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2011•Austroads Bridge Conference, 8th, 2011, Sydney, New South Wales, AustraliaRequires access

Sacrificial cathodic protection of reinforced concrete bridges

Farhana Jesmin, Michael Moore, Shuo Tao, A Beedles

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Abstract

Concrete deterioration due to reinforcement corrosion poses one of the greatest risks to the integrity of the Roads and Traffic Authority's (RTA's) bridge stock. As an alternative to Impressed Current Cathodic Protection (ICCP), the RTA is assessing the viability of Sacrificial Cathodic Protection (SCP) as a cost effective remedial solution. Based on initial trial results, which demonstrated satisfactory corrosion protection, the RTA has implemented SCP as a full-scale rehabilitation technique on four bridges. Three different anode types have been installed. SCP would appear to offer 'installation cost' savings of up to 50 per cent. Results to-date indicate the satisfactory performance of each system and the predicted service life would appear to be in excess of ten years, which suggests that the solution is cost effective in terms of 'whole-of-life' costs.

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What this paper is about

Concrete deterioration due to reinforcement corrosion poses one of the greatest risks to the integrity of the Roads and Traffic Authority's (RTA's) bridge stock. As an alternative to Impressed Current Cathodic Protection (ICCP), the RTA is assessing the viability of Sacrificial Cathodic Protection (SCP) as a cost effective remedial solution. Based on initial trial results, which demonstrated satisfactory corrosion protection, the RTA has implemented SCP as a full-scale rehabilitation technique on four bridges. Three different anode types have been installed. SCP would appear to offer 'installation cost' savings of up to 50 per cent. Results to-date indicate the satisfactory performance of each system and the predicted service life would appear to be in excess of ten years, which suggests that the solution is cost effective in terms of 'whole-of-life' costs.

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Available abstract

Concrete deterioration due to reinforcement corrosion poses one of the greatest risks to the integrity of the Roads and Traffic Authority's (RTA's) bridge stock. As an alternative to Impressed Current Cathodic Protection (ICCP), the RTA is assessing the viability of Sacrificial Cathodic Protection (SCP) as a cost effective remedial solution. Based on initial trial results, which demonstrated satisfactory corrosion protection, the RTA has implemented SCP as a full-scale rehabilitation technique on four bridges. Three different anode types have been installed. SCP would appear to offer 'installation cost' savings of up to 50 per cent. Results to-date indicate the satisfactory performance of each system and the predicted service life would appear to be in excess of ten years, which suggests that the solution is cost effective in terms of 'whole-of-life' costs.

Key concepts: Cathodic protection, Corrosion, Service life, Galvanic anode, Forensic engineering, Bridge (graph theory), Engineering, Environmental science

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