Construction of Measurement System for Stable Infrared Thermographical Image

Abstract

The purpose of this research is to develop a new technique to measure the corrosion level of reinforcing rebar which embedded in reinforced concrete structures using infrared(IR) thermographical image. IR thermography has been used various applications for non-destructive test(NDT) area, however, IR thermographical data depend on many parameters that the assessment of reliability and stability becomes very important issue to utilize IR thermographical system. This study presents a technique to quantitatively measure the corrosion level of a reinforcing bar using proposed infrared thermography measurement system. We found out electric heating method has an important effect on active IR thermography at the connecting position between rebar and power supply. Therefore this study proposed an efficient way for grip standardization to reduce constriction resistance problem, and providing not only stable but also reliable thermal image which reveal qualitative information regarding rebar corrosion. keywords: Infrared thermography, rebar corrosion, grip standardization