Sika® Galvashield® SM-DAS
Innovative Surface Mounted Distributed Anode Corrosion Protection System
When two dissimilar metals are coupled together in an electrolyte (i.e. concrete), the metal with the higher electronegative potential for corrosion (e.g. zinc) will corrode in preference to the more noble metal (e.g. reinforcing steel). Sika® Galvashield® SM-DAS anodes are attached to sound concrete with Sika® Galvashield® Embedding Mortar, an ionically conductive mortar then mechanically anchored to provide corrosion prevention or corrosion control to the embedded reinforcing steel. Sika® Galvashield® SM-DAS is an innovative surface mounted distributed anode system designed to provide corrosion control or cathodic protection to steel reinforced concrete structures. Sika® Galvashield® SM-DAS anode units are distributed across reinforced concrete and masonry structures to provide corrosion protection to the overall structure, or can be used to target specific sections with high corrosion risk such as chloride contaminated concrete around joints and areas with high corrosion potential. Sika® Galvashield® SM-DAS anodes contain alkali-activated mortar cast around a high purity zinc core. Once installed, the zinc anode corrodes preferentially to the surrounding steel reinforcement, thereby providing galvanic corrosion control to the embedded reinforcing steel. The quantity of zinc provided, the anode length, electrical components and installation procedures are customised to meet specific project requirements.
- Proven technology - utilises Sika® Galvashield® technology which is supported by independent test program and over 20 years of real world performance data.
- Fast installation - the surface mounted anode tray has been designed for maximum installation efficiency.
- Labour-saving - easily installed by one or two competent persons.
- Long-lasting - the designed 10 to 40 year anode life* reduces the need for future repairs (*as with all galvanic protection systems, service life is dependent upon a number of factors including reinforcing steel density, concrete conductivity, chloride ion concentration, temperature, humidity and anode spacing).
- High capacity - can provide more zinc and more current output than other galvanic anode systems.
- Design flexibility - anode design and spacing can be customised to meet project performance requirements and service life objectives.
- Convenient replacement - surface mounted anodes can be easily removed and replaced when needed.
- Economical - save time and money by targeting only the remaining areas of high corrosive risk.
- Versatile - effective in chloride contaminated and carbonated concrete. Can be used for both conventionally reinforced and prestressed or post-tensioned concrete.
- Low maintenance - requires no external power source or system monitoring.
- Measurable - anode performance can be easily monitored.
- Mechanically bonded - anchors ensure bond to structure is maintained throughout the service life of the anode.
- Fire and heat resistance - rated 5VA under UL 94, the anode housing uses uPVC material which is combustible but also naturally flame retardant and will not cause, support or encourage the development of fire.
- Cathodic protection - can be designed to meet ISO12696 and NACE / AMPP cathodic protection performance criteria.
- UV resistant - anode housing is made with uPVC which is the same material used in vinyl house siding. uPVC has excellent durability in outdoor environments, including high UV degradation resistance.