Spray Mixes are created for the purpose of shotcreting. Shotcreting is a process where concrete is placed through a concrete pump. Here, there is the usage of a compressed airline that joins the hose which throws the concrete. Spray mixes are usually used while constructing embankments, swim pools and retaining walls. These mixes have a strength ranging from 20-50mpa.
They also have a design slump and the presence of Silica Fume. Silica fume is what helps the concrete to maintain its hold and stand vertically.