Thesis CARACTERIZACION DEL COMPORTAMIENTO DE HORMIGONES REFORZADOS CON FIBRAS DE ACERO TIPO 3D, 4D Y 5D, USANDO ENSAYO ASTM C1609
Date
2016
Authors
REYES GONZÁLEZ, ÍTALO SEBASTIÁN
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Abstract
El uso de hormigón reforzado con fibras se ha masificado en las últimas décadas, en parte gracias a las herramientas tecnológicas que permiten investigar y cuantificar el efecto de las fibras en el desempeño estructural del hormigón. El principal beneficio del uso de fibras en el hormigón está en la resistencia en el régimen post agrietamiento del material, impidiendo fallas frágiles cuando el hormigón se agrieta. Una de las fibras más utilizadas son las fibras de acero Dramix©, que corresponden a fibras de relieve liso con dobleces en los extremos, para mejorar el anclaje. Este fabricante ha innovado con nuevos modelos, denominados 4D y 5D, que corresponden a fibras de un acero de mejores propiedades mecánicas y un mayor número de dobleces, con lo que esperan mejorar el comportamiento de las fibras, minimizando las cuantías de refuerzo requeridas para un mismo nivel de prestaciones.El objetivo de la presente memoria es evaluar el comportamiento de los nuevos diseños de fibras de acero, dosificadas en distintas cuantías, a través de la respuesta de hormigones reforzados con fibras sometidos a flexión.A través del ensayo normalizado ASTM-C1609 se obtendrán las curvas carga-desplazamiento para hormigones diseñados para shotcrete, reforzados con 15 kg/m3, 20kg/m3 y 25 kg/m3 de fibras de acero Dramix tipo 3D, 4D y 5D. Los resultados obtenidos permitirán evaluar el efecto de las nuevas formas de fibra utilizadas y su distinta dosificación.
The use of fiber reinforced concrete has become massive in recent decades, partly due to technological tools to investigate and quantify the effect of the fibers in the structural performance of concrete. The main benefit of using fiber in the concrete is in resistance in the post material cracking regime, preventing brittle failure when the concrete cracks. One of the most commonly used fibers are steel fibers Dramix ©, corresponding to fibers relief with smooth bends at the ends, to enhance anchoring. This manufacturer has innovated with new models, called 4D and 5D, corresponding to fibers of a steel better mechanical properties and a greater number of folds, which they hope will improve the performance of the fibers, minimizing the amounts of reinforcement required for a same level of performance.The aim herein is to evaluate the performance of new designs of steel fibers in different amounts dosed through the response of fiber reinforced concrete flexural.Through the standard test ASTM-C1609 load-displacement curves for concrete designed to shotcrete, reinforced with 15 kg / m3, 20 kg / m3 and 25 kg / m3 of steel fiber Dramix 3D, 4D and 5D type will be obtained. The results obtained enable to evaluate the impact of new forms of fiber used and their different dosage.
The use of fiber reinforced concrete has become massive in recent decades, partly due to technological tools to investigate and quantify the effect of the fibers in the structural performance of concrete. The main benefit of using fiber in the concrete is in resistance in the post material cracking regime, preventing brittle failure when the concrete cracks. One of the most commonly used fibers are steel fibers Dramix ©, corresponding to fibers relief with smooth bends at the ends, to enhance anchoring. This manufacturer has innovated with new models, called 4D and 5D, corresponding to fibers of a steel better mechanical properties and a greater number of folds, which they hope will improve the performance of the fibers, minimizing the amounts of reinforcement required for a same level of performance.The aim herein is to evaluate the performance of new designs of steel fibers in different amounts dosed through the response of fiber reinforced concrete flexural.Through the standard test ASTM-C1609 load-displacement curves for concrete designed to shotcrete, reinforced with 15 kg / m3, 20 kg / m3 and 25 kg / m3 of steel fiber Dramix 3D, 4D and 5D type will be obtained. The results obtained enable to evaluate the impact of new forms of fiber used and their different dosage.
Description
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Keywords
ASTM C1609 , COMPORTAMIENTO HRFA , FIBRAS DRAMIX , HRFA