The specifications can for troweling the shotcrete surface. Does this mean producing a steel trowel finish like that on a concrete floor?
We don't know exactly what your specifications say. Normally a floor-quality steel trowel finish on shotcrete is not wanted or needed and it would be hard to produce. It is common practice for the finisher to lightly trowel the shotcrete surface immediately after the flash coat application for the purpose of making it smooth and uniform.