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

Table 1

Orthogonal test proposal.

Number	A (%)	B (%)	C (%)	D (%)
1	0.25	0.5	0.1	0.2
2	0.25	0.75	0.2	0.4
3	0.25	1	0.3	0.6
4	0.5	0.5	0.2	0.6
5	0.5	0.75	0.3	0.2
6	0.5	1	0.1	0.4
7	0.75	0.5	0.3	0.4
8	0.75	0.75	0.1	0.6
9	0.75	1	0.2	0.2