El hormigón autocompactante con alto volumen de adición activa y no activa. Propiedades y disminución de su huella ecológica utilizando materiales regionales (Córdoba-Argentina)
Date
2014
Journal Title
Journal ISSN
Volume Title
Publisher
Instituto Brasileño de hormigón
Abstract
Este trabajo presenta los resultados de la incorporación de adiciones activas y no activas para verificar el
comportamiento y la huella ecológica de los hormigones autocompactantes como un medio de contribución
para minimizar la contaminación ambiental.
La fabricación del cemento y las mezclas en las que interviene son una de las mayores causas del
calentamiento global y los cambios climáticos. El uso de las adiciones activas y no activas ha alcanzado un
importante nivel cuando es usado en el hormigón como material suplementario del cemento; ya es común
su uso en pequeños volúmenes, pero no lo es tanto en altos volúmenes debido a la disminución que se
produce en la resistencia a edades tempranas.
Las adiciones usadas fueron filler, ceniza volante, zeolita y perlita. Las mezclas de hormigón
autocompactantes fueron realizadas con sustitución, en peso, del cemento. La relación agua-material
cementicio fue mantenida constante y la trabajabilidad controlada con aditivo hiperperfluidificante a base de
éter carboxilatos. Los ensayos de autocompactabilidad realizados fueron el del flujo de asentamiento, J-Ring, caja L y V-funnel y en estado endurecido se ensayó a compresión y succión capilar para conocer el
comportamiento de estas variables importantes. La resistencia a compresión fue determinada a las edades
de 7, 28 y 90 días. Se presenta los cálculos de la huella ecológica de las mezclas en estudio
Abstract This paper presents the results of incorporating active and inactive additions to verify the performance and the ecological footprint of self-compacting concrete as a way of contributing to minimizing environmental pollution. The manufacture of cement and the mixtures in which it is involved is one of the major causes of global warming and climate change. The use of active and non-active additions has reached a significant level when used in concrete as a supplementary cement material; its use in small volumes is common at present, but not so much in high volumes due to the decrease in resistance that is produced at early ages. The additions that were used were filler, fly ash, zeolite and perlite. Self-compacting concrete mixtures were made with replacement in weight of cement. The water - cementitious materials ratio was kept constant and the workability was controlled with hyper- fluidifying additive based on ether carboxylates. The trials of self compactability that were made were slump flow , J -ring , L and V - box funnel and in hardened state, compression and capillary suction were tested to know the behavior of these important variables. The resistance to compression was determined at the ages of 7, 28 and 90 days. Calculations of the ecological footprint of the mixtures under study are presented
Abstract This paper presents the results of incorporating active and inactive additions to verify the performance and the ecological footprint of self-compacting concrete as a way of contributing to minimizing environmental pollution. The manufacture of cement and the mixtures in which it is involved is one of the major causes of global warming and climate change. The use of active and non-active additions has reached a significant level when used in concrete as a supplementary cement material; its use in small volumes is common at present, but not so much in high volumes due to the decrease in resistance that is produced at early ages. The additions that were used were filler, fly ash, zeolite and perlite. Self-compacting concrete mixtures were made with replacement in weight of cement. The water - cementitious materials ratio was kept constant and the workability was controlled with hyper- fluidifying additive based on ether carboxylates. The trials of self compactability that were made were slump flow , J -ring , L and V - box funnel and in hardened state, compression and capillary suction were tested to know the behavior of these important variables. The resistance to compression was determined at the ages of 7, 28 and 90 days. Calculations of the ecological footprint of the mixtures under study are presented
Description
Keywords
Hormigón autocompactante, Adición activa, Huella ecológica
Citation
56ª Congreso Brasileiro de Concreto
Endorsement
Review
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