Application of Linear Polarisation Resistance Measurements and System Modelling to Corrosion Assessment of High Strength Rock Anchorages
-
Published:2007
Gareth John, Petra Ernst, 2007. "Application of Linear Polarisation Resistance Measurements and System Modelling to Corrosion Assessment of High Strength Rock Anchorages", Ground Anchorages and Anchored Structures in Service 2007: Proceedings of the two day international conference organised by the Institution of Civil Engineers and held in London on 26 and 27 November 2007, Stuart Littlejohn
Download citation file:
As part of an integrity assessment of prestressed ground anchorages installed in a gravity dam, a trial on-site corrosion monitoring investigation was carried out, in which three 122 mm diameter cores, up to 70 m deep were drilled into the dam adjacent to three of the anchorages. A novel probe arrangement was then lowered into the core (which was filled with water) and electrochemical potential, corrosion rate (LPR) and system resistance measurements made at 2 m intervals down the core.
The objective of the trial was to attempt to establish if corrosion of the tendon was active, and if that was the case to provide an estimate of the rate of corrosion of the tendon.
In order to determine the area of anchorage being polarised in the LPR measurement, a finite element analysis model of the system was developed and used in conjunction with the resistance data obtained. The rates were also compared to laboratory test results carried out on actual ground water samples taken from within the dam.
Introduction
Investigation
Results
Conclusions
References
