Comparison of two coaxial probes for the non-destructive evaluation of a steel fiber reinforced concrete layer

A coaxial probe technique for the non-destructive evaluation of steel fiber reinforced concrete is presented. An accurate open-ended coaxial probe model together with a mixing formula was used, yielding the fiber concentrations for different reinforced concrete samples. The experiments were conducted with a small and a large probe. We conclude that the proposed technique is a promising one.