1. Embedded Corrosion Instrument
Presented By: ElectraWatch, Inc. Presented To: Vanasse Hangen Brustlin, Inc.
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2. Model ECI-1 Embedded Corrosion Monitoring Instrument
An Innovative Approach to Long Term Corrosion Monitoring in Steel Reinforced Concrete Structures
(U.S. Patent 6,690,182 and Foreign Patents Pending)
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3. The ECI-1 Development Team
Dr. Robert G. Kelly – Professor of Materials Science and Engineering, University of Virginia
Mr. Robert A. Ross – Electrical Engineering and President, Virginia Technologies, Inc.
Mr. J. Kurt Hudson – Electrical Engineering and Laboratory Engineer, Virginia Technologies, Inc.
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4. What is the ECI-1
The ECI-1 is a fully embeddable instrument for monitoring corrosion of reinforcement steel in concrete structures.
The ECI-1 is a self contained instrument including electrodes, electronics, and digital network interface all contained in a single embedded package.
As compared to other products, the ECI-1 is not simply a “corrosion probe.”
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5. ECI-1 Corrosion Measurement Parameters
ECI-1 Measurement Types:
Polarization Resistance
Resistivity
Open Circuit Potential
Chloride Level
Temperature
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7. ECI-1 Cutaway View
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8. The Advantages of Local Electronics
The ECI-1 approach allows the leads connecting the low level analog electrode signals to the signal processing electronics to be kept short (approximately 1 inch).
Short analog signal leads allow for a higher signal to noise ratio and more accurate and repeatable measurements.
Other “corrosion probe” products produce analog signals that can be interrogated using electronic devices external to the structure. Since these signals are analog, the useful connection length is limited.
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9. ECI-1 Network Communications
Each ECI-1 instrument is a digital peripheral connected on an embedded local area network (LAN). Each LAN connection can be up to 200 feet in length.
Each instrument communicates with an external datalogger using the industry standard SDI-12 protocol.
Digital networks are highly resistant to data corruption from nearby EMI sources such as power lines, radios, and cell phones.
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10. Embedded Network of Instruments
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12. ECI-1 Laboratory Test Data
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13. Presentation Outline
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14. Laboratory Data: Hours of Chloride Ion Driving Per Day
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15. Laboratory Data: Chloride Voltage vs. Day
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16. Laboratory Data: Resistivity vs. Day
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17. Laboratory Data: LPR vs. OCP Comparison
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18. ECI-1 Field Data
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19. Bridge Installation, B623 Lynchburg, VA
Installed March 28th, 2002.
Concrete Poured April 22nd, 2002.
Data collected May 26th, 2002 through present.
4 ECI-1 units installed.
Campbell Scientific CR510 Datalogger.
Power Supply: 12 V battery and 10 Watt Solar Panel to Maintain Charge.
Telecommunications via Cellular Phone and Modem and Yagi antenna.
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20. ECI Installation in Lynchburg, VA
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21. Solar Panel and Cellular Antenna
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22. Solar Panel and Cellular Antenna
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23. Datalogger Mounted Under Bridge
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24. Electronics vs. Temperature LPR Measurement with Resistor Dummy Cells
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25. Electronics vs. Temperature Resistivity Measurement with Resistor Dummy Cells
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26. Field Data: Temperature vs. Day
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27. Field Data: Resistivity vs. Temperature
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28. Field Data: Resistivity vs. Day
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29. Field Data: Chloride Voltage vs. Temperature
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30. Field Data: Chloride Voltage vs. Day
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31. Field Data: Temperature Corrected Chloride Voltage vs. Day
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32. Field Data: Open Circuit Potential (OCP) vs. Temperature
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33. Field Data: OCP vs. Day
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34. Field Data: Linear Polarization Resistance (LPR) vs. Temperature
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35. Field Data: LPR and OCP vs. Days After Concrete Pour
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36. ECI-1 Product Milestones
Lab testing of prototype completed in 2001.
Field testing of commercial prototype began in 2nd quarter of 2002 (Rt. 460 bypass bridge, Lynchburg, VA)
U.S. Patent #6,690,182 issued. Chinese Patent issued.
International distributors established in Hong Kong, Northern China, and Singapore.
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