Dry shotcrete machine are the main spray equipment. However, as people's environmental awareness has increased and the quality requirements for shotcrete have increased, more and more wet mix shotcrete machine have entered the use. The main advantages of the wet mix shotcrete machine.
(1) greatly reduce the dust concentration outside the machine and outside the nozzle, eliminating the harm to workers' health.
(2) High productivity. Dry concrete shotcrete machine generally do not exceed 5 m3/h. The use of wet shotcrete machine can reach 10m3/h for manual work and 20m3/h for robotic work.
(3）The rebound is low. When dry sprayed, the concrete rebound can reach 15%-50%. Wet spray technology. The rebound rate can be reduced to less than 10%.
(4) When wet spraying, because the water-cement ratio is easy to control and the degree of concrete is not high, the quality of the shotcrete can be greatly improved, and the homogeneity of the concrete can be improved. When dry-spraying, the water-cement ratio of the concrete is sprayed. The hand is adjusted according to experience and visual inspection. The quality of the concrete depends to a large extent on the correct operation of the operator.
