The use of steel fibre reinforcement in self-compacting concrete provides a way of increasing productivity as it combines the positive effects of eliminating vibration work and reducing placement of re-bars before filling the concrete in the form. In this paper a broad overview of the results so far in an ongoing project on this subject is presented. Results show that it is quite possible to achieve self-compacting properties while using steel fibre reinforcement. The toughness has been tested and shown to be equal or better than for normal fibre reinforced concrete. The fibre orientation is affected by flow direction and the fibres are well distributed. SFRSCC of various mixes has been used for walls and slabs in full-scale within the scope of the project.

Results from uniaxial tension tests of a high performance steel fibre reinforced concrete have been used with a numerical and an analytical model to predict the load-displacement curve of a four-point bend test beam. The models have been verified on results from tests performed according to ASTM C1018 -92. The analytical model was then used to simulate the behaviour of beams of different sizes. The model results show a strong dependency for the evaluated design values, or residual flexural strengths, on the size of the beams. The results implies a risk of overestimating the strength of the structure when using small test samples. Also, some aspects on the method of evaluation of the test parameters with respect to their size dependency are discussed.