Product Data Sheet Show all documents

Sika® FerroGard®-720 Reba

DISCRETE ANODE FOR CORROSION MITIGATION OF INCIPIENT ANODE ADJACENT TO CONCRETE REPAIRED AREAS and for corrosion prevention in new construction

Sika® FerroGard®-720 Reba is a zinc based discrete sacrificial anode placed inside a concrete repaired area in reinforced concrete structures which are corroding as a result of chloride ingress. Sika® FerroGard®-720 Reba anodes are placed along the perimeter of the repair area and fixed to the reinforcement prior the application of a concrete repair system. The reinforcement outside the repaired area is at greatest risk owing to the passive condition of the reinforcement within the repaired area. Sika® FerroGard®-720 Reba anodes corrode preferen-tially to the surrounding reinforcement offering protection against incipient anode damage. Sika® FerroGard®-720 Reba can also be placed at specific positions on steel reinforcement stirrups when used in new construction to prevent corrosion in marine environments.

  • Sika® FerroGard®-720 Reba anodes corrode preferen-tially to the surrounding reinforcement, offering pro-tection from further corrosion damage
  • Protection against incipient anode effect outside of repaired areas
  • No long term maintenance cost
  • Strengthens passive film on reinforcement
  • No rapid dissolution of activating components
  • Quick installation - no additional break out
  • Performance can be monitored
  • Cost effective corrosion control solution
Product Data Sheet Show all documents

Usage

  • Controlling the incipient anode effect by electrically balancing the anodic and cathodic areas of reinforcement
 
  • Targeted treatment applied to concrete repaired areas to prevent incipient corrosion damage
  • For reinforced concrete structures such as bridges, car parks, coastal structures, industrial structures and residential high rise
  • Coastal reinforced structures both in and above the tidal zones
  • Corrosion prevention in new construction

Advantages

  • Sika® FerroGard®-720 Reba anodes corrode preferen-tially to the surrounding reinforcement, offering pro-tection from further corrosion damage
  • Protection against incipient anode effect outside of repaired areas
  • No long term maintenance cost
  • Strengthens passive film on reinforcement
  • No rapid dissolution of activating components
  • Quick installation - no additional break out
  • Performance can be monitored
  • Cost effective corrosion control solution

Packaging

25 anodes per box

Colour

Zinc anode core surrounded by an activating mortar casing with an integral titanium tie wire on one side.

Product Details

Product Information

Composition

Zinc alloy compound and mortar casing of pH >14

Shelf life

5 years from date of production

Storage conditions

Product must be stores in original, unopened and undamaged sealed pack-aging in dry conditions at temperature between +5°C and +30°C. Always refer to packaging. Do not allow contact with oxidizing materials.

Length

140 mm

Diameter

40 mm

Zinc weight

165 g
System information

System structure

  • Sika® FerroGard®-720 Reba

Other anode sizes are available with different zinc contents:

Name

Zinc content

Sika® FerroGard®-710 Reba

60 g

Sika® FerroGard®-715 Reba

100 g
Technical Information

Current density

> 0,2–2 mA/m2 * in corrosive environment.

*   Dependent on local conditions, including chloride concentration, con-crete properties, humidity and temperature.

Application

Application steps

APPLICATION

Reference must also be made to the full Method Statement which is summarised below:

Control of incipient anodes

Within the repair area where the concrete has been removed,locate the Sika® FerroGard®-720 Reba anodes along the perimeter edges of the repair at spacing's determined by the design engineer based on the steel density. After pre-soaking the individual Sika® FerroGard®-720 Reba anodes, they are attached parallel or beneath the cleaned reinforcement in the location of the anodes using the conducting tie wires.

Electrical continuity of the Sika® FerroGard®-720 Reba anode conductors and the reinforcement must be con-firmed. The Sika® FerroGard®-720 Reba units must be then be encased in the relevant Sika® low resistivity bridging mortar ensuring complete coverage of the anode surface. The appropriate Sika® concrete repair system is then applied with the repair area once the bridging mortar has stiffened sufficiently to prevent movement of the anodes.

The Sika® FerroGard®-720 Reba anode installation can be monitored using half-cell potential surveys, current outputs and reinforcement corrosion rate measure-ments.

Corrosion prevention in new construction

Sika® FerroGard®-720 Reba anodes are attached to the reinforcement by the integral tie wires at regular spacing’s (refer to the Method Statement). They must be properly fixed to the bar with additional plastic tie wires to prevent the anodes being displaced during concrete casting.

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