Harnessing Two Measurement Techniques to Assess the Internal Structure of SFRC

The article describes the examination of the internal structure of concrete reinforced with steel fibers using two non-destructive measurement techniques: a method using ultrasonic waves and a method using electromagnetic induction. The ultrasonic method allowed for the determination of material defects resulting from the non-uniform distribution of fibers in the space of the tested sample bodies. The method using electromagnetic induction allowed for the identification of fiber content. Research has shown that fiber concrete, characterized by a relatively high content of steel fibers (above 1.5 % by volume), is susceptible to the formation of material discontinuities in its internal structure. This phenomenon occurs to a very small extent in concrete with steel fiber content below 1.5 %.