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Ultra-high-performance concrete with local high unburned carbon fly ash
Concreto de ultra alto desempeño con ceniza volante local con alto contenido de inquemados
DOI:
https://doi.org/10.15446/dyna.v88n216.89234Palabras clave:
Ultra high performance concrete (UHPC), high unburned carbon fly ash, optimization, sustainability, design of experiments (DoE) (en)Concreto de ultra alto desempeño (UHPC), ceniza volante con elevado contenido en inquemados, optimización, sostenibilidad, diseño de experimentos (DoE) (es)
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Ultra-high-performance concrete (UHPC) is a kind of high-tech cementitious material with superb mechanical and durability properties compared to other types of concrete. However, due to the high content of cement and silica fume used, the cost and environmental impact of UHPC is considerably higher than conventional concrete. For this reason, several efforts around the world have been made to develop UHPC with greener and less expensive local pozzolans. This study aimed to design and produce UHPC using local fly ash available in Colombia. A numerical optimization, based on Design of Experiments (DoE) and multi-objective criteria, was performed to obtain a mixture with the proper flow and highest compressive strength, while simultaneously having the minimum content of cement. The results showed that, despite the low quality of local fly ashes in Colombia, compressive strength values of 150 MPa without any heat treatment can be achieved.
El concreto de ultra alto desempeño (UHPC) es un tipo de concreto de alta tecnología con excelentes propiedades mecánicas y de durabilidad en comparación con otros tipos de concreto. Sin embargo, debido al alto contenido de cemento y micro sílice necesarios, el costo y el impacto ambiental de UHPC es considerablemente mayor que el del concreto convencional. Por esta razón, se han realizado varios esfuerzos en todo el mundo para desarrollar UHPC con puzolanas locales más ecológicas y menos costosas. Este estudio tuvo como objetivo diseñar y producir UHPC utilizando cenizas volantes locales disponibles en Colombia. Por medio de una optimización numérica, basada en el diseño de experimentos (DoE) y criterios de optimización multi-objetivo, se obtuvo una mezcla con el flujo adecuado y elevada resistencia a la compresión, con las necesidades mínimas de contenido en cemento. Los resultados mostraron que, a pesar de la baja calidad de las cenizas volantes locales en Colombia, se pueden lograr valores de resistencia a la compresión de 150 MPa sin ningún tratamiento térmico.
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28. Joaquín Abellán-García, Jairo A. DSánchez-Díaz, Victoria Eugenia Ospina-Becerra. (2022). Neural network-based optimization of fibres for seismic retrofitting applications of UHPFRC. European Journal of Environmental and Civil Engineering, 26(13), p.6305. https://doi.org/10.1080/19648189.2021.1938687.
29. Joaquin Abellan-Garcia, M. Iqbal Khan, Yassir M. Abbas, Vicente Martínez-Lirón, Juan S. Carvajal-Muñoz. (2023). The drying shrinkage response of recycled-waste-glass-powder-and calcium-carbonate-based ultrahigh-performance concrete. Construction and Building Materials, 379, p.131163. https://doi.org/10.1016/j.conbuildmat.2023.131163.
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