Research on Pump Primers for Friction Reduction of Wet-Mix Shotcrete Based on Precreating Lubricating Layer

Table 3

Influence of mixed water type on the performance of new primers.

The type of mixture water	Apparent viscosity (mpa·s)	Coating weight (kg/m^3)	FR (%)	Contact angle (°)
Tap-water	104	0.32	31	69.4
Cement water	112	0.34	28	54.2