engleski

EXPERIMENTAL DETERMINATION of DETECTION LIMITS of IMPACT ECHO TEST METHOD

This paper presents results of experimental investigation of detection limits for Impact-echo method, used for the determination of damages in reinforced concrete structures. An experimental reinforced concrete field with embedded damages of different type and size, built in at different depths was designed and manufactured at the Institute IGH in Zagreb. Also, a device named MECHAHIT for automatic generation of ball impacts with reproducible contact time and contact force was designed and constructed. Measured responses are processed by different spectral analysis methods. Based on parametric evaluation of results, the detection limits are determined. It is shown that the use of “MECHAHIT” device and alternative spectral analysis methods improve signal-to noise ratio, extend detection limits and improve the presentation of the measurements.

IE method; non-destructive testing; reinforced concrete structures; detection probability; POD model

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