Hormigón expuesto al fuego : influencia de la humedad en hormigones reforzados con fibras de polipropileno para la prevención del efecto spalling
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Archivos
Fecha
2012
Profesor/a Guía
Facultad/escuela
Idioma
es
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Título del volumen
Editor
Universidad Andrés Bello
Nombre de Curso
Licencia CC
Licencia CC
Resumen
La investigación acerca del Hormigón expuesto al fuego, influencia de la
humedad en hormigones reforzados con fibras sintéticas de polipropileno
para la prevención del Efecto Spalling tiene como objetivo principal determinar
la influencia del uso de fibras de polipropileno en el comportamiento del hormigón
y el porcentaje de humedad adecuado como una manera de reducir el efecto
spalling.
Esta investigación presenta resultados obtenidos experimentalmente acerca del
comportamiento del hormigón reforzado con fibras de polipropileno y saturado
con diferentes porcentajes de humedad para comprobar la prevención del efecto
spalling o desprendimiento de hormigón sometido al fuego. Las probetas de
hormigón fueron preparadas con 0, 1, 2 y 3 kilogramos de fibra de polipropileno
por metro cúbico de mezcla y saturadas con un 30%, 40%, 50% y 60% de
humedad. El procedimiento de ensayo utilizado no se encuentra normalizado y
para someter las muestras a fuego directo se utilizó un soplete convencional. La
pérdida de material se calculó haciendo una diferencia de peso entre la probeta
antes de ser quemada y después de ser expuesta al fuego. En los hormigones
preparados con 1, 2 y 3 kilogramos de fibra por metro cúbico se presentaron
pérdidas de material de aproximadamente un 2% en comparación con el
hormigón sin fibras que presentó pérdidas de aproximadamente un 5% luego de
ser quemados a una temperatura de aproximadamente 500ºC. Basado en los
resultados experimentales, se puede concluir que la presencia de fibras de
polipropileno efectivamente disminuye el efecto spalling, sin embargo a mayores
porcentajes de humedad igualmente se presentaron pérdidas de material aunque
no significativas, en el hormigón reforzado con fibras.
The research about Concrete exposed to fire, influence of moisture in concrete reinforced with polypropylene fibers to prevent Spalling Effect has as main objective to determine the influence of the use of polypropylene fibers on the behavior of concrete and the moisture right as a way to reduce the spalling effect. This research presents experimental results concerning the behavior of concrete reinforced with polypropylene fibers and saturated with different percentages of moisture to test the effect of preventing spalling of concrete subjected to fire. The concrete specimens were prepared with O, 1, 2 y 3 kg of polypropylene fibers per cubic meter of mixture and saturated with 30%, 40%, 50% y 60% moisture. The test procedure used is not standardized and to bum the samples to direct fire was used a conventional torch flame. Material loss was calculated by weight difference between the specimen befare being burned and after being exposed to fire. In the concretes made with 1, 2 y 3 kg of fiber per cubic meter of mixture, material losses occurred approximately 2% compared to concrete without fibers showed losses of about 5% after being burned to a temperature of about 500ºC. Based on experimental results, it can be concluded that the presence of polypropylene fibers effectively reduces the spalling effect, though at higher percentages of moisture also showed material losses but not significant in fiber reinforced concrete.
The research about Concrete exposed to fire, influence of moisture in concrete reinforced with polypropylene fibers to prevent Spalling Effect has as main objective to determine the influence of the use of polypropylene fibers on the behavior of concrete and the moisture right as a way to reduce the spalling effect. This research presents experimental results concerning the behavior of concrete reinforced with polypropylene fibers and saturated with different percentages of moisture to test the effect of preventing spalling of concrete subjected to fire. The concrete specimens were prepared with O, 1, 2 y 3 kg of polypropylene fibers per cubic meter of mixture and saturated with 30%, 40%, 50% y 60% moisture. The test procedure used is not standardized and to bum the samples to direct fire was used a conventional torch flame. Material loss was calculated by weight difference between the specimen befare being burned and after being exposed to fire. In the concretes made with 1, 2 y 3 kg of fiber per cubic meter of mixture, material losses occurred approximately 2% compared to concrete without fibers showed losses of about 5% after being burned to a temperature of about 500ºC. Based on experimental results, it can be concluded that the presence of polypropylene fibers effectively reduces the spalling effect, though at higher percentages of moisture also showed material losses but not significant in fiber reinforced concrete.
Notas
Tesis (Ingeniero Constructor)
Palabras clave
Materiales Resistentes al Fuego, Hormigón, Pruebas