Inspection Guidelines for Bridge Post-Tensioning and Stay Cable Systems Using NDE Methods (2017) / Chapter Skim
Currently Skimming:
Pages 19-26
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 19... ...
19 Capabilities and Limitations of NDE Methods Introduction This chapter discusses the capabilities and the limitations of each of the NDE methods that were used for the condition assessment of the mock-up full-scale PT girder specimen and the large-scale stay cable specimens. The methods that are discussed include: • Electromagnetic methods: GPR, IRT, and ECT; • Magnetic methods: MFL, MMFM-Permanent and MMFM-Solenoid; • Mechanical wave and vibration methods: IE, UST, USE, SPV-UPV, LFUT, and sounding; • Visual inspection; • Electrochemical methods: EIS; and • Combinations of methods: GPR/USE, GPR/IE, MFL/ sounding, MFL/IE, and IRT/USE.
|
From page 20... ...
20 of the highly reflective reinforcement cage present in the anchorage zones. Infrared Thermography The primary basis for IRT inspection lies in the emissivity of individual materials within the object being examined.
|
From page 21... ...
21 • Duct location: Applicable mostly to external ducts. • Duct type: Applicable to both metal and nonmetal ducts.
|
From page 22... ...
22 • Duct type: Applicable to both metal and nonmetal ducts. • Effect of concrete cover: The effect of concrete cover is dependent on the impact.
|
From page 23... ...
23 steel highly reflects acoustic waves. This makes any object directly beneath the reinforcement undiscernible and areas in between reinforcement visible.
|
From page 24... ...
24 However, LFUT does not provide an estimate for the size of the grout defects. LFUT cannot detect strand defects.
|
From page 25... ...
25 Electrochemical Methods Electrochemical Impedance Spectroscopy EIS is an impedance technique that applies a low-amplitude voltage (alternating current) to the steel under inspection over a wide range of frequencies.
|
From page 26... ...
26 results from IRT are straightforward, interpretation of USE inspection results may require a high level of experience and education about the method. The capabilities and limitations of the individual methods presented previously apply here.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.