Evaluación de los cambios de volumen en pastas de cemento Portland P 35 con adición mineral activa LC2
Fecha
2018-06
Autores
Aparicio Ruiz, Lyannis
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Editor
Universidad Central “Marta Abreu” de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil.
Resumen
En la actualidad, las adiciones minerales son muy utilizadas ya que favorecen no solo la sustitución parcial del cemento Portland, la cual reduce la producción del clínker, sino que brinda ciertas propiedades químicas y físicas que hacen más durable el hormigón. La variación de la relación agua-cemento, el uso de aditivos retardadores del fraguado y la adición de Materiales Cementicios Suplementarios (MCS) son factores que tienen gran influencia en la hidratación del cemento y la formación de las fases de una pasta de cemento hidratada. Es por ello que esta investigación se centra en evaluar el efecto de la adición mineral activa LC2, que no es más que una mezcla de arcilla calcinada, piedra caliza y yeso, en el proceso de hidratación del cemento. El trabajo consta de varias etapas: primeramente, se realiza un estudio de toda la bibliografía relacionada con el tema; en una segunda etapa se practican ensayos de calorimetría y contracción en pastas de cemento y para el caso de las muestras de hormigón se realizan los ensayos de asentamiento y resistencia; en una tercera y última etapa se interpretan los resultados y se analizan las propiedades químicas de las pastas y las propiedades físico-mecánicas de los hormigones, ambos elaborados con un 15 y un 30% de adición mineral activa LC2. Se logra con este estudio aportar una vía de sustitución del cemento Portland por adiciones, como es el caso del LC2, que estén al alcance de la Industria de la Construcción en Cuba.
At the present time, the mineral additions are very used since they not favor alone the partial substitution of the cement Portland, which reduces the production of the clínker, but rather it offers certain chemical and physical properties that make more durable the concrete. The variation of the relationship water-cement, the use of additives and the addition of Supplementary Cementicios Material (MCS) is factors that have great influence in the hydrate of the cement and the formation of the phases of a moisturized cement pasta. It is hence that this investigation is centered in evaluating the effect of the mineral addition LC2 it activates that is not more than a mixture of roasted clay, calcareous stone and plaster, in the process of hydrate of the cement. The work consists of several stages: firstly, it is carried out a study of the whole bibliography related with the topic; in a second stage they are practiced isothermal calorimetry tests and contraction in cement pastes and for the case of the concrete samples they are carried out the consistency tests and compressive strength; in a third and last stage the results are interpreted and the chemical properties of the pastas and the physical-mechanical properties of the concretes are analyzed, both elaborated with a 15 and 30% of mineral addition LC2. It is achieved with this study to contribute a way of substitution of the cement Portland for additions, like it is the case of LC2 that they are within reach of the Industry of the Construction in Cuba.
At the present time, the mineral additions are very used since they not favor alone the partial substitution of the cement Portland, which reduces the production of the clínker, but rather it offers certain chemical and physical properties that make more durable the concrete. The variation of the relationship water-cement, the use of additives and the addition of Supplementary Cementicios Material (MCS) is factors that have great influence in the hydrate of the cement and the formation of the phases of a moisturized cement pasta. It is hence that this investigation is centered in evaluating the effect of the mineral addition LC2 it activates that is not more than a mixture of roasted clay, calcareous stone and plaster, in the process of hydrate of the cement. The work consists of several stages: firstly, it is carried out a study of the whole bibliography related with the topic; in a second stage they are practiced isothermal calorimetry tests and contraction in cement pastes and for the case of the concrete samples they are carried out the consistency tests and compressive strength; in a third and last stage the results are interpreted and the chemical properties of the pastas and the physical-mechanical properties of the concretes are analyzed, both elaborated with a 15 and 30% of mineral addition LC2. It is achieved with this study to contribute a way of substitution of the cement Portland for additions, like it is the case of LC2 that they are within reach of the Industry of the Construction in Cuba.
Descripción
Palabras clave
Cemento Portland, Piedra Caliza, Arcilla Calcinada, Yeso, Pastas de cemento