Evaluación de la retracción por cambios de humedad relativa en hormigones. Caso de estudio Pintura C-910M Tipo I y Tipo II
Fecha
2017-07
Autores
Castro Rivas, Leinier
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Editor
Universidad Central "Marta Abreu" de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil.
Resumen
En Cuba, debido a las condiciones geográficas, se dificulta la obtención de un hormigón que satisfaga los requerimientos en cuanto a durabilidad; en la actualidad, el uso de aditivos juega un papel muy importante en la producción de hormigones y debido a ello se han logrado muchos con elevadas prestaciones. Es por ello que esta investigación se centra en la evaluación de la influencia de la variación de la humedad relativa en la retracción de las muestras elaboradas con aditivo superplastificante SRC-20 al 0.75% en combinación con pintura C-910M tipo I y tipo II como aditivo al 1% y al 3%, y como pintura en dos capas, como una medida de mitigación de los riesgos relacionados con la aparición de fisuras producto de la retracción. El trabajo realizado se divide principalmente en tres etapas: la primera teórica y bibliográfica donde se abordan los conceptos y principios generales; en la segunda se realizan ensayos al hormigón en estado fresco, precisamente el ensayo del cono de Abrams y aire ocluido; y una tercera donde se estudia el hormigón en estado endurecido, a través de los ensayos de absorción de agua por capilaridad, permeabilidad al aire, retracción, resistividad y resistencia a la compresión a las edades de 7 y 28 días. Los resultados de estos ensayos se analizan y nos brindan información de las mezclas elaboradas y del efecto de la pintura C-910M tipo I y tipo II, en las propiedades de los hormigones producidos
Due to the geographic conditions in Cuba, is quite difficult to obtain a concrete in order to satisfy the durability requirement of it. At the present time the usage of additives make an important role in the production of concretes and due to they have been achieve a lot of them with elevated benefits. That is why this research work takes into consideration the appraisal of the variation influence of the relative humidity in the retraction of sample elaborated, with superplastificant preservatives SRC-20 at 0.75% in combination with painting C-910M type I and type II as preservative to 1% and 3%, and as painting in two layers. Such a measure of mitigation of the risks related with the appearance of fissures due to the retraction. The investigation is divided into 3 stages: the first one the theoretical and bibliography where it is approached the concepts and general principles; the second one carried out rehearsals to the concrete in fresh state, in fact the rehearsal of the cone of Abrams and occluded air; and the third one where the concrete is studied in hardened state, Carrying out the rehearsals of absorption for capillarity, permeability to the air, retraction and resistance to the compression to the ages of 7 and 28 days. The results of these rehearsals are analyzed and they offer us information of the elaborated mix and the effect of the painting C-910M type I and type II, in the properties of the produced concretes.
Due to the geographic conditions in Cuba, is quite difficult to obtain a concrete in order to satisfy the durability requirement of it. At the present time the usage of additives make an important role in the production of concretes and due to they have been achieve a lot of them with elevated benefits. That is why this research work takes into consideration the appraisal of the variation influence of the relative humidity in the retraction of sample elaborated, with superplastificant preservatives SRC-20 at 0.75% in combination with painting C-910M type I and type II as preservative to 1% and 3%, and as painting in two layers. Such a measure of mitigation of the risks related with the appearance of fissures due to the retraction. The investigation is divided into 3 stages: the first one the theoretical and bibliography where it is approached the concepts and general principles; the second one carried out rehearsals to the concrete in fresh state, in fact the rehearsal of the cone of Abrams and occluded air; and the third one where the concrete is studied in hardened state, Carrying out the rehearsals of absorption for capillarity, permeability to the air, retraction and resistance to the compression to the ages of 7 and 28 days. The results of these rehearsals are analyzed and they offer us information of the elaborated mix and the effect of the painting C-910M type I and type II, in the properties of the produced concretes.
Descripción
Palabras clave
Hormigón, Retracción, Aditivos, Pinturas, Concrete, Retraction, Additives, Painting