Transcript SONIC/ULTRASONIC NONDESTRUCTIVE TESTING

NONDESTRUCTIVE CONDITION
ASSESSMENT OF CONCRETE
RAILROAD TIES
Paul Fisk, NDT Corporation
CORPORATION
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Nondestructive Concrete Testing Services
18 Years-600+ projects
Developed Sonic/ultrasonic NDT Equipment
BACKGROUND
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Union Pacific Railroad Call
Test Out of Service Ties
Test Siding Ties
Test Plymouth Commuter Rail
Comparison of Impact Velocity
Results with AMTRAK Rating
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Impact Velocity and Echo Measurements
Impact Velocity Measurements
Compressional, Shear and Surface Wave Velocity
Moduli Values
Average Dynamic Strength
Crack Density
Impact Echo Measurements
Thickness
Delaminations
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Impact Velocity
Impact Echo
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Properties Detected by
SONIC/ULTRASONIC Testing
 Velocity
Concrete Condition (strength,
cracking)
 Thickness Resonant
Frequencies
 Thickness
 Delamination
 Signal Attenuation
 Delamination
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Sample Test Data
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CONCLUSION
 Sonic/ultrasonic results can be used to evaluate and
document the current condition of concrete railroad
ties
 Ties can be classified as
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Functional
Marginally Functional-should be retested in the near future
Non-Functional- take out of service
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Automated Testing
Estimated 1 tie per sec
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SUMMARY
 Sonic/ultrasonic pulse velocity data can be used to
evaluate and document the current condition of
concrete railroad cross ties
 Ties classification correlates with systems currently
used by rail roads
 Automated Sonic/ultrasonic data acquisition is fast
(1 sec/tie)
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QUESTIONS ????
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