Solid NDT Rebar Locator GW50+

Instruction

Rebar detector technology with NDT method accurately test rebar location and protective layer on the reinforced concrete structure or constructional element. On the reinforced concrete structure, rebar location and protective layer thickness is an important indicator for guaranteeing the quality. It can not only directly affect physical performance about resisting tension, shearing, bend, shaking, impacting, but it also directly affect safety of construction. The protective layer is thinner, rebar is easy to rust and affect the working life. The protective layer is so thick that reducing the carrying capacity and then affect the safety.In recent years, rebar location and protective layer thickness are put more ans more high value through the evaluating for examining, diagnosis, safety. 2002-4-1 come into effect ( standards of acceptance for concrete quality on the project) that specific stipulate protective layer thickness: "Sample 2% in total and no less than 5 constructional element each for bridge, plate to test."

Theory basis

According to electromagnetic field theory, coil is strict magnetic dipole. When signal source supply alternating current, it radio electromagnetic field outside, rebar is electric dipole that can receive electric field outside and generate induction current along with rebar distribution, induction current of rebar radio electromagnetic field outside again,( namely, secondary field), original excitation coil generate induced electromotive force to make the output voltage of coil change. According to this theory, rebar detector confirm location of rebar and protective layer thickness.