Evaluación de la carbonatación en especímenes elaborados con cementos de bajo carbono LC3
Fecha
2017-07
Autores
Montano Zaldívar, Rolando
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Editor
Universidad Central “Marta Abreu” de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil.
Resumen
La durabilidad es un parámetro de gran importancia a tener en cuenta en los hormigones
armados, esta se ve afectada por agentes medioambientales como el CO2, por lo que el presente
trabajo evalúa el comportamiento de la carbonatación en los especímenes de hormigón hidráulico
fabricados con cemento de bajo contenido de carbono (LC3) con respecto al cemento Portland,
ubicados en tres sitios de exposición (Punta Matamoros, Sede Universitaria y el CIDC en La
Habana) con condiciones ambientales diferentes, mediante la realización del ensayo de
fenolftaleína según la NC-355: 2004. Para comprender este fenómeno se tiene en cuenta otros
parámetros como: el tipo y contenido de cemento, la estructura de poros del material y el tiempo
de curado.
De esta forma se concluye que entre los hormigones elaborados con cemento LC3 y P-35 de una
resistencia característica de 25Mpa, los primeros presentan el mejor comportamiento en zonas de
mareas, alcanzando valores máximos de 2.9 mm; esto se debe a que los producidos con cemento
portland tiene una mayor cantidad de compuestos solubles que lixivian con el agua de mar y
afecta la estructura de poros del mismo, quitándole compuestos que le proporcionan la alcalinidad
al material.
Por otro lado, al evaluar la carbonatación en sitios donde la humedad relativa varía entre un 50 y
70% los elementos estructurales producidos con el cemento ternario presentan un comportamiento
más desfavorable, debido al por ciento de sustitución de clínquer con la consiguiente reducción de
la alcalinidad, alcanzando valores máximos de 11 mm.
The durability is a parameter of great importance to be taken into account in reinforced concrete, this is affected by environmental agents such as CO2, so the present work evaluates the carbonation behavior in hydraulic concrete specimens made with cement Low carbon content (LC3) with respect to Portland cement, located at three exposure sites (Punta Matamoros, University Headquarters and CIDC in Havana) with different environmental conditions, by performing the phenolphthalein test according to NC-355: 2004. To understand this phenomenon, other parameters are taken into account such as: the type and content of cement, the pore structure of the material and the curing time. In this way, it can be concluded that concrete made with LC3 and P-35 cement with a characteristic strength of 25Mpa, the former have a better behavior in tidal areas, reaching maximum values of 2.9 mm; This is because those produced with portland cement have a greater amount of soluble compounds that leach with sea water and affect the pore structure of the same, removing compounds that provide alkalinity to the material. On the other hand, when evaluating the carbonation in places where the relative humidity varies between 50 and 70%, the structural elements produced with the ternary cement present a more unfavorable behavior, due to the percentage of substitution of clinker with the consequent reduction of the alkalinity, Reaching maximum values of 11 mm.
The durability is a parameter of great importance to be taken into account in reinforced concrete, this is affected by environmental agents such as CO2, so the present work evaluates the carbonation behavior in hydraulic concrete specimens made with cement Low carbon content (LC3) with respect to Portland cement, located at three exposure sites (Punta Matamoros, University Headquarters and CIDC in Havana) with different environmental conditions, by performing the phenolphthalein test according to NC-355: 2004. To understand this phenomenon, other parameters are taken into account such as: the type and content of cement, the pore structure of the material and the curing time. In this way, it can be concluded that concrete made with LC3 and P-35 cement with a characteristic strength of 25Mpa, the former have a better behavior in tidal areas, reaching maximum values of 2.9 mm; This is because those produced with portland cement have a greater amount of soluble compounds that leach with sea water and affect the pore structure of the same, removing compounds that provide alkalinity to the material. On the other hand, when evaluating the carbonation in places where the relative humidity varies between 50 and 70%, the structural elements produced with the ternary cement present a more unfavorable behavior, due to the percentage of substitution of clinker with the consequent reduction of the alkalinity, Reaching maximum values of 11 mm.
Descripción
Palabras clave
Hormigón Armado, Carbonatación, Cemento, Estructura de Poros, Humedad Relativa, Tiempo de Curado y Lixiviar, Reinforced Concrete, Carbonation, Cement, Pore Structure, Relative Humidity, Curing Time and Leaching