GalvaPulse - Impercia.com.br
GalvaPulse - Impercia.com.br
GalvaPulse - Impercia.com.br
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®ROGERTECROGERTEC<strong>GalvaPulse</strong>forELECTRICAL RESIST ANCE, HALF-CELL POTENTIALS ,&CORROSION RATEFeatures• Estimation of the reinforcement corrosion rate in less than 10 seconds.• Reliable evaluation of reinforcement corrosion in anaerobic concreteenvironment.• Half-cell potential along wi th the electrical resistance of the cover lay er.• Lightweight electrode, handheld <strong>com</strong>puter and easy-to-operate software.• Durable guard ring system for focusing the current field to the reinforcement.• Measurement on uneven and rough surfaces.• Easy data export to Windows PCs for plotting of data.RogertecRua Correia de Araújo, 42 - Barra da Tijuca - Rio de JaneiroCep 22611-060 - RJ - Brasilwww.rogertec.<strong>com</strong>.<strong>br</strong> / rogertec@infolink.<strong>com</strong>.<strong>br</strong>Tel.: (21)2493-6862 / 2494-40992493-4702 / 2493-6740Fax: (21) 2493-5553
®ROGERTECROGERTEC<strong>GalvaPulse</strong>System'OverviewGermann Instruments’ <strong>GalvaPulse</strong> utilizes thegalvanostatic pulse method, which is the latesttechnique for assessing the risk of corrosion tothe reinforcement in concrete structures.Traditional corrosion mapping can lead tomisinterpretation of potential readings whenencountering an extremely wet, dense orpolymer-modified concrete that has limitedaccess to oxygen.The galvanostatic pulse method induces a shortduration anodic current pulse into the reinforcement galvaostatically via a measuringcell that consists of three elements: a counter electrode, a reference electrode and aguard ring (See next page).The applied current is usually in the range of 5 to 400µA. The typical duration of thecurrent pulse is up to 10 seconds. The reference electrode records the resultingchange in electro-chemical potential of the reinforcement as a function of polarizationtime.As with other corrosion mapping systems, the concrete cover must be exposed todetermine that each length of reinf orcement be intact electricall y. For estimating thecorrosion rate, the rebar size needs to be known.Estimating Corrosion RateBy utilizing the ohmic resistance (electricalresistance), the DC polarization resistanceover time, and the applied current, thecorrosion current can be estimated withthe Stern Geary equation.When the diameter of the corrodingreinforcement and its exposed length areknown, the confined reinforcement areacan be calculated.Faraday’s law of electrical equivalencestates that 1mA/cm2 corresponds to a cross section loss of approximately 10mm/year . The corrosion rate can be estimated b y the fo llowing equation.Corrosion Rate ~ 10.I corr/AThe corrosion rate is in µm/year .I corris the corrosion current in µA.“A” is the confined area of the reinfo rcement in cm 2 .RogertecRua Correia de Araújo, 42 - Barra da Tijuca - Rio de JaneiroCep 22611-060 - RJ - Brasilwww.rogertec.<strong>com</strong>.<strong>br</strong> / rogertec@infolink.<strong>com</strong>.<strong>br</strong>Tel.: (21)2493-6862 / 2494-40992493-4702 / 2493-6740Fax: (21) 2493-5553
®ROGERTECROGERTEC<strong>GalvaPulse</strong>'Three-element measuring cellThe design of the three-elementmeasuring cell is due to the nature of realworld RC structures. The <strong>GalvaPulse</strong>’ scounter electrode is much smaller thanthat of the reinforcement, resulting in theelectrical signal tending to vanish withincreasing cover to the reinforcement.As a result, the measured effectivepolarization resistance cannot be connotbe converted to a corrosion rate unless asecond concentric counter electrode is used. This guard ring confines the appliedcurrent to an area equivalent to the first counter electrode.PSION Workabout dataloggerA PSION Workabout handheld <strong>com</strong>puter recor ds the data, whichcan be downloaded to a Windows-based software for print out onan IBM-<strong>com</strong>patible PC. The readings can be exported to MicrosoftExcel. The suplied “<strong>GalvaPulse</strong> Data Veiwing and ReportingProgram” can graphically display the potentials, electrical resistanceand corrosion rate in 2D or 3D charts.A pulse generator to supply the applied current is mounted on theback of the PSION.To check the perf ormance of the <strong>GalvaPulse</strong>, aconcrete sample cast with a corroding rebar anda stainless steel bar is supplied with the kit.Data ViewingGraphicsCorrosion activityrepresent in coloras2D o r 3DRogertecRua Correia de Araújo, 42 - Barra da Tijuca - Rio de JaneiroCep 22611-060 - RJ - Brasilwww.rogertec.<strong>com</strong>.<strong>br</strong> / rogertec@infolink.<strong>com</strong>.<strong>br</strong>Tel.: (21)2493-6862 / 2494-40992493-4702 / 2493-6740Fax: (21) 2493-5553
®ROGERTECROGERTECSupplied sperately with kit:• Cable drum with 15 meters of cable.• Concrete sample with a corrodingrebar and a stainless steel rebar .Dimensions of sample may varywith kit.<strong>GalvaPulse</strong>RogertecRua Correia de Araújo, 42 - Barra da Tijuca - Rio de JaneiroCep 22611-060 - RJ - Brasilwww.rogertec.<strong>com</strong>.<strong>br</strong> / rogertec@infolink.<strong>com</strong>.<strong>br</strong>'GP-5000 <strong>GalvaPulse</strong> Kit contains:• PSION Workabout <strong>com</strong>puter/dataloggerwith installed <strong>GalvaPulse</strong> software andattached pulse gener ator .• Measuring cell with 6 meter cable.• Sponge for measuring cell.• Reinfo rcement locator .• Reinfo rcement conductivity meter .• Cable for data transfer to PC.• Measuring cable, banana plugs.• Two adjustable clamping pliers.• Four spare batteries for PSION.• Bottle of tap water .• 12mm and 18mm drill bits.• Emery cloth.• Two reinf orcement adaptors.• 10mm Allen key.• Hammer .• Measuring tape.• Chalk.• CD-ROM with <strong>GalvaPulse</strong> Data Viewingand Reporting Program for Windows PCManuals.• Foam-lined carrying case.Tel.: (21)2493-6862 / 2494-40992493-4702 / 2493-6740Fax: (21) 2493-5553
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