Published
A high unburned carbon fly ash concrete's performance characteristics
Características de desempeño de un concreto adicionado con cenizas volantes de alto nivel de inquemados
Keywords:
Fly ash, silica fume, concrete, durability, permeability, compressive strength. (en)cenizas volantes, humo de sílice, concreto, durabilidad, permeabilidad, resistencia a la compresión. (es)
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Engineering today requires that structures are strong and durable; the latter concept is a decisive factor in their design and construction. The scientific community continues developing new cementitious materials and improving traditional concrete's properties, specifically reducing permeability by incorporating materials such as pozzolans. This paper analyses the effect of fly ash (FA) added to concrete on mechanical strength regarding compression, capillary absorption and chloride permeability and their behaviour compared to concrete containing silica fume (SF). An optimum 10% mechanical strength was found for fly ash; however, this increased with addition, resulting in positive effects on durability. Fly ash had lower performance for all properties evaluated when compared to silica fume.
La ingeniería de hoy en día exige que las estructuras sean resistentes y durables, siendo esta última cualidad un factor determinante durante el diseño y la construcción de ella. En dicho sentido, el desarrollo de nuevos materiales cementantes y el mejoramiento de las propiedades de los concretos tradicionales, específicamente la reducción de la permeabilidad, mediante la incorporación de materiales tales como las puzolanas, continúa siendo objeto de estudio por parte de la comunidad científica. En el presente trabajo se analiza el efecto de las propiedades de resistencia mecánica a compresión, absorción capilar y permeabilidad a cloruros de un concreto adicionado con cenizas volantes (CV), y se compara su comportamiento respecto a mezclas adicionadas con humo de sílice (MS). Para el caso de las cenizas volantes, se encontró un porcentaje óptimo del 10% para las resistencias mecánicas; sin embargo, incrementos en la adición dan lugar a efectos positivos en las propiedades de durabilidad. En comparación con el humo de sílice, las cenizas volantes mostraron un desempeño inferior para todas las propiedades evaluadas.
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