Efecto combinado de nano-sílice y humo de sílice para mejorar la trabajabilidad del concreto y la resistencia a la compresión: un estudio de caso
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Varios tipos de sílice amorfa generan reacciones puzolánicas a escala micro y nano, que pueden mejorar las características macroestructurales del concreto. Sin embargo, su adición puede aumentar la viscosidad de la mezcla, disminuyendo así su trabajabilidad. En el presente trabajo se propone un montaje experimental para determinar el comportamiento de compresión y manejabilidad del concreto agregando Humo de Sílice (SF), 0.0, 6.5, 8.5, 10.0% p/b, sílice coloidal (nSi), 0.0, 0.5, 1.0, 1.5, 2.0 , 2.5 % p/b y SF-nSi combinados, 0.0-0.0, 0.2-8.5, 0.2-10 % p/b, y una amplia descripción de la literatura para mezclas de concreto con SF, nSi y SF-nSi combinados. Los resultados muestran que la adición de SF puede aumentar la resistencia a la compresión en un 12%, sin embargo, también puede conducir a una disminución en la manejabilidad de la muestra (por ejemplo, una disminución del 67% para una dosis de 10,0% p/b). Por otro lado, el nSi puede aumentar la resistencia a la compresión hasta en un 25% con una dosificación del 2,5% y puede aumentar la manejabilidad en un 78% para dosificaciones superiores al 0,5% p/p. Al combinar los dos materiales, se observó un aumento en la resistencia a la compresión, junto con una pérdida de trabajabilidad. Se propone un análisis estadístico de los datos encontrados en la literatura, destacando tendencias interesantes de comportamiento entre el SF y el nSi con la trabajabilidad y la resistencia a la compresión, así como la falta de investigación sobre los resultados del asentamiento y los efectos de los aditivos combinados en el concreto. Finalmente, se propone un breve análisis costo-beneficio de las mezclas
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Aceptado 2022-12-29
Publicado 2022-12-30
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