Product Data Sheet Edition 30 April 2014

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Sika®

FerroGard®

-720 Reba

Discrete anode for corrosion mitigation in new construction

Product Description

Sika FerroGard-720 Reba is a discrete sacrificial anode applied to reinforcing steel

in new concrete structures exposed to attack by chloride salts.

Reinforced concrete is a porous material and as a result, exposure to chloride salts

can lead to extensive chloride diffusion in to the concrete cover and subsequent

attack on the encased reinforcing steel. This effect is accelerated at higher

temperatures.

To counter potential chloride attack, sacrificial anodes can be placed in susceptible

areas.

Sika FerroGard-720 Reba anodes corrode preferentially to the surrounding steel,

protecting it from further corrosion damage.

Uses Chloride induced corrosion prevention.

Applied to reinforced concrete structures such as bridges, car parks, coastal structures where chloride attack is an issue.

Coastal reinforced concrete structures both in and above the tidal zone.

Characteristics / Advantages

Sika FerroGard-720 Reba anodes corrode preferentially to the surrounding steel, protecting it from further corrosion damage.

Large charge capacity >450 kC*.

Works at high temperature (>50°C).

No long term maintenance costs.

Strengthens passive film.

No rapid dissolution of activating components.

Rapid installation.

Cost effective corrosion prevention solution.

Activating system dimensionally stable in dry (<40%RH) and saturated (>99% RH) conditions.

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Product Data

Form

Appearance / Colour A grey mortar cylindrical shape with a single titanium grey wire protruding from one end

Packaging 20 anodes per box

Zinc Content Product Zinc Content

Sika FerroGard-720 Reba 180 g

Storage

Storage Conditions / Shelf Life

24 months from date of production if stored in unopened, undamaged and original sealed packaging in dry conditions. Do not allow contact with oxidizing materials. Protect from moisture.

Note that beyond the shelf life, only the anode apperance will change.

Technical Data

Chemical Base Zinc alloy compound surrounded by a mortar of pH <12.4

Current density >0.2 - 2 mA/m2* in corrosive environment

Life expectancy Up to 15 to 30 years* (the lifetime of the unit can be estimated from knowledge of the anode composition and total current requirement.)

*Note Dependent on local conditions, including chloride concentration, concrete properties, humidity and temperature.

System Information

System Structure Sika FerroGard-720 Reba

Typically density of 2-9 units per m2 at a spacing of 350 – 700 mm between

anodes – refer to Sika Technical Department for advice

Ancillary Materials The following ancillary materials are also available:

Sika FerroGard MN 15 RE Manganese dioxide reference electrodes.

Monitoring equipment.

Sika FerroGard Duo anodes for treatment of chloride contaminated concrete in existing structures.

Sika FerroGard Patch anode range for extending the life of patch repairs.

Application Conditions / Limitations

Substrate Temperature +5°C min

Ambient Temperature +5°C min

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Application Instructions

Installation Application shall be in accordance with the Method Statement and is summarised as follow:

Sika FerroGard-720 Reba anodes are typically applied at a density of 2-9 units/m² concrete surfaces, at a spacing of 350-700 mm between anodes.

Sika FerroGard-720 Reba anodes are typically installed directly onto the reinforcement steel cage in new structures, prior to concrete pouring.

The individual Sika FerroGard-720 Reba units are applied to reinforcing bars at locations detailed in the design. The units are attached parallel to the rebar using the two cable tie connectors provided. To make a steel connection, the titanium connector wire is twisted around the rebar and tied with a single cable tie.

Electrical continuity between the Sika FerroGard-720 Reba anode conductor and the reinforcing steel shall be confirmed. The Sika FerroGard-720 Reba units shall then be encased in the concrete material ensuring complete coverage of the anode surface.

Notes on Application / Limitations

In order that suitable current flow and lifetime be achieved from the Sika FerroGard-720 Reba anode, certain practical considerations should be taken into account.

Concrete cover must be a minimum of 80 mm in any new construction application.

Any discontinuous steel should be either electrically bonded to or electrically isolated from the system negative.

Any cracks or delamination in the cast concrete which affect ionic current flow or allow ingress of chloride ions will affect performance of the Sika FerroGard-720 Reba unit and should thus be pre-treated.

During installation, damage to the Sika FerroGard-720 Reba unit must be avoided.

The time to achieve passivity will be dependent on site conditions. Depolarisation of treated steel will be slower in moist conditions.

Design of the galvanic protection system shall be undertaken by a local Engineer and installation guidance in accordance with their technical information.

Value Base All technical data stated in this Product Data Sheet are based on laboratory tests. Actual measured data may vary due to circumstances beyond our control.

Sika FerroGard-720 Reba is supplied under license from Concrete Preservation Technologies Limited.

Health and Safety Information

For information and advice on the safe handling, storage and disposal of chemical products, users should refer to the most recent Material Safety Data Sheet containing physical, ecological, toxicological and other safety-related data.

Design of the Sika FerroGard-720 Reba shall be undertaken by a competent designer to address any health and safety issues in the job site.

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Legal Notes The information, and, in particular, the recommendations relating to the application and end-use of Sika products, are given in good faith based on Sika's current knowledge and experience of the products when properly stored, handled and applied under normal conditions in accordance with Sika’s recommendations. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The user of the product must test the product’s suitability for the intended application and purpose. Sika reserves the right to change the properties of its products. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery. Users must always refer to the most recent issue of the local Product Data Sheet for the product concerned, copies of which will be supplied on request.

Sika Australia Pty Limited aus.sika.com

ABN 12 001 342 329 Tel: 1300 22 33 48