Abstract
The paper presents an experimental and theoretical study on the cracking behaviour of concrete beams having longitudinal tension reinforcement and various combinations of volume and aspect ratio of steel fibers. Five full-scale beams with a concrete compressive strength of 42 MPa were tested. The mechanical properties of the steel fiber concrete under tension were determined by means of the four-point bending test specified in the Belgian standard NBN B15-238. The experimental results show that the addition of steel fibers decreases both the crack spacing and the crack width. A modification of the model of Nemegeeret al. to predict crack widths is suggested.
Résumé
Cet article présente une étude expérimentale et théorique concemant la fissuration des poutres en béton armé contenant différentes combinaisons de volume et rapport «longueur/diamètre» des fibres métalliques. Cinq poutres ayant une résistance de compression du béton de 42 MPa ont été testées. Les propriétés mécaniques du béton de fibres métalliques en tension ont été déterminées suivant l’essai de flexion de quatre points spécifié dans la norme Belge NBN B15-238. Les résultats expérimentaux montrent que l’addition des fibres métalliques au béton diminue la distace intermédiaire et l’ouverture des fissures. Une adaption du modèle de Nemegeeret al. pour calculer des ouvertures des fissures est proposée.
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Editorial Note Prof. Dr.-Ing. Lucie Vandewalle is a RILEM Senior Member. She is also the chainlady of RILEM TC 162-TDF: ‘Test and design methods for steel fibre reinforced concrete’.
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Vandewalle, L. Cracking behaviour of concrete beams reinforced with a combination of ordinary reinforcement and steel fibers. Mat. Struct. 33, 164–170 (2000). https://doi.org/10.1007/BF02479410
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DOI: https://doi.org/10.1007/BF02479410