Sika Ferrogard 520 Patch

Description

Sika® FerroGard®-520 Patch 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 and / or carbonation. Sika® FerroGard®-520 Patch anodes are placed along the perimeter of the repair area and fixed to the reinforcement prior to the application of a concrete repair system. The reinforcement outside the repaired area is at greatest corrosion risk owing to the passive condition of the reinforcement within the repaired area. Sika® FerroGard®-520 Patch anodes corrode preferentially to the surrounding reinforcement offering protection against incipient corrosion damage. In addition, standard repair mortars, bonding primers and reinforcement corrosion protection coatings can be used as Sika® FerroGard®-520 Patch is placed in the parent concrete and not within the repair mortar.

USES

• 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 concrete structures both in and above the tidal zone

CHARACTERISTICS AND ADVANTAGES

• Sika® FerroGard®-520 Patch anodes corrode preferentially to the surrounding reinforcement, protecting it from further corrosion damage
• Protects against incipient anode effect outside of repaired area
• No long-term maintenance costs
• Strengthens passive film on reinforcement
• No rapid dissolution of activating components
• Quick installation—no additional concrete break out
• Bonding primers for concrete and reinforcement corrosion protection coatings can be used
• High resistivity repair mortars can be used
• Performance can be monitored
• Cost effective corrosion control solution

Cylindrical zinc core covered in an activated coating, separate white spacers and an integral titanium connecting wire.

25 anodes per box, vacuum packed in 5 separate pouches

APPLICATION

Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

Reference must be made to the Sika Method Statement: Application of Discrete Galvanic Anode using Sika® FerroGard®-500s Patch CC for further details. This is summarised below:

Within the repair area where the concrete has been removed, locate the Sika® FerroGard®-520 Patch anode along the perimeter edges of the repair at spacing’s determined by the design engineer based on steel density.

Drill holes (25 mm diameter with a depth of ~125 mm) at the specified locations and remove the dust. Pre-wet the drilled holes with water for a minimum of 15 minutes, then remove any excess water from the bottom of the holes.

Apply Sika® FerroGard®-500 Crete activating and embedment mortar into each hole with a nozzle ensuring air voids are not entrapped within the mortar. Install the Sika® FerroGard®-520 Patch anode into the mortar ensuring complete encapsulation of the anode body. Remove excess mortar from around the top of the anode and integrated wire.

Directly connect the integrated titanium wire from the anode to an adjacent cleaned area of reinforcement within the repair area by winding at least twice around the reinforcement and fixing the tail with the supplied plastic cable tie.

Electrical continuity of the Sika® FerroGard®-520 Patch anode conducting wire and the reinforcement must be confirmed.

The patch repair area must be filled and finished using a suitable Sika® repair mortar within 2 hours of inserting the Sika® FerroGard®-520 Patch anode. Alternatively, cap the hole within 2 hours with the Sika® repair mortar until the final reinstatement is undertaken. Ensure the anode is not disturbed.

The Sika® FerroGard®-520 Patch anode installation can be monitored using half-cell potential surveys, current outputs and reinforcement corrosion rate measurements.

Product Data Sheet (PDS) | Safety Data Sheet (SDS)

https://aus.sika.com/dms/getdocument.get/fcf92a5d-8ac1-4977-b159-6dfe13499475/sika_ferrogard_-520patch.pdf

Colour accuracy disclaimer: We have taken care to display the most accurate visuals of our products. However, we are not responsible for the colour accuracy of the device you are viewing our swatches on. These variations arise due to different computer monitors and devices (make, model and technology, as well as resolution, contrast and brightness control settings) in much the same way a scan will differ from an original image and a colour photocopy. Furthermore, coatings can exhibit variation in perceived colour depending on gloss level and application method. If you require a very specific colour match, please make your selection via actual swatches and colour boards available at our showroom.

Product Disclaimer: Ensure you read all product, technical and safety data sheets prior to application as liability falls on the applicator. All products must be applied in accordance with manufacturer’s recommended method.