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Size effect on the flexural fatigue behavior of high-strength plain and fiber-reinforced concrete
Abstract This paper studies the size effect on flexural fatigue in concrete. In particular, the main objective is to evaluate how the addition and content of steel fibers affect this size effect. For this purpose, four types of concrete have been produced: plain and reinforced concrete with fiber contents of 0.3%, 0.6% and 1%. Two prismatic specimen sizes were considered: 75×75×300 mm, named S, and 150×150×600 mm, named L. All specimens were subjected to 3-point bending fatigue at the same relative stress levels up to failure. The results reveal very interesting conclusions. The fibers mitigate the size effect on fatigue life, going from a difference of three orders of magnitude in PC, to practically zero in SFRC. Furthermore, it is observed that fibers do not necessarily improve fatigue life; in fact, the trend changes depending on specimen size. Finally, it is shown that the secondary crack opening rate dCMOD/dn has a good correlation with fatigue life, explaining the dispersion of N in general and the size effect in particular.
Highlights Small specimens have higher flexural strength, both in plain and steel-fiber reinforced concrete. The addition of fibers significantly reduces the size effect in fatigue life. Fiber-reinforced concrete does not necessarily have a longer fatigue life than plain concrete. The secondary crack opening rate is a suitable parameter to explain the dispersion of fatigue life.
Size effect on the flexural fatigue behavior of high-strength plain and fiber-reinforced concrete
Abstract This paper studies the size effect on flexural fatigue in concrete. In particular, the main objective is to evaluate how the addition and content of steel fibers affect this size effect. For this purpose, four types of concrete have been produced: plain and reinforced concrete with fiber contents of 0.3%, 0.6% and 1%. Two prismatic specimen sizes were considered: 75×75×300 mm, named S, and 150×150×600 mm, named L. All specimens were subjected to 3-point bending fatigue at the same relative stress levels up to failure. The results reveal very interesting conclusions. The fibers mitigate the size effect on fatigue life, going from a difference of three orders of magnitude in PC, to practically zero in SFRC. Furthermore, it is observed that fibers do not necessarily improve fatigue life; in fact, the trend changes depending on specimen size. Finally, it is shown that the secondary crack opening rate dCMOD/dn has a good correlation with fatigue life, explaining the dispersion of N in general and the size effect in particular.
Highlights Small specimens have higher flexural strength, both in plain and steel-fiber reinforced concrete. The addition of fibers significantly reduces the size effect in fatigue life. Fiber-reinforced concrete does not necessarily have a longer fatigue life than plain concrete. The secondary crack opening rate is a suitable parameter to explain the dispersion of fatigue life.
Size effect on the flexural fatigue behavior of high-strength plain and fiber-reinforced concrete
Mena-Alonso, Álvaro (author) / González, Dorys C. (author) / Mínguez, Jesús (author) / Vicente, Miguel A. (author)
2023-01-01
Article (Journal)
Electronic Resource
English
Flexural Fatigue Strength of Plain Concrete
| British Library Online Contents | 1993
Flexural Fatigue Strength of Plain Concrete
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Flexural Behavior of High-Strength Fiber Reinforced Concrete Beams
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Flexural Fatigue of High and Ultra High Strength Fiber Reinforced Concrete
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