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Technical Dayta Sheet Compedium

CONTENTS INDEX 86 Technical CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING TIMBER FLOORING ROOFING WATERSTOPS WATERPROOFING JOINT FILLERS ALPHABETICAL Data Sheet Galvashield® XP Range Embedded Galvanic Anode Units with 2G TechnologyTM Description The Galvashield XP range of embedded galvanic anode units utilise an innovative zinc anode core design surrounded by an enhanced formulated cement-based mortar to provide corrosion mitigation to reinforced concrete structures. The anode units are alkali-activated (Type A) with an internal pH of 14 or greater to keep the zinc active over the life of the anode while being non-corrosive to reinforcing steel. The anode units utilise 2G Technology™ to provide higher current output. Once installed, the zinc anode corrodes preferentially to the adjacent reinforcing steel, thereby providing galvanic corrosion prevention or corrosion control. Applications „ Mitigates incipient anode formation (halo effect) in patch repair applications „ Bridge widening and other structure modifications „ Slab replacements, expansion joint repairs and other interfaces between new and existing concrete „ Repair of prestressed and post-tensioned concrete „ Chloride contaminated or carbonated concrete Advantages „ Proven technology - Galvashield has an extensive 10 year track record in the field „ Type A anode - alkali-activated to maintain activity of zinc while being non-corrosive to reinforcing steel „ Cast zinc core - provides high anode utilisation in addition to a secure long-term connection between the zinc and the lead wires „ Integral steel lead wires - allows for quick and convenient anode installation. Provides dependable steel-to-steel contact with no intermediate materials such as galvanising (which can corrode over time) that may compromise the long-term electrical connection „ BarFit™ design - grooved edges on Galvashield XP2 and XP4 anode units assist with secure anode placement „ Economical - provides localised protection where it is needed the most, at the interface of the repair and the remaining contaminated concrete „ Versatile - can be used for both conventionally reinforced and prestressed or post-tensioned concrete „ Low maintenance - requires no external power source or system monitoring „ Long lasting - 10 to 20 year service life* reduces the need for future repairs *As with all galvanic protection systems, service life and performance is dependent upon a number of factors including reinforcing steel density, concrete conductivity, chloride concentration, humidity and anode spacing. June 2010 Page 1 Level of Protection Description Galvashield Corrosion Prevention Mitigates initiation of new corrosion activity XP/XPT XP2/XP4 Corrosion Control Reduces ongoing corrosion activity XP2/XP4 Cathodic Protection Reduce or eliminate ongoing corrosion activity Specification Clause Embedded galvanic anodes shall be pre-manufactured with add zinc mass of zinc in compliance with ASTM B6 Special High Grade cast around a pair of steel tie wires in compliance with bright annealed ASTM A82 and encased in a highly alkaline cementitious shell with a pH of 14 or greater. The cementitious shell shall contain no added sulphate nor shall it contain chloride, bromide or other constituents that are corrosive to reinforcing steel. Anode units shall be supplied with integral unspliced wires with loop ties for tying to the reinforcing steel. June 2010


Technical Dayta Sheet Compedium
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