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A New Real-Time, Non-Contact Transfer-Length Measurement Technique

A New Real-Time, Non-Contact Transfer-Length Measurement Technique. Inventors:. Dr. Terry Beck (Mechanical Engineering) Dr. Robert Peterman (Civil Engineering) Dr. John Wu (Industrial Engineering) Weixin Zhao (Industrial Engineering). What is the problem for which you have a solution ?.

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A New Real-Time, Non-Contact Transfer-Length Measurement Technique

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  1. A New Real-Time, Non-Contact Transfer-Length Measurement Technique Inventors: Dr. Terry Beck (Mechanical Engineering) Dr. Robert Peterman (Civil Engineering) Dr. John Wu (Industrial Engineering) Weixin Zhao (Industrial Engineering)

  2. What is the problem for which you have a solution ?

  3. Why Measure Transfer Length? • Used for calculation of shear capacity • Used for calculation of stresses • Has been shown to often be a good indicator of strand development length • Could be used as a tool to screen out potentially poor-bonding mixes

  4. How is the problem being solved now?What’s wrong with current solutions? We simply don’t measure it?

  5. Why Don’t We Measure Transfer Length at the Present Time? • There is currently not a convenient or time-efficient method to get this information • The current method(s) interrupt the daily casting and de-tensioning sequence

  6. Current Tool Whittemore Gauge

  7. Strain in Pretensioned Concrete Member

  8. What is our solution? Non-Contact Measurements Portable as Current Tool Much Higher Precision More Flexible

  9. Concept of Laser Speckle

  10. Photograph of Laser Speckle on Concrete

  11. Peak Distances vs. Strains Measures 0.02mm deflection 0.10mm deflection 0.20mm deflection

  12. Actual experimental workwe have performed?

  13. Concrete beam cutting experiment Prototype Design Beam Cutting Experiment Setup

  14. Cutting Pretensioned Specimen

  15. Comparison of Different Strain Gauges

  16. Prototype Specification 41/4 inches 8 in Optical Sensor Resolution: < 10me  1mm Weight: 3 lbs Dimension: 11”x6”x4” Measurement speed: 15 samples/second

  17. Concrete Cylinder Compression Experiment Optical Strain Gage Electronic Strain Gage

  18. Concrete Cylinder Results

  19. Concrete Cylinder Results

  20. What is the closest prior art that might be cited against the novelty of your invention? None !

  21. What Still Needs to Be Done? • Continue to Gather SCC Mix Ingredients • Cast Pretensioned Transfer-Length Specimens Members from 5 mixes used in SCC bond study • Compare Whittemore Gage Results with Optical Results

  22. Additional K-State PersonnelHave Been Added • Commercialization Manager. • 2 MBA Students (Final Project). • Product Design Engineer. • 2 Other Design Engineers (Optics and Electrical). • Precision Optical Measurements, Inc.

  23. The Goal • Version 1 available for use this summer. • For sale within one year (Approx. $20k)

  24. The Future

  25. Auto Measuring System Measurement Surface Sensor Traverse

  26. Delta Strain Rosette

  27. Who specifically would be a possible commercial partner or licensee for your invention? Precision Optical Measurement Inc. Advanced Manufacturing Institute

  28. Questions?

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