Cathodic Protection for Prestressed Structures


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Title: Cathodic Protection for Prestressed Structures

Author(s): Gee Kin Chou and Kenneth C. Hover

Publication: Concrete International

Volume: 9

Issue: 1

Appears on pages(s): 26-30

Keywords: cathodic protection; corrosion; prestressing steels; reinforced concrete; General

Date: 1/1/1987

Cathodic protection for reinforced concrete structures has been developed during the past 20 years and has proven to be successful on many full-scale projects. In light of this success, cathodic protection is being considered for control of corrosion in prestressing steel. The differences between conventionally reinforced structures and prestressed structures, in terms of the properties and arrangement of the materials, complicates the design of cathodic protection systems for prestressed structures. Significant issues include the lack of electrical continuity in prestressing steel, the danger of hydrogen embrittlement, difficulties in monitoring corrosion activity and system performance, assuring the distribution of a protective current, and the development of appropriate performance criteria. Currently, due to the variety and unique characteristics of prestressing systems, the applicability and design of cathodic protection systems must be evaluated specifically for each structure.