Wet shotcrete has several advantages over dry shotcrete in these contexts:
Better control over the mix: The wet mix is prepared in advance, allowing for better consistency and quality control in terms of water-cement ratio, which can result in a stronger and more durable application.
Less dust: Since the material is pre-mixed with water, the wet shotcrete process produces much less dust, improving safety and air quality in the confined environment of a tunnel.
Increased adhesion: Wet shotcrete tends to bond better to the substrate compared to dry shotcrete, which is crucial in tunnel construction where the material needs to bond to the rock or concrete surface effectively.
Reduced rebound: The wet mix generally produces less rebound (the amount of material that falls off the surface rather than sticking to it), which improves material efficiency and reduces waste.
Faster application: The wet mix can be pumped and applied quickly, which can improve productivity, especially in the fast-paced work environment of tunnel construction.
In short, wet shotcrete machines are often preferred in tunnel construction for their enhanced performance, safety, and efficiency.
