Sika® FerroGard®-670

5 years from date of production 

Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +35 °C. Always refer to packaging

114 mm

70 mm

30 mm

105 g (Anode surface area: 26 450 mm²)

• Sika® FerroGard®-670
• Bridging Mortar

Other anode sizes are available with different zinc content:

>800 Ah/kg

Design of the galvanic protection system must be undertaken by an experienced qualified corrosion design engineer.

Spacing

Multiple factors must be considered to determine the spacing of Sika® FerroGard®-670 anodes, including the structure's temperature, moisture content, chloride content, steel reinforcement surface area and placement. In most applications, the spacing must not exceed 760 mm. Refer to Sika® FerroGard® anodes calculation sheet for further design information.

Reference must be made to further documentation where applicable, such as relevant method statement, application manual and installation or working instructions.

Surface Preparation - Concrete

All loose and spalled concrete must be removed in accordance with national standards and guidelines such as EN 1504-10 or ICRI Guideline No. 310.1 R-2008 making sure that enough space is available to fully encapsulate the anode with a bridging mortar.

Surface Preparation – Steel reinforcement

The surface of the steel must be prepared in accordance with national standards and guidelines such as EN 1504-10 or ICRI Guideline No. 310.1 R-2008.

Extra preparation of the steel must be carried out in the area of the anode tie wire connections to provide a bright steel finish to ensure a good electrical connection.

Steel continuity

The steel reinforcement within the repair area must be tested for continuity. DC resistance between bars must be ≤1 Ω.If discontinuous steel is present, re-establish continuity with steel tie wires.

Anode positioning

In most applications, Sika® FerroGard®-670 anodes must be positioned along the perimeter edges of the repair  and on the side or beneath the exposed reinforcement while ensuring the required level of repair mortar / concrete cover. Anodes must be positioned so the entire anode and steel reinforcement are totally covered by the repair mortar once the repair is complete.

Anode preparation

Pre-soaking the anodes in clean water for several minutes prior to installation is recommended to minimise the dehydration of the repair mortar.

Anode attachment

Securely fasten the two pairs of pre-twisted galvanised wires around the  steel reinforcement in a double wrap pattern using a suitable wire twisting tool to eliminate free movement, and to ensure a good electrical connection.

Anode electrical verification

Verify electrical connection to the steel reinforcement. DC resistance must be ≤1 Ω.

Anode embedment

The Sika® FerroGard®-670 anodes must  be encased in the appropriate Sika® low resistivity mortar < 20'000 Ω-cm (Sika MonoTop®-412 N or equivalent) ensuring complete encapsulation of the anode and wire connections.

Concrete repair

Once the bridging mortar has stiffened sufficiently to prevent movement of the anode. The appropriate Sika® low resistivity concrete repair mortar < 20 000 Ω·cm and associated system parts such as reinforcement protection coating and bonding bridge are then applied within the repair area. If the required grade of repair mortar has a higher resistivity,encase the anode and bridge the gap between the anode and the existing concrete with a low resistivity bridging mortar.

System monitoring

If required, the anode installation can be monitored using half-cell potential surveys, current outputs and reinforcement corrosion rate measurements.