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Technical Dayta Sheet Compedium

CONTENTS INDEX 92 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® LJ Galvanic Jacket for the protection of corroding columns and piles Description The Galvashield LJ galvanic protection system is designed to provide a low cost reliable method of extending the service life of corroding columns and piles in marine or non-marine environments. The Galvashield LJ system is comprised of galvanic zinc anodes placed around the structure to be protected inside an optional FRP jacket with the anode embedded in portland cement concrete or mortar. Unlike traditional concrete jackets, epoxy grouted jackets, and wraps, the Galvashield LJ provides on-going galvanic current to address active corrosion. The system is self-powered and regulates its current output according to the corrosion rate of the steel and its operating environment. Marine jackets for tidal and splash zone protection can be provided with standard zinc mesh anodes. For this application, bulk zinc anodes are recommended for supplemental protection below mean low tide. Activated zinc anodes are supplied for jackets designed to protect areas above the tidal or splash zones or for jackets used in nonmarine applications. Either type of anode may be preinstalled inside the fiberglass jacket or the components may be supplied separately. In many cases, field installation of individual components may be simpler and more easily adapted to suit variable site conditions. The Galvashield LJ system is simple to install and most work can be completed while the structure remains in service.The system requires no maintenance, no extensive column preparation prior to installation, and restores concrete loss due to steel corrosion and concrete spalling in one operation. Galvashield LJs can be supplied as round or square jackets, flat panels or custom shapes in lengths suited for the project. Applications „ Structures subject to chloride contamination „ Harsh chemical exposure „ Prestressed concrete piling „ Steel H piles „ Bridge columns Galvashield LJ provides protection to piles Features and Benefits „ Versatile - can be used to protect steel or concrete June 2010 Page 1 structures (conventionally reinforced or prestressed/ precast) in marine and non-marine applications. Available in standard and custom sizes. „ Low maintenance - requires no external power source or system monitoring. „ Structure-specific design - each system is tailored to the environment and service life expectations. „ Less self-corrosion - zinc embedded in concrete matrix minimizes premature anode consumption. „ User friendly - installation is quick and easy. Repair spalled concrete and provide lasting protection in one step. No costly electrical work required. „ Measurable - anode performance can be easily monitored if required. „ Long Lasting - 10 to 35 year service life* as required. „ Enhanced aesthetics - FRP jackets are available in a range of colors to suit project requirements. „ Minimal downtime - system can be generally installed without major disruption of operations. * 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 mass. Level of protection Description Galvashield LJ Corrosion Prevention Preventing new corrosion activity from initiating  Corrosion Control Significantly reducing ongoing corrosion activity  Cathodic Protection Highest level of protection intended to stop on-going corrosion activity  Specification Contact Parchem for assistance in developing job-specific specifications. 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 anodes in Galvashield LJ systems will corrode in favor of the reinforcing steel, thus providing corrosion protection. June 2010


Technical Dayta Sheet Compedium
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