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NONDESTRUCTIVE CONDITION ASSESSMENT OF CONCRETE RAILROAD TIES Paul Fisk, NDT Corporation.

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Presentation on theme: "NONDESTRUCTIVE CONDITION ASSESSMENT OF CONCRETE RAILROAD TIES Paul Fisk, NDT Corporation."— Presentation transcript:

1 NONDESTRUCTIVE CONDITION ASSESSMENT OF CONCRETE RAILROAD TIES Paul Fisk, NDT Corporation

2 CORPORATION Nondestructive Concrete Testing Services 18 Years-600+ projects Developed Sonic/ultrasonic NDT Equipment

3 BACKGROUND 1.Union Pacific Railroad Call 2.Test Out of Service Ties 3.Test Siding Ties 4.Test Plymouth Commuter Rail 5.Comparison of Impact Velocity Results with AMTRAK Rating

4 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

5 Impact Velocity Impact Echo

6 Properties Detected by SONIC/ULTRASONIC Testing Velocity  Concrete Condition (strength, cracking) Thickness Resonant Frequencies  Thickness  Delamination Signal Attenuation  Delamination Sample Test Data

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13 CONCLUSION Sonic/ultrasonic results can be used to evaluate and document the current condition of concrete railroad ties Ties can be classified as  Functional  Marginally Functional-should be retested in the near future  Non-Functional- take out of service

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23 Automated Testing Estimated 1 tie per sec

24 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)

25 QUESTIONS ????


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