UndergroundQ I am a structural engineer working on underground structures such as tunnels and caverns. I would like to know the permissible shear strength of shotcrete to be taken for M30 Grade SFRS (M30 = 30 MPa [4350 psi] at 28 days). I would like to know more about its other properties, as well.
Shotcrete is simply a placing method for concrete. Thus, the in-place material properties are essentially the same as cast concrete. A specific value for the shear is beyond the scope of our Association because many design and material properties can affect the shear capacity. We would suggest you engage a Professional Engineer who specializes in Underground Shotcrete. You should consult our Buyers Guide to find such a consultant. ACI 506R-05, “Guide to Shotcrete”, would be a helpful primer to learn more about shotcrete.
