The purpose of this study is to formulate a steel fiber reinforced self compacting concrete (SFSCC) that has optimal rheological properties, using calcareous tuff powder as an addition and partial substitution to cement. The design of experiments method (DOE) was used to analyze the effect of fiber dosage (℅f), paste volume (V_p) and the gravel/sand ratio (G/S) on the SFSCC. A concrete rheometer is used to quantify the intrinsic rheological parameters.

The rheological results of the SFSCC based on tuff show that both the volume of the paste and the fiber dosage exert a significant influence on the flow capacity. Moreover, a total absence of interactions between the components of SFSCC (based on tuff) is observed in generating the flow. The plastic viscosity is governed exclusively by the volume of the paste.

The measured rheological parameters indicated that the fiber-reinforced self-compacting concrete (SFSCC), based on tuff, is a high yield stress self-compacting concrete (HYSCC).

The rheological optimization through the design of experiments method has allowed the identification of optimal composition factors based on rheological parameters, ensuring a targeted self-compacting behavior. The self-compacting behavior of SFSCC tested on the rheometer has been confirmed and validated at a full scale.