Relationships between fibre distribution, workability and the mechanical properties of SFRC applied to precast roof elements

A series of 40 precast prestressed roof el- ements was cast, employing a self-compacting steel fibre reinforced concrete (SCSFRC). They are being used in an industrial building. The fibre distribution within the roof elements was investigated by means of a suitable test procedure and correlated with results obtained from cube samples drawn from the batches and tested in the fresh state. Companion slabs were also cast and tested under four point bending, in order to study the correlation between fibre distribution and the mechanical properties of the composite. The work presented here analyses the correlation between fibre distribution, workability and mechanical properties of steel fibre reinforced concrete (SFRC) with the aim of optimising both its fresh- and hardened-state properties for a series production of precast SFRC roof elements.