Nondestructive test & Assessment Ⅱ

[1281] DEVELOPMENT OF TESTING PROCEDURE FOR MAGNETIC FLUX LEAKAGE BASED METHOD OF CORROSION DETECTION FOR REINFORCEMENT IN POST-TENSIONED CONCRETE STRUCTURES

Artur SAGRADYAN¹, Satoshi TAKAYA², Takashi YAMAMOTO², Toyoaki MIYAGAWA² (1.Kyoto University 社会基盤工学専攻 構造工学講座　構造材料学分野 2.京都大学社会基盤工学専攻　構造工学講座　構造材料学分野)

Keywords:Magnetic flux leakage, Non-destructive testing, Post-tensioned concrete, Signal processing., Steel corrosion

The presented paper discusses the basics of application of magnetic flux leakage method in testing of reinforcement steel bars of post-tensioned concrete structures. Magnetic flux leakage method utilizes magnetic properties of reinforcement steel bars and influence of various defects on their magnetic properties. Currently, magnetic flux leakage method is mainly used to detect ruptures of reinforcement steel bars in concrete. The proposed method of processing of magnetic flux leakage signal allowed to reliably detect presence of corrosion and establish its position on a specimen.