Abstract
The pozzolana activity is the main property of the active additions but, in order to select them, we have to consider - between other factors- its mineralogical composition with a great influence, not only in the active component, but also in other cement properties. In the present work we have studied 4 different Cuban natural pozzolanes, characterized with the help of X ray diffraction and with thermic and chemical analysis. The pozzolanic activity was also evaluated through a chemical and physicomechanic method. Some cements were prepared with different contents of each one of the pozzolanics, and analysed their physicomechanic and chemical properties. Finally, we found that the pozzolanics mineralogical composition has a great influence in the pozzolanic activity and in the properties of mixed cements. Also we found that it 5 possible to obtain the best resistances in the time and the smaller needs of water when the vitreous phase prevail in the additions.
Highlights
We found that the pozzolanics mineralogical composition has a great influence in the pozzolanic activity and in the properties of mixed cements
We found that it 5 possible to obtain the best resistances in the time and the smaller needs of water when the vitreous phase prevail in the additions
En las primera edades de endurecimiento, los valores obtenidos de resistencia decrecen con la adición de puzolana; con adiciones del 10% esta disminución es poco significativa en los cementos que contienen la toba de «San Benito» y «Las Carolinas» que poseen mayor contenido de fase vitrea, a partir de los 7 días, los valores de resistencias son prácticamente iguales
Summary
The pozzolana activity is the main property of the active additions but, in order to select them, we have to consider between otherfactors- its mineralogical composition with a great influence, in the active component, and in other cement properties. Some cements were prepared with different contents of each one of the pozzolanics, and analysed their physicomechanic and chemical properties. We found that the pozzolanics mineralogical composition has a great influence in the pozzolanic activity and in the properties of mixed cements. La producción de cementos con adiciones es ya una práctica común en la Industria del Cemento a nivel mundial. La actividad puzolánica es la propiedad fundamental de estos materiales, pero para la selección de una puzolana se debe considerar, entre otros factores, su composición mineralógica, que influye no sólo en los constituyentes activos, sino también en la avidez por el agua, lo cual se relaciona directamente con la resistencia de morteros y hormigones, su laborabilidad, fisuración por secado y otras propiedades. Se estudiaron 4 puzolanas de diferentes yacimientos: 1 de la región occidental, 2 de la central y 1 de la región oriental: «Los Congos», «Las Carolinas», «Tasajera», y «San Benito», respectivamente
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