Is Non-destructive testing in civil engineering a dynamic discipline with many applications? If yes, please share a example

Non destructive test is a method of testing existing concrete structures to assess the strength and durability of the concrete structures. In the non-destructive method of testing, without loading the specimen to failure (i.e. without destructing the concrete) we can measure the strength of the concrete

Will it be possible for someone to let me know on various methods that can be applied for OD Corrosion

Hello. I would suggest considering the use of high-frequency guided wave testing, as offered by GUL Screening technology. Here is a case study for the detection of sludge pitting in steel pipe using the HD ring (https://www.guided-ultrasonics.com/sludge/)