Efectos de la adición de microesferas huecas de vidrio en concreto hidráulico
Autores
Gómez Nemocón, Sergio Alexander
Director
Tipo de contenido
Trabajo de grado - Maestría
Idioma del documento
EspañolFecha de publicación
2019-11-29
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Resumen
En esta investigación se estudió el efecto de microesferas huecas de vidrio(HGM por sus siglas en inglés)como reemplazo parcial de cemento, en una proporción de 5% en peso de material cementante, en concreto autocompactante(SCC por sus siglas en inglés), analizando algunas propiedades en estado fresco y en estado endurecido. Para tal propósito se analizóuna mezcla control (sin reemplazo) y una mezcla con el correspondiente reemplazo de cemento por microesferas.Inicialmente, se caracterizaronlos materiales empleados, se seleccionó como metodología de diseño de mezcla el métododel ACI-237, se calibró el diseño de mezclayposteriormentese realizaron paraelestado fresco los ensayos de escurrimiento, anillo japonés, caja en L, esfuerzo de fluenciaestático y dinámicoempleando elreómetro ICAR 5000 y columna de segregación. Para el estado endurecido por su parte,se ejecutaron los ensayos deresistencia a la compresión, a la tracción, a la flexión y resistencia a la penetración de ion cloruro (Nordtest NT Build 492)El resultadoobtenido indicaque el reemplazo de cemento por HGMgeneró una mejora en las propiedades reológicasestudiadas, proporcionando mayor fluidez al material. En cuanto a las propiedades en estado endurecido, se produjo una leve reducción (inferior al 15%)con respecto a las obtenidas en la muestra control. De acuerdo con esto, las HGMpueden proyectarse como un buen reemplazo de cemento en una proporción del 5% en peso del material cementante, ya que generan un comportamiento similar al obtenidoen la muestrasin reemplazo.
Abstract. In this investigation, the effect of hollow glass microspheres (HGM) as partial replacement of cement was studied, in a proportion of 5% by weight of the cementing material, in self-compacting concrete (SCC), analyzing some properties in a fresh state and in a hardened state. For such purpose, a control mix (without replacement)and amixture with cementreplacement by HGMwere analyzed. Initially, materials used were characterized, the ACI-237 method was chosen as mix design methodology, mix design was calibrated and subsequently, for fresh state, the slump flow test, the J-ring test, the L-box test, the static and dynamic yield stress (using ICAR 5000 rheometer) test and the static segregation (using column technique) test, were carried out. For hardened state meanwhile, compression strength test, splitting tensile strength test,flexural strength (using simple beam with third-point loading) test and chloride migration coefficient from non-steady-state test (Nordtest NT Build 492), were carried out.The result obtained indicates that the replacement ofcement byHGM generatedan improvement in the rheological properties studied, providing greater fluidity to the material. As for the properties in hardened state, a slightreduction(less than 15%) with respect to those obtained in the control sample, was produced. According to this, the HGM can be projected as a good cement replacement in a proportion of 5% by weight of the cementing material, because they produce a similar behavior to that obtained in the simple without replacement.
Abstract. In this investigation, the effect of hollow glass microspheres (HGM) as partial replacement of cement was studied, in a proportion of 5% by weight of the cementing material, in self-compacting concrete (SCC), analyzing some properties in a fresh state and in a hardened state. For such purpose, a control mix (without replacement)and amixture with cementreplacement by HGMwere analyzed. Initially, materials used were characterized, the ACI-237 method was chosen as mix design methodology, mix design was calibrated and subsequently, for fresh state, the slump flow test, the J-ring test, the L-box test, the static and dynamic yield stress (using ICAR 5000 rheometer) test and the static segregation (using column technique) test, were carried out. For hardened state meanwhile, compression strength test, splitting tensile strength test,flexural strength (using simple beam with third-point loading) test and chloride migration coefficient from non-steady-state test (Nordtest NT Build 492), were carried out.The result obtained indicates that the replacement ofcement byHGM generatedan improvement in the rheological properties studied, providing greater fluidity to the material. As for the properties in hardened state, a slightreduction(less than 15%) with respect to those obtained in the control sample, was produced. According to this, the HGM can be projected as a good cement replacement in a proportion of 5% by weight of the cementing material, because they produce a similar behavior to that obtained in the simple without replacement.
Abstract
Palabras clave
Concreto autocompactante ; Microesferas huecas de vidrio ; Reemplazo de cemento ; Reología ; Propiedades del concreto en estado fresco ; Propiedades del concreto en estado endurecido ; Self-compacting concrete ; Hollow glass microspheres ; Cement replacement ; Properties of concrete in fresh state ; Properties of concrete in hardened state ; Rrheology