Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

Use GIVING24 at checkout to save 20% on eCourses and books (some exclusions apply)!

51318-10861-An Indirect Impedance Measurement for Corrosion Detection in Structural Bridge Tendons

Picture for An Indirect Impedance Measurement for Corrosion Detection in Structural Bridge Tendons
Available for download

An indirect impedance technique is assessed as a possible method to detect corrosion within external post-tensioned bridge tendons. The method aims to extract the impedance of the steel-grout interface from the impedance measured at the surface of the grout.

Product Number: 51318-10861-SG
Author: Christopher L. Alexander / Mark E. Orazem
Publication Date: 2018
$0.00
$20.00
$20.00

An indirect impedance technique is assessed as a possible method to detect corrosion within external post-tensioned bridge tendons. The indirect impedance aims to extract the impedance of the steel-grout interface from the impedance measured at the surface of the grout. However, the electrode configuration required for the indirect impedance measurement yields geometry-induced frequency dispersion that confounds interpretation. A proof of concept was established for using indirect impedance to detect corrosion in post-tensioned tendons. Bench-top experiments were performed to show that the indirect impedance was sensitive to the properties of the steel and grout interface. Finite-element models were used to simulate the indirect impedance and determine how the geometry of the unusual electrode configuration influences the impedance. The indirect impedance was able to distinguish between locations of corroding steel and locations of passive steel, even if the actual damage to the steel was minimal. However, the complex nature of the grout impedance limits the indirect impedance measurement to providing only a qualitative assessment of the corrosion of bridge tendons.

 

Key words: Impedance, Corrosion Detection

An indirect impedance technique is assessed as a possible method to detect corrosion within external post-tensioned bridge tendons. The indirect impedance aims to extract the impedance of the steel-grout interface from the impedance measured at the surface of the grout. However, the electrode configuration required for the indirect impedance measurement yields geometry-induced frequency dispersion that confounds interpretation. A proof of concept was established for using indirect impedance to detect corrosion in post-tensioned tendons. Bench-top experiments were performed to show that the indirect impedance was sensitive to the properties of the steel and grout interface. Finite-element models were used to simulate the indirect impedance and determine how the geometry of the unusual electrode configuration influences the impedance. The indirect impedance was able to distinguish between locations of corroding steel and locations of passive steel, even if the actual damage to the steel was minimal. However, the complex nature of the grout impedance limits the indirect impedance measurement to providing only a qualitative assessment of the corrosion of bridge tendons.

 

Key words: Impedance, Corrosion Detection

Product tags
Also Purchased
Picture for Electrochemical Noise Measurements for Assessing Level of Corrosion Protection Being Afforded by a Coating to External Metal Structures Using a Hand-Held Portable Device
Available for download

Electrochemical Noise Measurements for Assessing Level of Corrosion Protection Being Afforded by a Coating to External Metal Structures Using a Hand-Held Portable Device

Product Number: 51318-10860-SG
Author: Michael T. Woldemedhin / Chi Lee / Brian Skerry / Douglas J. Mills
Publication Date: 2018
$20.00

A portable electrochemical noise measuring device has recently been developed to evaluate the corrosion-protective properties of anti-corrosive coatings in-service.
Picture for ASSESSING THE IMPACT OF INSULATION CHOICE ON CORROSION IN A HIGH HUMIDITY DUAL TEMPERATURE ENVIRONMENT
Available for download

51318-10862-ASSESSING THE IMPACT OF INSULATION CHOICE ON CORROSION IN A HIGH HUMIDITY DUAL TEMPERATURE ENVIRONMENT

Product Number: 51318-10862-SG
Author: Dr. Mark Swift
Publication Date: 2018
$20.00

Details of a second procedure developed by the testing centre INNCOA to assess the performance of several insulation systems with respect to the ingress of water vapour through a damaged section of the covering layer.
Picture for Case Study: Corrosion Susceptibility of Pipelines in Trenchless Installations
Available for download

51318-10850-Case Study: Corrosion Susceptibility of Pipelines in Trenchless Installations

Product Number: 51318-10850-SG
Author: Michael Snow / Amanda Harmon / Len Krissa / Karen Crippen
Publication Date: 2018
$20.00

Two drilling mud samples, taken at different HDD operations. Results demonstrated the presence of microorganism populations associated with microbiologically influenced corrosion (MIC) at one of the two test locations.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support