Impressed Current Zebra Cassette CorroDiscSurface Embedded Sacrificial Anode ZLA Roll Anode GSC Super Anode Clip On Anode Monitoring and Control Camur Conductive coating Surface mounted ribbon anode Mesh in precast stick-on shapes Ti wire in acid resistant cylinder for embedment Zinc sheet with self adhesive activator Rolled ZLA grouted in drill hole ZLA block for embedment in repair ZLA block in precast container Remote monitoring and control

An area of reinforcement becomes anodic due to chloride or carbonation ingress. Corrosion is stopped if: Oxygen at cathode stopped Full immersion Small cathode Resistance of electrolyte high Low due to chloride & water Electrons supplied from alternative anode Anodic and cathodic reaction are critical to how the cell works.

Galvanic Anode Current C u r r e n t F l o w

High life cycle cost Particularly for small projects

Zebra Anode Zebra PDR Tape Zebra PDR Concrete Wearing Surface Bond Coats Layers of a Zebra System for the wearing surface of a car park deck

Building facadeCar park capillary rise zone Balcony soffitsCar park slab

Pipe tunnel, poor accessPrestressed bridge T-Roffs Car park capillary rise area Cast insitu bridge beamRoof of Tunnel Soffit Brdige deck soffit

CorroDisc 125 – 125mm diameter circular surface applied anode typically applied on a rectangular grid to give 4-8 anodes/m 2 CorroDisc R – 60x400mm wide surface applied anode typically applied in line to give 3-4 anodes/m 2 MMO coated titanium mesh

Pressing CorroDisc R onto surface Pressing CorroDisc 125 onto surface

Bus interface Computer 1 zone system (Available for control and monitoring of trial areas). Transformer Rectifier

3 zone system with all anode beds in same location. Concrete Structure 220/240 V Power Supply

2 Zones3 Zones Right: 3 zone system where anode beds separated. Note wireless link of bus cable. Working systems. Concrete Structure

A small potential shift gives cathodic prevention, i.e. a high chloride corrosion threshold for cathodic steel. Use low output anodes for incipient anode protections. A large potential shift gives cathodic protection, i.e. immunity from corrosion for active steel. Use high out put anodes (ZLA range) for true CP and no breakout. SACP systems must provide 100mv 24hr potential decay criteria

ZAP output LiOH output Intersection of steel and anode tests gives polarisation expected from anode Test system set up

Roll Anode and GSC Super Anode derived for ZLA and both give CP meeting 100mv criteria. Roll of ZLA as applied to the surface of concrete to provide full CP meeting 100 mv criteria

BalconiesWalkwaysFacadesBridges After ZLA Application After Coating

Anode string connected to rebar 27 mm diameter Roll Anode Typical Roll Anode Installation

Anode string connected to rebar 30/20 GSC Super Anode

m 1.7m