Eddy current testing for steel fibre content in reactive powder concrete cover slabs

The steel fibre content is crucial to the mechanical properties of reactive powder concrete (RPC) cover slabs, the KON-RBL(D) steel rebar tester from Conqueror was used based on electromagnetic induction and eddy current principle. The experiment firstly studied the number of measuring points and testing angle, then tested 5 pieces of cover slabs made by experimental values, and the signal values of 27 finished cover slabs were detected and analyzed finally. and the results showed that the finalized testing scheme was 32 measuring points on both sides (16 measuring points on one side), and each measuring point was detected in the two directions of 0° and 90°. The relationship equation between the steel fiber content of the RPC cover slab and the destructive strength was proposed. Experimental results showed that proposed method can achieve the measurement of steel fibre content of RPC cover slabs to provide new design ideas for steel fibre content measurement.