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Saenz, R., (2019). Estudio del concreto con fibras de polipropileno y cemento portland tipo I para A/C:0.60 [Tesis, Universidad Nacional de Ingeniería]. http://hdl.handle.net/20.500.14076/20562
Saenz, R., Estudio del concreto con fibras de polipropileno y cemento portland tipo I para A/C:0.60 [Tesis]. PE: Universidad Nacional de Ingeniería; 2019. http://hdl.handle.net/20.500.14076/20562
@misc{renati/265920,
title = "Estudio del concreto con fibras de polipropileno y cemento portland tipo I para A/C:0.60",
author = "Saenz Cunza, Robel Nau",
publisher = "Universidad Nacional de Ingeniería",
year = "2019"
}
Title: Estudio del concreto con fibras de polipropileno y cemento portland tipo I para A/C:0.60
Authors(s): Saenz Cunza, Robel Nau
Advisor(s): Barzola Gastelú, Carlos Armando
OCDE field: http://purl.org/pe-repo/ocde/ford#2.01.01
Issue Date: 2019
Institution: Universidad Nacional de Ingeniería
Abstract: Las fisuras en el concreto en estado plástico se generan por retracción superficial debido a una pérdida de humedad muy rápida, que pueden ser acrecentadas generalmente por una combinación de factores como las temperaturas del aire y del concreto, la velocidad del aire en la superficie del concreto y la humedad relativa. Las fisuras originadas en las estructuras de concreto pueden ser peligrosos dependiendo del ancho y la profundidad de la misma, y el uso al que se destinó dicha estructura.
Con la presente investigación busco reducir la formación de fisuras en estado plástico usando microfibras de polipropileno; para dicha investigación usé agregado fino de la cantera Huaycán, agregado grueso de la cantera Santa Clara, cemento portland tipo I y la microfibra Chema Fibra Ultrafina.
Se realizó diferentes ensayos en el Laboratorio de Ensayo de Materiales, empezando con el ensayo de propiedades físicas de los agregados, luego se realizó el diseño de mezcla para el concreto patrón y para tres dosificaciones diferentes de fibras por metro cúbico de mezcla; siendo estas 200 g/m3, 300g/m3 y 400g/m3; finalmente realicé ensayos en estado fresco y endurecido para los cuatro tipos de concreto. Se puso más énfasis en el ensayo de contracción restringida, dado que el objetivo de la investigación es reducir las fisuras mediante el uso de fibras.
Para el estudio de la generación de las fisuras por retracción plástica en el concreto, se realizó el ensayo de contracción restringida para el concreto patrón y tres dosificaciones de fibras (200 g/m3, 300g/m3 y 400g/m3).
Se buscó el mejor método de mezclado de las fibras para lograr una distribución tridimensional homogénea en toda la mezcla, para así maximizar su función en la reducción de las fisuras. La comparación de las fisuras generadas en el concreto patrón y las tres dosificaciones de fibras se hizo con muestras curadas por 7 días, comparando específicamente la cantidad, ancho y longitud de fisuras generadas en la superficie superior y superficie lateral del anillo de contracción.
Las fisuras superficiales y laterales disminuyen en cantidad, longitud y espesor al adicionar las fibras de polipropileno a la mezcla de concreto.
Cracks in concrete in the plastic state are generated by surface shrinkage due to a very rapid loss of moisture, which can be generally enhanced by a combination of factors such as air and concrete temperatures, air velocity at the surface of the concrete and the relative humidity. Fissures originated in concrete structures can be dangerous depending on the width and depth of the same, and the use to which the structure is intended. With this research, we seek to reduce the formation of cracks in plastic state using polypropylene microfibers (Chema Fibra Ultrafina); for this research, fine aggregate from the Huaycán quarry, coarse aggregate from the Santa Clara quarry, portland type I cement and the Chema Fibra Ultrafina microfibre was used. Different tests were carried out in the Materials Testing Laboratory, starting with the physical properties test of the aggregates, then the mixing design was made for the standard concrete and for three different dosages of fibers per cubic meter of mixture; being these 200 g / m3, 300g / m3 and 400g / m3; finally tests in fresh and hardened state were carried out for the four types of concrete. More emphasis was placed on the restricted shrinkage test, since the objective of the research is to reduce the cracks by using fibers. For the study of the generation of cracks by plastic shrinkage in concrete, the restricted shrinkage test was carried out for the standard concrete and three fiber dosages (200 g / m3, 300g / m3 and 400g / m3). The best fiber mixing method was sought to achieve a homogenous threedimensional distribution over the entire length of the mixture, in order to maximize its function in reducing cracks. The comparison of the fissures generated in the standard concrete and three fiber dosages was made with samples cured for 7 days, specifically comparing the amount, width and length of fissures generated in the upper surface and lateral surface of the contraction ring.
Cracks in concrete in the plastic state are generated by surface shrinkage due to a very rapid loss of moisture, which can be generally enhanced by a combination of factors such as air and concrete temperatures, air velocity at the surface of the concrete and the relative humidity. Fissures originated in concrete structures can be dangerous depending on the width and depth of the same, and the use to which the structure is intended. With this research, we seek to reduce the formation of cracks in plastic state using polypropylene microfibers (Chema Fibra Ultrafina); for this research, fine aggregate from the Huaycán quarry, coarse aggregate from the Santa Clara quarry, portland type I cement and the Chema Fibra Ultrafina microfibre was used. Different tests were carried out in the Materials Testing Laboratory, starting with the physical properties test of the aggregates, then the mixing design was made for the standard concrete and for three different dosages of fibers per cubic meter of mixture; being these 200 g / m3, 300g / m3 and 400g / m3; finally tests in fresh and hardened state were carried out for the four types of concrete. More emphasis was placed on the restricted shrinkage test, since the objective of the research is to reduce the cracks by using fibers. For the study of the generation of cracks by plastic shrinkage in concrete, the restricted shrinkage test was carried out for the standard concrete and three fiber dosages (200 g / m3, 300g / m3 and 400g / m3). The best fiber mixing method was sought to achieve a homogenous threedimensional distribution over the entire length of the mixture, in order to maximize its function in reducing cracks. The comparison of the fissures generated in the standard concrete and three fiber dosages was made with samples cured for 7 days, specifically comparing the amount, width and length of fissures generated in the upper surface and lateral surface of the contraction ring.
Link to repository: http://hdl.handle.net/20.500.14076/20562
Discipline: Ingeniería Civil
Grade or title grantor: Universidad Nacional de Ingeniería. Facultad de Ingeniería Civil
Grade or title: Ingeniero Civil
Juror: Moromi Nakata, Isabel
Register date: 17-Jun-2021
This item is licensed under a Creative Commons License