What Is The Difference Between Dry Mix Shotcrete And Wet Mix Shotcrete In Concrete

What is the essential difference between a dry mix shotcrete and a wet mix shotcrete? Today, I will take everyone to analyze the five essential differences between the dry mix shotcrete and the wet mix shotcrete.

First, the wet and dry degree of the slurry is different

The concrete shotcrete slurry added to the dry mix shotcrete is dry, such as concrete, cement, etc., without adding water or adding a small amount of water. The wet mix shotcrete adds a well-mixed mixture, such as concrete, cement and water, and then sprays it out.

Second, the mix shotcrete mode is different

Since the dry mix shotcrete is made of dry concrete or cement, the spray head needs to be filled with water to ensure the spray effect and not generate too much dust. The wet mix shotcrete uses water to fully mix the concrete or cement, and then sprays it, and no water is needed at the nozzle, and no dust is generated, which ensures the working environment.

Third, the transport distance and wind pressure are different

The dry mix shotcrete has a conveying distance of up to 200 meters, and the slurry sprayed by the wet mix shotcrete is a slurry that has been stirred and viscous, so the vertical conveying distance can only reach 20-30 meters, and the horizontal conveying distance is 30-50 meters. The dry shotcrete can be sprayed with a wind pressure of 7 cubic meters, and the wind pressure of the wet mix shotcrete requires 13 cubic meters.

Fourth, the operator and security aspects are different

The dry mix shotcrete needs to occupy a large number of operators. Due to the large amount of dust generated, it not only affects the environment, but also causes serious damage to the safety production and the workers, and is not conducive to underground construction operations. Since the wet mix shotcrete has been mixed before, the slurry is not required to occupy a large amount of manpower, and it does not generate dust, and thus has little influence on workers and the environment, and is suitable for various working environments.

Fifth, the difference between rebound rate and cohesiveness

The dry shotcrete has a rebound rate of 15-50%, and it also causes poor cohesiveness, especially in underground construction, which will be deformed by the change of the earth's crust, causing splitting and destruction. The rebound rate of the wet mix shotcrete is up to 10%, and since the slurry is previously stirred according to the water-cement ratio, the cohesiveness is very high, and it is not easy to deform with the change of the earth's crust, which plays an important role in safe production. .

Do you know the difference between a dry mix shotcrete and a wet mix shotcrete?