Abstract:   The accurate determination of the rheological parameters of the backfilling slurry is the key to the reasonable evaluation of the pipeline transportation characteristics. At present，the rheological parameters of the backfilling slurry are mainly tested by the rheometer，with poor applicability in engineering. Based on the cone slump mould and the cylinder slump mould，combined with the rheometer test，the accuracy of the yield stress of slump drums with different shape and size was compared and analyzed. It is determined that the optimal mini-slump mould is the cylinder with shape and size of 100 mm×100 mm. On this basis，the yield stress-slump relationship model is constructed. It is verified that the model can accurately calculate the yield stress of the slurry when the dimensionless yield stress ranges from 0 to 0.1；The flow time of slurry is tested by the self-made consistency funnel to explore the relationship between plastic viscosity from rheometer and flow time. The results show that the slurry flow time has a negative correlation with the plastic viscosity at the same mass concentration. The relationship between the flow time and the plastic viscosity is not obvious when the mass concentration of slurry changes.

Key words: Keywords Backfilling slurry, Mini-slump mould, Yield stress, Consistency test funnel, Plastic viscosity