1. Roadware MICRODOWELING Technology Hybrid Urethane Concrete Repair

2. Roadware History Established 1991 in Minnesota Instrumental in Providing Performance Based High-speed Concrete Repair Products Corporately Over 50 Years Product Development and Field Application In: –Highway –Industrial –Commercial

3. What is MICRODOWELING?

4. Technical Data Summary Hardness @ 72F72D Compressive Strength (w/sand)4500psi Elongation:6% Tensil Strength4475psi Bond Strength, Cal-5511100psi Viscosity (at application)9 cps V.O.C. (Mixed):5.5 g/l Solids:98% Cured Color (not exposed to sunlight)Gray

5. Technical Data Summary Hardness @ 72F72D Compressive Strength (w/sand)4500psi Elongation:6% Tensil Strength4475psi Bond Strength, Cal-5511100psi Viscosity (at application)9 cps V.O.C. (Mixed):5.5 g/l Solids:98% Cured Color (not exposed to sunlight)Gray

6. Surface Tension A measurement of the ability of a liquid to overcome its own internal friction and penetrate into a material like concrete.

7. Surface Tension Roadware 10 Minute Concrete Mender has a surface tension three times less than water.

8. Surface Tension Fluid Surface Tension (N/m) Water at 20°C0.0729 Ethanol0.0223 Benzene0.0289 Glycerin0.0634 Mender Part A0.026 Mender Part B0.026 Mender 30-40 sec after mixing0.026

9. Viscosity of Concrete Mender (Time zero = time of ejection from nozzle)

10. Viscosity of Concrete Mender (Time zero = time of ejection from nozzle)

11. Why it Works Superior Bond Strength Ease of Application Shrinkage Modulus of Elasticity

12. Superior Bond Strength Mechanical Interlock with Microstructure of the Substrate –Measured with Scanning Electron Microscope Concrete Beam Fractured Realigned with 1/8 Gap Mender Applied Specimen Was Sawed to Isolate Small Samples

13. Superior Bond Strength

15. Why it Works Superior Bond Strength Ease of Application Shrinkage Modulus of Elasticity

16. Ease of Application Viscosity –Related to The Ease of Which Individual Molecules of the Liquid Can Move With Respect to Each Other –Measured As a Function of Time Brookfield Viscometer

17. Ease of Application (Time zero = time of ejection from nozzle)

18. Ease of Application Concrete Mender Easily Wetted the Surface of Concrete –Mender Is Drawn Into the Concrete Pore Structure by Capillary Tension –Significant Penetration Occurs Within Minutes of Contact.

19. Ease of Application LiquidViscosity at 25C (cP) Methanol0.55 Benzene0.65 Water1.0 Ethanol1.2 Concrete Mender9.0 Ethylene Glycol16 Glycerin1490

20. Why it Works Superior Bond Strength Ease of Application Shrinkage Modulus of Elasticity

21. Shrinkage International Concrete Repair Institute (ICRI) –Guideline No. 03733 Shrinkage of 0.05% Is Considered Low

22. Shrinkage 0.10% Between 1 Hour and 7 Days 0.05% Between 2 Hours and 7 Days Test Was Completed Without Sand Adding Sand Will Proportionately Reduce Overall Shrinkage

23. Shrinkage

24. Why it Works Superior Bond Strength Ease of Application Shrinkage Modulus of Elasticity

25. 3-point Beam Deflection Test –Tested to Fracture –Nearly Linear Load-Deflection Until Fracture –Samples Fractured in a Brittle Manner

26. Modulus of Elasticity Sample Modulus of Elasticity psi (Mpa) Modulus of Rupture psi (Mpa) Neat Concrete Mender137,000 (944)3450 (23.8) Concrete Mender w/ sand (54% vol% sand) 739,000 (5100)3990 (27.5)

27. Concrete Mender: Summary High Quality Bond Achieved Low Viscosity Low Surface Tension Shrinkage Is Low

28. Concrete Mender: Conclusion Repairing Cracks With Concrete Mender Largely Restores the Structural Performance of the Original Concrete

29. Roadware MICRODOWELING Technology Concrete Mender Job Pics

30. Repairs - Parking Decks Cracks in parking structures and bridge decks can be repaired without destructive cutting and grinding. Only a light scoring with a diamond blade grinder is used to clean out the crack. A wire wheel grinder will work too.

31. Repairs - Parking Decks Roadware 10 Minute Concrete Mender is flooded deep into the crack and self-injects into the concrete like water into a sponge.

32. Repairs - Parking Decks Roadware 10 Minute Concrete Mender is flooded deep into the crack and self-injects into the concrete like water into a sponge. Silica sand is added to the surface and excess material is wiped away with a trowel or even a piece of cardboard. The brushed finish is retained. The repair is fully traffic ready in 10 minutes.

33. Repairs - Parking Decks A core sample of the concrete reveals the level of free penetration of 10 Minute Concrete Mender when photographed under filtered UV light.

34. Job Pics

35. Crack Repair Movie

36. Job Pics Crack is IdentifiedScored and Cleaned out Mender and Sand is Added

37. Job Pics Crack Being Repaired at Full Depth, Sand Is Added to Stop Sinkers Additional Material Is Added to Fill the Crack Up Excess Material is Troweled and Scraped

38. Job Pics After 10 Min. The concrete is ready. A grinding stone is used to blend the repair Mender Blender can be added to cover the repaired slab Completed Repair

39. Roadware MICRODOWELING Technology Hybrid Urethane Concrete Repair