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Influence of fibre type and content on properties of steel bar reinforced high-strength steel fibre reinforced concrete
The strength of fibres features an important influence on the load bearing capacity of HSSFRC (high-strength steel fibre reinforced concrete) without bar reinforcement. For all tested fibre amounts a better ductile material behaviour and higher load levels in the post cracking range was observed as a result of a reduced number of broken fibres in the fractured cross-sections due to a predominantly continuous and slow pull-out of the fibres from the concrete matrix. The load bearing capacity of normal- and high-strength fibres gradually increased up to deflections of 1.5 mm in combination with steel bar reinforcement but could not reach the load level of HSSFRC. In the case of higher deflections between 2.2 mm and 3.2 mm normal-strength fibres combined with longitudinal reinforcement showed a higher energy absorption capacity compared to normal-strength fibres placed in HSC because of a lower number of broken fibres and smaller crack widths at the same deformation in the post cracking range due to multiple cracks for beams with reinforcing steel. High-strength fibres featured a higher working capacity without bar reinforcement. The application of high-strength fibres in steel bar reinforced HSC seems to be unnecessary. For the design of steel bar reinforced HSSFRC constructions, the load bearing capacity in the range of low and high deformations could be overestimated if the residual loads based on the test results of the HSSFRC beams without bar reinforcement will be accepted. A reduced number of broken fibres in the failed cross-section were counted in combination with steel bar reinforcement.
Influence of fibre type and content on properties of steel bar reinforced high-strength steel fibre reinforced concrete
The strength of fibres features an important influence on the load bearing capacity of HSSFRC (high-strength steel fibre reinforced concrete) without bar reinforcement. For all tested fibre amounts a better ductile material behaviour and higher load levels in the post cracking range was observed as a result of a reduced number of broken fibres in the fractured cross-sections due to a predominantly continuous and slow pull-out of the fibres from the concrete matrix. The load bearing capacity of normal- and high-strength fibres gradually increased up to deflections of 1.5 mm in combination with steel bar reinforcement but could not reach the load level of HSSFRC. In the case of higher deflections between 2.2 mm and 3.2 mm normal-strength fibres combined with longitudinal reinforcement showed a higher energy absorption capacity compared to normal-strength fibres placed in HSC because of a lower number of broken fibres and smaller crack widths at the same deformation in the post cracking range due to multiple cracks for beams with reinforcing steel. High-strength fibres featured a higher working capacity without bar reinforcement. The application of high-strength fibres in steel bar reinforced HSC seems to be unnecessary. For the design of steel bar reinforced HSSFRC constructions, the load bearing capacity in the range of low and high deformations could be overestimated if the residual loads based on the test results of the HSSFRC beams without bar reinforcement will be accepted. A reduced number of broken fibres in the failed cross-section were counted in combination with steel bar reinforcement.
Influence of fibre type and content on properties of steel bar reinforced high-strength steel fibre reinforced concrete
Einfluss von Fasertyp und -gehalt auf die Eigenschaften von baustahlverstärkten hochfesten stahlfaserverstärkten Betonen
Hoschemacher, Klaus (author) / Mueller, Torsten (author)
2008
8 Seiten, 19 Bilder, 4 Tabellen, 3 Quellen
Conference paper
English
stahlfaserverstärkter Beton , Stahlblock , Stahlbeton , Betonstahl , hochfester Werkstoff , Ultrahochleistungsbeton , Stahlfaser , Biegefestigkeit , Zugfestigkeit , Bruchverlauf , Verarbeitungseigenschaft , geometrische Größe , Fließverhalten , Druckfestigkeit , Mikrostruktur , Werkstoffgefüge , Fasergehalt , Spannungs-Dehnungs-Verhalten
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