Strengthened solid structures such as reinforced concrete structures (RCS) have been broadly used in structural building due to their ideal properties like high-quality strength, toughness and adaptability. However, due to the presence of steel in the form of rebar in RCS, they are susceptible to premature corrosion which drastically reduces its durability. It is therefore important to detect this corrosion at an early stage to avoid fatal repercussions. However, it is generally not possible to detect this corrosion of rebar just by visual inspection. Active Thermography-based Nondestructive Testing (ATNDT) has emerged as one of the powerful techniques for this purpose and has seen a lot of advancements to improve its efficacy for monitoring of cracks and corrosion in rebar. One such advancement has been the use of Linear Frequency Modulated Thermography (LFMT). However, LFMT has limitations in the form of lower contrast of visibility of defects and depth detection capability. This paper introduces the use of Digital Frequency Modulated Thermography (DFMT) for RCS inspection. The results obtained from the Correlation images and Time Domain Phase Images clearly show the effectiveness of this approach in removing the drawbacks of LFMT for RCS inspection.
Health Monitoring of Civil Structures by Pulse Compression-Based Digital Frequency Modulated Thermography
Lecture Notes in Civil Engineering
2020-09-28
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Digital frequency modulated thermograph , Reinforced concrete structures , Active thermograph-based nondestructive testing , Pulse compression correlation technique Engineering , Building Construction and Design , Geotechnical Engineering & Applied Earth Sciences , Transportation Technology and Traffic Engineering , Geoengineering, Foundations, Hydraulics , Construction Management , Remote Sensing/Photogrammetry
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