Fosroc Galvashield CC
Embedded zinc galvanic anodes that protect the steel surrounding a concrete patch repair, halting the “ring-anode” effect without any external power or maintenance.
What is it?
An embedded sacrificial galvanic anode: a zinc core wrapped in an alkali-activated cementitious mortar, cast into a small unit that is fixed against reinforcing steel inside a concrete repair.
Where is it used?
Reinforced concrete patch repairs in chloride-contaminated or carbonated structures bridges, jetties, car parks, water-retaining tanks, flyovers and building facades across India.
Why use it?
It prevents the incipient (ring) anode corrosion that typically restarts at the edges of a patch repair, extending the life of the repair without wiring, power or monitoring.
How is it applied?
Units are tied or wired to clean rebar inside the breakout (or set into drilled holes for the CC range), the steel connection is confirmed, and the unit is then encased in the repair mortar.
About Fosroc Galvashield CC
Fosroc Galvashield CC is an embedded galvanic (sacrificial) anode used in reinforced-concrete repair and rehabilitation. Each unit is built around a sacrificial zinc core that is surrounded by a specially formulated, alkali-activated cementitious mortar (Fosroc classifies it as a Type 2A / activated anode). When the unit is connected to the surrounding steel reinforcement, the zinc corrodes preferentially, supplying a small protective galvanic current to the rebar. In simple terms, the anode “gives itself up” so that the steel does not.
The problem Galvashield CC is engineered to solve is one of the most common reasons concrete repairs fail prematurely the incipient anode, or “ring anode”, effect. When a corroded, chloride-rich section of concrete is broken out and replaced with fresh repair mortar, the newly patched steel becomes passive (well protected), while the older steel just outside the patch remains contaminated. This electrochemical mismatch drives fresh corrosion in a ring around the repair, often within one to three years, leading to repeated re-repair cycles. By embedding Galvashield CC anodes around the perimeter of the breakout before the patch is filled, the surrounding steel is brought under galvanic protection and that ring-anode corrosion is suppressed.
For an Indian distributor context, this is a high-value, specification-driven product rather than a bulk-volume item. It is specified by structural and rehabilitation consultants on bridges, flyovers, coastal and marine structures, sewage and water-treatment assets, multi-storey car parks, and ageing RCC buildings precisely the assets across Delhi NCR, the western coastline and pan-India where chloride ingress and carbonation are accelerating reinforcement corrosion. Because the anodes are self-powered and self-regulating, they suit Indian sites where running an impressed-current cathodic protection (ICCP) system with transformer-rectifiers, cabling and monitoring would be impractical or uneconomic.
Galvashield CC sits within Fosroc’s wider Galvashield family. The CC range (CC65, CC100, CC135) is the “drill-and-place” / discrete-anode style used both inside repairs and as a grid in sound but at-risk concrete, while the Galvashield XP / XPT range is the tied-on style placed directly against exposed steel in a breakout. Space Arc Engineering positions Galvashield CC as the durable, low-maintenance corrosion-management layer that turns a one-off patch repair into a long-term rehabilitation, and pairs it with Fosroc’s Renderoc repair mortars and Dekguard / Nitocote coatings to deliver a complete repair-and-protect specification.
The technical insight
Galvashield CC works on a galvanic couple: zinc (the anode) is electrochemically less noble than steel, so when the two are connected through the concrete pore solution, zinc oxidises preferentially and feeds a protective cathodic current to the rebar. The critical engineering detail is the alkali-activated cementitious surround (Fosroc’s Type 2A matrix). Ordinary zinc passivates quickly in the high-pH environment of concrete, which would choke the protective current. The activating mortar holds the zinc in an active, dissolving state and keeps the anode-to-steel resistance low, so useful current keeps flowing throughout the service life. This self-regulating behaviour means current naturally rises where corrosion risk is higher and tapers where the steel is well protected no controller, sensors or power supply are involved, which is the defining difference from an impressed-current cathodic protection (ICCP) system.
Where it is used
- Perimeter (incipient/ring-anode) protection around concrete patch repairs to stop corrosion restarting at the patch edges
- Discrete-anode grids drilled into sound but chloride-contaminated or low-cover concrete to provide preventative galvanic protection
- Rehabilitation of chloride-attacked marine and coastal RCC bridges, jetties, sea walls and splash-zone elements
- Carbonation-induced corrosion repair on ageing building columns, beams, balconies and facades
- Corrosion management of multi-storey and basement car park decks exposed to de-icing salts or water ingress
- Repair of water-retaining and effluent structures water tanks, STP/ETP tanks and channels where wiring an ICCP system is impractical
- Protection of pre-stressed and post-tensioned concrete elements as part of a managed repair specification
Key advantages
- Stops the incipient (ring) anode effect, the most common cause of premature patch-repair failure
- Fully passive self-powered and self-regulating, with no external power, cabling, transformer-rectifier or monitoring needed
- Effectively zero maintenance once installed, with a stated anode service life of up to 20 years
- Works in both chloride-contaminated and carbonated concrete
- Suitable for conventionally reinforced as well as pre-stressed and post-tensioned concrete
- Three unit sizes (CC65, CC100, CC135) let the designer match output to steel density and congestion
- Far lower installed cost and complexity than an impressed-current cathodic protection system on small-to-medium repairs
- Integrates cleanly with Fosroc Renderoc repair mortars for a single-source repair-and-protect specification
Limitations & considerations
- Provides galvanic (sacrificial) protection only it is a corrosion-management aid, not a structural strengthening or load-restoring product
- Output is finite; for very high chloride levels or whole-element protection the design may require closer anode spacing or ICCP instead
- Requires a verified, low-resistance steel-to-steel electrical connection a poor tie/connection silently negates the protection
- Performance depends on continuous moisture in the concrete; persistently dry, low-humidity concrete reduces galvanic current
- Correct anode spacing and quantity must be designed by a competent corrosion engineer per the structure not improvised on site
- Service life is finite (up to ~20 years per design tables); it manages corrosion rather than permanently eliminating it
- Not a substitute for removing heavily chloride-contaminated or unsound concrete before repair
Selection & best practice
Have a corrosion or rehabilitation engineer design the anode type, quantity and spacing for the specific structure before ordering. On site, break out to sound concrete and expose/clean the reinforcement to bright steel (grit-blast or wire-brush to remove rust and contamination). Fix Galvashield CC units around the repair perimeter (or in the designed drilled-hole grid) and make a tight, mechanically sound steel-to-steel connection using the integral tie/connection wires; confirm electrical continuity to the rebar with a meter before casting. Fully encase each anode in a compatible cementitious repair mortar (e.g. Fosroc Renderoc) leaving no voids, since the surrounding mortar completes the circuit. Avoid epoxy or other electrically insulating coatings on the steel within the repair zone, as these will isolate the anode. Finally, protect the repaired surface with an anti-carbonation/protective coating to slow further chloride and CO2 ingress.
Specifications
| Product type | Embedded sacrificial (galvanic) anode for reinforced concrete |
| Anode core | Sacrificial zinc |
| Surrounding matrix | Alkali-activated cementitious mortar (Fosroc Type 2A / activated) |
| Unit type CC65 | Unit approx. 46 x 62 mm; minimum drilled hole 50 x 95 mm (dia x length) |
| Unit type CC100 | Unit approx. 46 x 100 mm; minimum drilled hole 50 x 130 mm (dia x length) |
| Unit type CC135 (slim) | Unit approx. 29 x 135 mm; minimum drilled hole 32 x 165 mm (dia x length) |
| Connection | Integral steel connection/tie wires for steel-to-steel electrical contact |
| Anode service life | Up to 20 years (per Fosroc design tables) |
| Suitable concrete | Chloride-contaminated and carbonated; reinforced, pre-stressed and post-tensioned |
| Power / monitoring | None required self-powered and self-regulating |
| Packaging | Supplied in boxes of 20 units with accessory pack |
| Shelf life | 12 months in original unopened boxes |
| Storage | Dry conditions, original sealed packaging |
Industry use cases
Bridges & flyovers
Patch repairs to chloride- and carbonation-affected piers, pier caps, girders and decks on highway and metro structures, with perimeter anodes to prevent repairs failing in a ring within a few years.
Marine & coastal
Rehabilitation of jetties, sea walls and splash-zone RCC along India’s coastline, where chloride attack is severe and a passive, wiring-free anode is far more practical than ICCP.
Car parks
Corrosion management of suspended decks and ramps in multi-storey and basement car parks subject to water and salt ingress, where downtime and cabling for ICCP are undesirable.
Water & wastewater
Repair of water tanks, STP/ETP structures and channels, protecting embedded steel in continuously damp concrete without electrical systems inside wet environments.
Commercial & residential buildings
Restoration of corroded columns, beams, balconies and facade elements in ageing RCC buildings across Delhi NCR, extending repair life and reducing repeat maintenance call-backs.
Industrial structures
Protection of reinforcement in process buildings, plant foundations and ageing precast/post-tensioned elements as part of a planned asset-life-extension programme.
Frequently asked questions
What does Fosroc Galvashield CC actually do?
How is Galvashield CC different from Galvashield XP?
Does it need electrical power or monitoring?
How long does Galvashield CC last?
How many anodes do I need and how are they spaced?
Can I get Galvashield CC and full specification support in India?
How we position Fosroc Galvashield CC
Galvashield CC is best understood as the corrosion-management layer of a concrete repair, not a standalone fix. It pairs naturally with Fosroc’s own repair system Renderoc HB/GP repair mortars to reinstate the section, Nitobond bonding aids, and Dekguard/Nitocote anti-carbonation coatings to slow future ingress and with the wider Galvashield range (Galvashield XP/XPT tied-on anodes for breakout repairs). Within the Fosroc line it is the discrete drill-and-place option, while Galvashield XP suits direct tie-on placement. Against alternatives, the most direct competitor in the Indian market is the Sika FerroGard / Sika galvanic anode range; Vector Corrosion Technologies (the originator of the Galvashield technology) anodes are also encountered on large infrastructure projects. Local repair-mortar systems from Dr. Fixit (Pidilite), STP Ltd and MBS are commonly used for the patching itself but do not by themselves address incipient-anode corrosion, which is exactly the gap Galvashield CC fills. For whole-element or very high chloride scenarios, an impressed-current cathodic protection (ICCP) system is the more powerful but far more complex and expensive alternative; Galvashield CC is the pragmatic, maintenance-free choice for the large middle ground of patch and zonal repairs.
Related Concrete Repair products
Source Fosroc Galvashield CC for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.