UndergroundQ I am considering the use of shotcrete as an alternative to grouted riprap for slope stabilization. The project involves a basin with varying slopes and easily erodible soils. Water will cascade down the side slopes. I was going to specify shotcrete with welded-wire reinforcement but am now considering fiber-reinforced shotcrete. Is fiber-reinforced shotcrete the better choice and, if so, is 3 in. (76 mm) thickness sufficient?
Structurally, using proper quantities of either welded wire or fibers should work well. If fibers are used, they should be specified by an engineer who has the experience to specify the type of fiber and either performance requirements or dosage levels. The advantage of fibers is that they are uniformly distributed through the section, whereas the welded-wire reinforcement can be difficult to maintain in the proper location within the pavement section. The proper thickness should also be determined by a qualified engineer, as soil and groundwater pressures can impact the required thickness.
