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

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

7. Current Tool Whittemore Gauge

8. Strain in Pretensioned Concrete Member

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

11. Concept of Laser Speckle

12. Photograph of Laser Speckle on Concrete

15. Peak Distances vs. Strains Measures 0.02mm deflection0.10mm deflection0.20mm deflection

16. Actual experimental work we have performed?

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

20. Cutting Pretensioned Specimen

21. Comparison of Different Strain Gauges

23. Prototype Specification 4  1/4 inches 8 in Resolution: < 10  m Weight: 3 lbs Dimension: 11”x6”x4” Measurement speed: 15 samples/second Optical Sensor

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

26. Concrete Cylinder Results

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

29. 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

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

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

32. The Future

33. Measurement Surface Traverse Sensor Auto Measuring System

34. Delta Strain Rosette

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

36. Questions?