Transcript Executive Summary

Embedded Corrosion Instrument
Presented By: ElectraWatch, Inc.
Presented To: Vanasse Hangen Brustlin, Inc.
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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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The ECI-1 Development Team
• Dr. Robert G. Kelly – Professor of Materials
Science and Engineering, University of Virginia
([email protected])
• Mr. Robert A. Ross – Electrical Engineering and
President, Virginia Technologies, Inc.
([email protected])
• Mr. J. Kurt Hudson – Electrical Engineering and
Laboratory Engineer, Virginia Technologies, Inc.
([email protected])
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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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ECI-1 Corrosion Measurement
Parameters
• ECI-1 Measurement Types:
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–
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Polarization Resistance
Resistivity
Open Circuit Potential
Chloride Level
Temperature
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ECI-1 Cutaway View
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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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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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Embedded Network of Instruments
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ECI-1 Laboratory Test Data
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Presentation Outline
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Laboratory Data: Hours of Chloride
Ion Driving Per Day
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Laboratory Data: Chloride
Voltage vs. Day
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Laboratory Data:
Resistivity vs. Day
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Laboratory Data:
LPR vs. OCP Comparison
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ECI-1 Field Data
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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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ECI Installation in Lynchburg, VA
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Solar Panel and Cellular Antenna
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Solar Panel and Cellular Antenna
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Datalogger Mounted Under Bridge
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Electronics vs. Temperature LPR Measurement
with Resistor Dummy Cells
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Electronics vs. Temperature Resistivity
Measurement with Resistor Dummy Cells
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Field Data: Temperature vs. Day
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Field Data: Resistivity vs. Temperature
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Field Data: Resistivity vs. Day
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Field Data: Chloride
Voltage vs. Temperature
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Field Data: Chloride Voltage vs. Day
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Field Data: Temperature Corrected
Chloride Voltage vs. Day
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Field Data: Open Circuit Potential (OCP)
vs. Temperature
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Field Data: OCP vs. Day
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Field Data: Linear Polarization
Resistance (LPR) vs. Temperature
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Field Data: LPR and OCP
vs. Days After Concrete Pour
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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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