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

Table 5

Results of compressive strength of shotcrete.

Number			Average value (MPa)
Before pumping	38.6	38.1	38.35
After shotcreting	43.1	42.5	42.8
Average value (MPa)	40.85	40.3

compressive strength.