The purpose of the shotcrete is for the concrete spraying which has greater properties over the conventional method of applying concrete which is concrete pouring.
With the advancement of equipment also comes the advancement of the concrete material.
Since the shotcrete can be used in greater elevation, it needs to carry or bear its own weight given the height. In order for the concrete to stick or adhere during the shotcrete appication, the ratio between the cement and water is usually lower than usual.
With this shotcrete method, the concrete have higher adhesion and bond strength compared to the conventional method thus reduces the need of admixtures.
This is also to avoid sagging during the shotcrete application unlike the concrete pouring which have formworks and scaffold to support the weight or the water-cement ration during the application.
With the lower cement and water ratio, shotcrete can acquire higher compressive strength in a short span of time compared with the conventional method which needs to cure for some time.
Because of the high velocity due to the use of shotcrete, the compaction of the concrete is also carried out which increases the strength of the concrete.
Gaining high compressive strength in a shorter span of time gives you a high output which positively affects your cost and schedule.