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Case Study

Whiteadder Bridge

Whiteadder Bridge carries the B6461 over a tributary flowing into the River Tweed. The bridge deck joints had been leaking for some time depositing chloride contaminated rain water onto the large piers and abutments supporting the structure.


Berwick, UK


Northumberland County Council


April 2007



The Problem Identified

Substantial areas of spalling/loose concrete were visible along with salt deposits in certain areas. In addition to the main substructure, specific areas of the underside of the bridge deck had had been contaminated with significant levels of chloride salts.

The Solution Developed

CPT designed a DuoGuard™ 500 hybrid anode system to halt ongoing corrosion and prevent further damage to the contaminated piers and abutments. Using an external power source, an impressed current was applied to stop active corrosion and render the steel passive. The anodes were then disconnected from the power source to self-generate a galvanic current, sufficient to maintain steel passivity and control corrosion.

CPT also supplied a bespoke monitoring system, allowing the performance of the corrosion control system to be checked and supervised.

The Benefits Provided

Corrosion related deterioration of Whiteadder Bridge has been halted. After the initial power up period using an external power source the DuoGuard system is self-powered thus minimising future maintenance requirements and associated life costs.

With the use of a solar panel and modem communication, data from the DuoGuard installation can be downloaded at any time and measurements can be instigated without the need to travel to site.

Visible spalling and loose concrete
Finished pier 10 years after installation



DuoGuard™ Hybrid Anode halts reinforced concrete corrosion for targeted protection.

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MN15 Reference Electrode, Manganese Oxide electrode for monitoring structures.

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