Effect of Steel Fiber Shape on Mechanical Properties of Concrete and Application of Wet Spray Support

In order to study the reinforcing effect of different shapes and amounts of steel fiber on concrete and better apply to roadway wet spray support, straight, wavy and concave-convex steel fibers were selected. The tensile and flexural strength of concrete with three kinds of shape steel fibers at 0, 20, 40, 60, 80, 100 kg/m³ were studied by experiments. The best shape and the amount of steel fiber are applied to the roadway wet spray support. The effect of wet-spray support of steel fiber reinforced concrete was analyzed through on-site observation. The results show that the order of tensile strength and flexural strength of steel fiber reinforced concrete with different shapes is: concave and convex> wave type> straight type. The optimum steel fiber content for tensile strength and flexural strength of steel fiber reinforced concrete is 60 kg/m³. The steel fiber concrete wet-spray support can effectively control the surrounding rock of the roadway, which is better than the general-purpose concrete spray- supporting effect.