Evaluación de la carbonatación en hormigones elaborados con cemento de bajo carbono LC3
Fecha
2016-06-27
Autores
Licor Cebey, Adrian
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Universidad Central “Marta Abreu” de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil
Resumen
La presente investigación evalúa el comportamiento de los procesos de la carbonatación en el hormigón fabricado con cemento de bajo carbono LC3, respecto a los producidos con cemento Pórtland P-35, sometidos a diferentes condiciones ambientes: primero en una zona marina tropical y en segundo lugar en zonas aisladas con humedad relativa entre un 60 y 70%. Para la determinación de la profundidad carbonatada se emplea la técnica de la fenolftaleína, atendiendo a las normativas nacionales.
Generalmente los elementos elaborados con cementos ternarios resultan más sensibles a la carbonatación que los producidos con Cementos Pórtland Ordinarios (CPO), debido al efecto de la sustitución de clínquer con la consiguiente reducción de la alcalinidad, así lo corresponde los resultados de los ensayos realizados a los elementos fabricados en el Centro de Investigación y Desarrollo de la Construcción (CIDC) de La Habana (zona de agresividad baja) de resistencia característica 30 MPa, conservados en una zona de humedad relativa (HR) entre 60 y 70%.
Por otro lado, al evaluar los hormigones de resistencia característica de diseño de 25 MPa producidos en la Empresa de Producción Industrial (EPI) Villa Clara, y luego situados en Cayo Santa María (zona marina de agresividad ambiental muy alta), se obtiene que los elementos elaborados con LC3 exponen una profundidad carbonatada menor respecto a los hormigones producidos con cemento Pórtland, situación atípica, que puede deberse, a los elevados índices de porosidad en conjunto con los efectos de la lixiviación con mayor agresividad en los hormigones con mayor contenido de compuestos solubles como el CO2.
This investigation evaluates the behavior of processes of carbonation in the concrete made with cement low carbon LC3, compared to those produced with Portland cement P-35, under different environmental conditions: first in a tropical sea area and secondly in isolated areas with relative humidity between 60 and 70%. To determine the depth carbonated phenolphthalein technique is used, based on national regulations. Generally the elements made from ternary cements are more sensitive to carbonation than those produced with cements Portland Ordinary (CPO), due to the effect of substitution of clinker with consequent reduction of the alkalinity, so it corresponds results of tests conducted to elements manufactured at the Center for Research and Development of Construction (CIDC) in Havana (area of low aggressiveness) of 30 MPa characteristic strength, kept in a zone of relative humidity (HR) between 60 and 70%. On the other hand, when evaluating concrete characteristic design strength of 25 MPa produced in the company of Industrial Production (EPI) Villa Clara, then located in Cayo Santa Maria (marine area of high environmental aggressiveness), you get that items made with LC3 expose a carbonated depth lower compared to concrete produced with Portland cement, atypical situation, which may be due to the high levels of porosity in conjunction with the effects of leaching more aggressively in concrete with a higher content of compounds soluble as CO2.
This investigation evaluates the behavior of processes of carbonation in the concrete made with cement low carbon LC3, compared to those produced with Portland cement P-35, under different environmental conditions: first in a tropical sea area and secondly in isolated areas with relative humidity between 60 and 70%. To determine the depth carbonated phenolphthalein technique is used, based on national regulations. Generally the elements made from ternary cements are more sensitive to carbonation than those produced with cements Portland Ordinary (CPO), due to the effect of substitution of clinker with consequent reduction of the alkalinity, so it corresponds results of tests conducted to elements manufactured at the Center for Research and Development of Construction (CIDC) in Havana (area of low aggressiveness) of 30 MPa characteristic strength, kept in a zone of relative humidity (HR) between 60 and 70%. On the other hand, when evaluating concrete characteristic design strength of 25 MPa produced in the company of Industrial Production (EPI) Villa Clara, then located in Cayo Santa Maria (marine area of high environmental aggressiveness), you get that items made with LC3 expose a carbonated depth lower compared to concrete produced with Portland cement, atypical situation, which may be due to the high levels of porosity in conjunction with the effects of leaching more aggressively in concrete with a higher content of compounds soluble as CO2.
Descripción
Palabras clave
Carbonatación en Hormigones, Cementos de Bajo Carbono LC3, Cemento Pórtland P-35, Técnica de la Fenolftaleína, Empresa de Producción Industrial (EPI) Villa Clara, Cayo Santa María, Phenolphthalein