What Is The Working Principle Of The Rebar Detector?
Time:2021-03-05
Portable and fast-response rebar detector can quickly detect and measure concrete depth and rebar diameter and position over a large area. This method of non-destructive testing is especially useful for repair and restoration work. How It Works Concrete element sizing or rebar placement is best done using two techniques — pulsed magnetic induction or electromagnetic waves.
It is advisable to use rebar detector before drilling, sawing or coring from ready-made reinforced concrete at depths of up to 300 mm. The combination of magnetic induction / radar technology with three-dimensional scanning allows you to detect voids, as well as foreign inclusions, including: metal and plastic pipes; fiberglass cables; wood. Based on the test results, the quality of concrete is checked, including an assessment of the curvature of the element, the uniformity of density, the depth of the reinforcement. Rebar detector can also function as wire detectors. Typical concrete reinforcement locator device: Ground penetrating radar that uses radar pulses to generate an image. Receiving and transmitting antenna. Unit for transformation of magnetic impulses into a stereoscopic image. Power supply. Screen for viewing scan results. The flow of electromagnetic radiation is used to register reflected signals from internal structures that have different density indices than the base material. The radar method uses the effect of reflection of waves that meet an obstacle in their path in the form of reinforcing rods or hidden pipes. Technological Capabilities To ensure the structural performance and durability of reinforced concrete, the location of reinforcement and its depth are critical variables. Therefore, it is important to establish the applicable range, the characteristics of the measuring device, the measurement procedure, and the necessary precautions.
When using reinforcement locators in concrete, which implement the electromagnetic induction method, the depth of the reinforcing bars usually does not exceed 200 mm, and the radar depth does not exceed 100 mm. The height and nature of the relative position of the reinforcement rods do not matter. The main standard sizes of induction locators of domestic and foreign production are adapted to the detection of steel rods with a diameter of 3 ... 50 mm.
