Experiments and analysis of size and shape effect of UHPFRC subjected to axial and flexural tension

Author(s): B. Frettlöhr, K-H. Reineck, H-W. Reinhardt
Paper category: Symposium
Book title: RILEM-fib-AFGC International Symposium on Ultra-High Performance Fibre-Reinforced Concrete
Editor(s): F. Toutlemonde, J. Resplendino
Print ISBN: 978-2-35158-130-8
e-ISBN: 978-2-35158-131-5
Publisher: RILEM Publications S.A.R.L
Pages: 721 – 730
Total Pages: 10
Language: English

In order to analyse the size effect, several test series with two different UHPFRC were performed. Thereby identical cross sections were tested under bending and axial tension. Additionally the influence of the specimen shape (ratio width/height) was tested. The tensile tests showed a size effect and a shape influence for the elastic limit and for the tensile strength. This was critically analysed since some of the tested specimens had imperfections. Theoretical considerations based on optical fibre orientation measurements and a statistical analysis of the tensile tests concluded that possibly there is no size and no shape effect. The bending tests showed only a size effect for the elastic limit and a size and shape effect for the flexural tensile strength. Neither the theory of Weibull nor the empirical approach according to AFGC/SETRA (2002) could explain the test results. The fracture mechanics model by Frettlöhr (2011) could explain the experimentally determined size and shape influence of the flexural tensile strength. A comparison between the experiments and model exhibited low discrepancies.

Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00

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