The relationship between the amplitude of the refl ected response
of Ground-Penetrating Radar pulse and the scanning angle is experimentally
investigated. It is found that amplitude of a refl ected radar wave increases when
the size of rebar increases and changes with scanning direction. The amplitude
of refl ected radar wave from a rebar with specifi c size is maximized if scanning
direction is perpendicular with the axis of reinforcing bar. Empirical formulation for
the relationship between size of rebar and amplitude of refl ected wave is proposed
based on the experimental result. The method can be modifi ed and applied for
the detection of reinforcement arrangement as well as to measure the size of
reinforcement in the actual reinforced concrete structure.

• Effect of scanning direction on amplitude of refl ected pulse radar from steel bar