Maintenance of Cathodic Protection Applied to Concrete Members of Road Bridges
-From the Fact-surveys to the Formulation of the Manual-
By I. Sasaki and I. Nishizaki
Concrete Journal, Vol.58, No.2, Feb. 2020
- Synopsis
- Questionnaire surveys of road bridge managers and designers who apply cathodic protection were conducted on the current status and issues of the cathodic protection method and its maintenance in order to extract important points for maintenance. Moreover, a field survey of road bridges using cathodic protection and an in-depth survey of girders removed after long-term use were conducted, and the effectiveness and durability of cathodic protection, appearance changes and their effects, were evaluated. Based on the data acquired through the above surveys, maintenance procedures for the proper detection of damage, and the appropriate frequency and items of inspection and diagnosis were investigated. Further, a maintenance manual was formulated to make use of the obtained information for on-site maintenance. This paper covers the main points of this maintenance manual along with the current state of maintenance and the results of in-depth investigation of road bridges using cathodic protection.
- Keywords:
- Road bridge, Chloride attack, Steel corrosion, Cathodic protection, Maintenance, Manual
