... size:2'',2.5'' Zhengzhou Wet mix concrete spraying machine Applications:1. Concrete machine for tunnels,hydro-power engineering,mines, ... no fertility soil surface.3. Refractory material spraying and repair for industrial kilns or kilns’s inner liner.Features: ... cooperation, low dust consisitency, low rebound, high-strength of concrete layer, saving material and protecting environment. 2. This machine ...