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.
Location
Client
Completed
Structure
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.
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.
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.
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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NZ Transport Agency and Causeway Alliance
Cracking, delamination, spalling and section loss
DUOGUARD™