es devuelto a su planta de elaboración para ser desechado. En este contexto, el reciclaje de hormigón ha surgido como una solución prometedora y respetuosa con el medio ambiente. Dentro de las técnicas de reciclaje de hormigón disponibles se sitúa el reciclaje mediante aditivo pelletizante, que consta de incorporar un aditivo a la mezcla de hormigón devuelta que aún se encuentra fresca, convirtiendo la mezcla en material granular que puede usarse como árido reciclado en la fabricación de nuevas mezclas de hormigón.
En el presente documento se muestra cómo afecta al hormigón la incorporación de árido reciclado mediante aditivo pelletizante, en términos de resistencia y trabajabilidad. Del trabajo experimental se obtiene que al reemplazar árido natural por árido pelletizado en un 10% se alcanza un aumento de resistencia del 15.2 %, que progresivamente irá disminuyendo si se incrementa el porcentaje de reemplazo. Para el caso de morteros o shotcretes la resistencia aumenta hasta un 9.8% en reemplazos del 5%. En términos de trabajabilidad, el hormigón no sufre variaciones significativas,
en cambio, el shotcrete en porcentajes de reemplazo desde el 10% comienza a generar indicios de segregación y exudación.
In the last decades, the exponential growth of the construction industry has generated a significant increase in the demand for materials, especially concrete. This also implies an increase in the demand for non-renewable natural resources of the planet. Currently, on average, 2% of the concrete manufactured worldwide is returned to the production plant to be discarded. In this context, concrete recycling has emerged as a promising and environmentally-friendly solution. Among the available concrete recycling techniques, recycling using a pelletizing additive is included, which involves incorporating an additive into the fresh concrete mix that is returned, converting the mix into granular material that can be used as recycled aggregate in the production of new concretes. This document shows how the incorporation of recycled aggregate using a pelletizing additive affects concrete in terms of strength and workability. From the experimental work, it is found that by replacing natural aggregate with pelletized aggregate at a 10% rate, a 15.2% increase in strength is achieved, which progressively decreases as the replacement percentage is increased. For mortars or shotcretes, the strength increases up to 9.8% with 5% replacements. In terms of workability, concret is not significantly affected. However, shotcrete, with replacement percentages starting from 10%, begins to show signs of segregation and bleeding.
In the last decades, the exponential growth of the construction industry has generated a significant increase in the demand for materials, especially concrete. This also implies an increase in the demand for non-renewable natural resources of the planet. Currently, on average, 2% of the concrete manufactured worldwide is returned to the production plant to be discarded. In this context, concrete recycling has emerged as a promising and environmentally-friendly solution. Among the available concrete recycling techniques, recycling using a pelletizing additive is included, which involves incorporating an additive into the fresh concrete mix that is returned, converting the mix into granular material that can be used as recycled aggregate in the production of new concretes. This document shows how the incorporation of recycled aggregate using a pelletizing additive affects concrete in terms of strength and workability. From the experimental work, it is found that by replacing natural aggregate with pelletized aggregate at a 10% rate, a 15.2% increase in strength is achieved, which progressively decreases as the replacement percentage is increased. For mortars or shotcretes, the strength increases up to 9.8% with 5% replacements. In terms of workability, concret is not significantly affected. However, shotcrete, with replacement percentages starting from 10%, begins to show signs of segregation and bleeding.
Notas
Memoria (Ingeniero Civil)
Palabras clave
Hormigón, Agregados (Materiales de Construcción), Reciclaje, Pruebas