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Concrete In Australia : September 2013
52 Concrete in Australia Vol 39 No 3 CONFERENCE TECHNICAL PAPER Queen Street Bridge to mitigate the deterioration caused by chloride induced corrosion of the steel reinforcement (9). e reinforced concrete jacket was constructed using a self compacting concrete (SCC) of grade VR450/50 (50 MPa) with a minimum of 25% fly ash of the total cementitious content and a maximum coarse aggregate size of 14 mm. In order to further enhance the protective capability of the reinforced concrete jacket, a zinc-based galvanic corrosion protection system (Galvanode DAS with self regulating voltage and current output -- first such known installation in Australia) was encapsulated within the reinforced concrete jacket (Figure 16). e effectiveness of the cathodic protection (CP) system has been monitored by testing the potentials of the steel relative to four Ag/AgCl half-cell reference electrodes embedded in Pier 1 of the bridge. e terminals of cables to anodes, steel reinforcement and the reference electrodes are grouped in a junction box fixed on western face of Pier 1. No test facilities are provided for Piers 2, 3 and 4. e monitoring measurements on the CP system are checked against the CP criteria outlined in Australian Standard AS 2832.5-2002: Cathodic protection of metals Part 5: Steel in concrete structures as follows: • 100 mV polarisation decay criterion -- e criterion for the protection of a buried structure shall be to maintain an Figure 10. Half-cell potentials of base slabs. Figure 11. Potentials of anodes in ladders installed in base slab of E90.