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32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf

CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING JOINT FILLERS WATERPROOFING WATERSTOPS ROOFING TIMBER FLOORING ALPHABETICAL INDEX Technical Data Galvashield® CC Sheet 89 Embedded galvanic anode units for corrosion control Description Galvashield CC embedded galvanic anode units are used to control on-going corrosion and to prevent the initiation of new corrosion activity in concrete structures. Galvashield CC consists of a sacrificial zinc anode core that is activated by the surrounding specially formulated precast cementitious mortar. The cylindrical unit, available in a variety of standard sizes, is quickly and easily installed into concrete that is mechanically sound but has ongoing corrosion activity. Once installed, the zinc anode corrodes preferentially to the surrounding rebar, thereby providing galvanic corrosion control to the adjacent reinforcing steel. Custom size units are available for specific project needs. Applications „ Balconies „ Columns and beams „ Bridge decks „ Parking garages „ Piers and wharfs „ Prestressed concrete „ Post-tensioning anchors Features and Benefits „ Proven technology - supported by independent test program. „ Focused protection - discrete anodes can be installed to provide corrosion protection in areas with high corrosion potentials or active corrosion. „ Economical - save money by only protecting the remaining chloride-contaminated (unrepaired) areas. „ Versatile - effective in chloride-contaminated and carbonated concrete. Can be used for both conventionally reinforced and prestressed or posttensioned concrete. „ User friendly - installation is quick and easy. „ Low maintenance - requires no external power source or system monitoring. „ Measurable - anode performance can be easily monitored if required. „ Long lasting - 10 to 20 year service 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 concentration, humidity and anode spacing. Specification Embedded galvanic anodes shall be Galvashield CC (specify product number, ie. CC65), as supplied by Parchem. Galvashield CC is a pre-manufactured unit consisting of zinc in compliance with ASTM B418-95a Type I cast around an integral bright steel tie wire for making connection to the reinforcing steel and encased in an activated cementitious mortar with pH of 14 or greater. The cementitious mortar around the zinc anode shall contain no chlorides or other corrosive constituents detrimental to the reinforcing steel as per ACI 222R. Connection wire Sacrificial Zinc Anode Core Active Cementitious Matrix Cut-away of Galvashield CC Level of protection Description Galvashield LJ Corrosion Prevention Preventing new corrosion activity from initiating 9 Corrosion Control Significantly reducing ongoing corrosion activity 9 Cathodic Protection Highest level of protection intended to stop on-going corrosion activity How It Works When two dissimilar metals are coupled together in an electrolyte, the metal with the higher potential for corrosion (more electronegative) will corrode in preference to the more noble metal. In concrete repair applications, the zinc core of the Galvashield CC unit will corrode in favor of the reinforcing steel, thus providing corrosion control to the adjacent reinforcing steel. June 2010


32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf
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