Introducción del cemento PP35 en la producción de hormigones estructurales en Cayo Santa María
Fecha
2017-06
Autores
Abreu Hernández, Nosly
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Editor
Universidad Central "Marta Abreu" de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil.
Resumen
El Cemento Portland Puzolánico PP35 producido por la industria de cemento cubana, tiene propiedades similares al Cemento Portland Ordinario P35, pero la presencia de tobas zeolíticas en el PP35 podría incrementar la demanda de agua en la preparación del hormigón, ya que, en las primeras horas de curado, las tobas podrían absorber mucha agua necesaria en la hidratación del cemento, y por esta razón producir fisuraciones. Por esta problemática es preciso hacer un estudio con dicho cemento para evitar estos fenómenos y lograr un hormigón que cumpla los parámetros de diseño. La introducción del cemento PP35 en la producción de hormigones de 35 MPa en las obras del Cayo Santa María demanda de un estudio de las dosificaciones para verificar que en todas las etapas de la obra cumplan con los requisitos técnicos establecidos, por lo que el presente trabajo observa el comportamiento del PP35 en las diferentes mezclas de hormigón al variar la relación agua cemento y la cantidad de este último, respectivamente, mediante el análisis y evaluación de las propiedades físico-mecánicos del hormigón fresco y endurecido, tales como: consistencia, absorción capilar, y la resistencia a compresión. Finalmente, al evaluar las diferentes muestras de hormigón se llega a estimar parámetros técnicos admisibles, a la vez que se determina la influencia de las diferentes variables en cada una de las mezclas.
PP35 Portland Puzolanic Cement produced by the Cuban cement industry has properties similar to the Ordinary Portland Cement P35, but the presence of zeolitic tobas in the PP35 could increase the water demand in the preparation of the concrete, since in the first hours Of curing, the tufts could absorb much water necessary in the hydration of the cement, and for this reason to produce cracks. Due to this problem it is necessary to make a study with this cement to avoid these phenomena and to obtain concrete that meets the design parameters. The introduction of PP35 cement in the production of concrete of 35 MPa in the works of Cayo Santa Maria demands a study of the dosages to verify that in all stages of the work they comply with the established technical requirements, reason why the present work The behavior of PP35 in the different concrete mixtures was evaluated by varying the water-cement ratio and the quantity of cement, respectively, by analyzing and evaluating the physical-mechanical properties of the fresh and hardened concrete, such as consistency, capillary absorption , And the compressive strength. Finally, when evaluating the different concrete samples, it is possible to estimate admissible technical parameters, while determining the influence of the different variables in each of the mixtures.
PP35 Portland Puzolanic Cement produced by the Cuban cement industry has properties similar to the Ordinary Portland Cement P35, but the presence of zeolitic tobas in the PP35 could increase the water demand in the preparation of the concrete, since in the first hours Of curing, the tufts could absorb much water necessary in the hydration of the cement, and for this reason to produce cracks. Due to this problem it is necessary to make a study with this cement to avoid these phenomena and to obtain concrete that meets the design parameters. The introduction of PP35 cement in the production of concrete of 35 MPa in the works of Cayo Santa Maria demands a study of the dosages to verify that in all stages of the work they comply with the established technical requirements, reason why the present work The behavior of PP35 in the different concrete mixtures was evaluated by varying the water-cement ratio and the quantity of cement, respectively, by analyzing and evaluating the physical-mechanical properties of the fresh and hardened concrete, such as consistency, capillary absorption , And the compressive strength. Finally, when evaluating the different concrete samples, it is possible to estimate admissible technical parameters, while determining the influence of the different variables in each of the mixtures.
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Palabras clave
Cemento Portland Puzolánico PP35, Producción, Hormigones Estructurales