Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental Investigation of Hollow Core Slabs Made of UHPC – Fibres Orientation
ABSTRACT Segmental hollow core slabs with triangular openings were investigated in terms of a reliable production and structural performance. Models of slabs were 2 m long, 1.5 m wide and 0.3 m deep. The self-compacting UHPC with 2% of steel fibres was used. The concrete was completely produced from local constituents, in order to keep the costs competitive. The compressive strength was 140 MPa. The models were tested in bending in longitudinal direction (parallel to the openings) and in transversal direction (perpendicular to the openings). Additional tests were carried out so that the material parameters would be obtained and so that the effect of casting process on fibre distribution and orientation would be investigated. The slabs were cast in a vertical position in order to obtain good quality of all visible surfaces. The production in a steel mould was successful. The models were cut in several elements which were tested. The small beams cut from the models of the slabs in different directions were subjected to 3 point bending tests. The flexural strength was highly dependent on the direction related to pouring of concrete. The highest strength was found in the direction 45° which was slightly higher than the flexural strength in the horizontal direction, while the smallest flexural strength was found in the vertical direction. It can be concluded, that it is necessary to verify the performance of structural elements on specimens cut from the structure, since the results may differ from those measured on laboratory specimens of different size, shape and casting process.
Experimental Investigation of Hollow Core Slabs Made of UHPC – Fibres Orientation
ABSTRACT Segmental hollow core slabs with triangular openings were investigated in terms of a reliable production and structural performance. Models of slabs were 2 m long, 1.5 m wide and 0.3 m deep. The self-compacting UHPC with 2% of steel fibres was used. The concrete was completely produced from local constituents, in order to keep the costs competitive. The compressive strength was 140 MPa. The models were tested in bending in longitudinal direction (parallel to the openings) and in transversal direction (perpendicular to the openings). Additional tests were carried out so that the material parameters would be obtained and so that the effect of casting process on fibre distribution and orientation would be investigated. The slabs were cast in a vertical position in order to obtain good quality of all visible surfaces. The production in a steel mould was successful. The models were cut in several elements which were tested. The small beams cut from the models of the slabs in different directions were subjected to 3 point bending tests. The flexural strength was highly dependent on the direction related to pouring of concrete. The highest strength was found in the direction 45° which was slightly higher than the flexural strength in the horizontal direction, while the smallest flexural strength was found in the vertical direction. It can be concluded, that it is necessary to verify the performance of structural elements on specimens cut from the structure, since the results may differ from those measured on laboratory specimens of different size, shape and casting process.
Experimental Investigation of Hollow Core Slabs Made of UHPC – Fibres Orientation
Vítek, Jan L. (Autor:in) / Kohoutek, Štěpán (Autor:in) / Čítek, David (Autor:in) / Coufal, Robert (Autor:in)
06.08.2017
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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