Abstract
A simple, economical and practical impact resistance test method has been developed for high strength fiber reinforced concrete (HSFRC). The results indicated that there is a logarithmic relation between flexural toughness energy (E FT ) and impact energy (E l ) for FRC In this study, three different aspect ratios of hooked-end fibers, namely, 30/0.50; 60/0.80 and 50/0.60 length/diameter (mm/mm) were used. Fibers were added to concrete in four different volume percentages of 0.5, 1.0, 1.5 and 2.0 %. From the results it can be said that fibers in high strength concrete improve impact resistance and flexural toughness of concrete. Also a good correlation between flexural toughness energy and impact energy has been established.
Highlights
High strength concrete is defined as concrete having compressive cylinder strength above the present existing limits in national codes, i.e. about 60 MPa, and up to 130 MPa, the practical upper limit for concretes with ordinary aggregates (J)
High strength concrete is more brittle than normal concrete; the higher the compressive strength of concrete the lower its ductility
La definición de tenacidad es una medida de la capacidad de absorción de energía, y se utiliza para caracterizar las posibilidades que posee el hormigón reforzado con fibras de resistencia a la fractura, cuando éste está sujeto a cargas estáticas, dinámicas y de impacto
Summary
High strength concrete is defined as concrete having compressive cylinder strength above the present existing limits in national codes, i.e. about 60 MPa, and up to 130 MPa, the practical upper limit for concretes with ordinary aggregates (J). High strength concrete is more brittle than normal concrete; the higher the compressive strength of concrete the lower its ductility. La ventaja de la fibra de acero en el hormigón viene dada por la resistencia al impacto o la resistencia dinámica, que es mucho más alta que en un hormigón normal, además de mejorar otras propiedades mecánicas del hormigón de alta resistencia, como pueden ser la tenacidad y la resistencia a tracción. La definición de tenacidad es una medida de la capacidad de absorción de energía, y se utiliza para caracterizar las posibilidades que posee el hormigón reforzado con fibras de resistencia a la fractura, cuando éste está sujeto a cargas estáticas, dinámicas y de impacto. Por cuanto a la capacidad de absorción de la energía se refiere, puede calcularse como el área bajo la curva de carga-fiecha a flexión, que es la energía total absorbida antes de completarse la separación de la muestra
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