Abstract
The international construction practice reports a remarkable use and development of high performance concretes, with excellent results in the durability properties, associated with a very dense cement matrix, defined from the use of high volumes of very fine minerals additions, such as, fly ash, silica fume, metakaolin and other fine powders. For the developing countries, among others Cuba, the use of these pozzolanic additions are relatively expensive, given for the high import prices of these pozzolanic materials, thus, the utility of using the national available pozzolanic sources with proven reactivity, as a partial substitute of the Ordinary Portland Cement (OPC) contents in the concrete mixtures without its properties are affected. The present paper shows the results of the study on the influence of substitution level of Ordinary Portland Cement contents by lime – pozzolan binder in combination with chemical admixture, in the behavior of the compression strength and the durability properties of a concrete. Several levels of OPC substitution are evaluated, using zeolite as pozzolan. The results obtained prove the possibility to carry out the partial replacement of high volumes of OPC by lime – zeolite binder, without affecting the values of compression strength required and their behavior before action of the chloride ion penetration and the carbonation.
Highlights
The incidence of Ordinary Portland Cement (OPC) production emissions in global warming, the continuous and increasing interventions for repairing and reconstructing concrete structures, as well as the result of wrong designs, deficient construction and insufficient maintenance programs, call the attention of specialistsRevista Ingeniería de Construcción Vol 24 No2, Agosto de 2009 www.ing.puc.cl/ricJuan José Dopico Montes de Oca, José Fernando Martirena Hernandez, Alberto López Rodríguez, Raúl González López atención de especialistas y gobiernos, en el apremiante tema de la vida útil de las edificaciones, todo lo cual resulta un proceso muy costoso no sólo desde el punto de vista económico, sino también desde el punto de vista ecológico
For OPC substitutions in mass by approximately the 50% or more, the main contribution of the pozzolanic material is better verified as inert filler, than if high fineness pozzolan is added to the concrete mass together with the calcium hydroxide, the lime addition to the fresh mixture would contribute to a reaction of greater amount of pozzolan, so the potential of the reaction products may be increased (Mira et al.,2001; Martirena, 2004)
The lime-pozzolan mineral addition will contribute to complement the fines grading distribution; in this manner, the calcium hydroxide is able to fill the voids among cement grains and, eventually, the highly fine pozzolan may fill the very small spaces present among the small grains of the fine aggregate
Summary
La incidencia de las emisiones de la producción de cemento Pórtland en el calentamiento global, así como las continuas y crecientes intervenciones de reparación y reconstrucción en que se ven envueltas las estructuras de hormigón, como resultado de incorrectos diseños, deficiente construcción e insuficientes programas de mantenimiento, atraen cada vez mas la
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