Detection of Interfacial Flaws between Steel Plates and Concrete Members Using Thermographic Technique

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Title: Detection of Interfacial Flaws between Steel Plates and Concrete Members Using Thermographic Technique

Author(s): T. Kamada, T. Kawase, M. Kunieda, and K. Rokugo

Publication: Special Publication

Volume: 193

Issue:

Appears on pages(s): 637-658

Keywords: concrete; test; thermal distribution

Date: 8/1/2000

Abstract:
This paper describes a nondestructive method to evaluate two-dimensional size and depth of interfacial flaws between concrete members and the enclosing steel plate by the infrared thermographic technique. In this procedure, in order to investigate the influence of a defect in a thermography, liquid nitrogen was used to cool the surface of the steel plate. Its thermal distribution was measured. From these measurements, it was possible to estimate the diameter of circular defects from the calculated inflection points in the thermal distribution curve. The process to evaluate the depth of the flaws by using the relation betweenthe volume tof the flaws and proposed thermal parameters is also presented.