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When spraying, shotcrete machine for wind pressure, water pressure should be lower than the 0.4 MPa 54~880MPa 0.1 high, about the quantity of water to be brought under control, and experience gained by virtue of scoring the most appropriate water cement ratio is between 0.4 to 0.5 .

When spraying, the shotcrete machine for the wind pressure in 0.4MPa, the hydraulic pressure should be higher than about 0.1MPa the wind pressure, the watering quantity controls depending on firer's experience, the most appropriate water ratio is between 0.4~0.5.

When Jet, spray machine for wind pressure 0.4MPa, higher pressure application than the wind pressure 0.1MPa, added water from striker's experience be contained, most suitable ratio of between 0.4~0.5.

Spraying, spraying machine for wind pressure 0.4MPa, 0.1MPa water pressure should be higher than the air pressure around, plus the shooter's experience with water control, the most suitable water-cement ratio is 0.4 to 0.5.