1. Surface Preparation before laying Hot Mix
TACERA 2017

2. What to look for before laying Hot Mix

3. Needs

4. Asphalt - Water Ponding

5. THREE RULES ABOUT WATER on ASPHALT
SHED THE WATER

6. Remove water
Drains

7. Surface Preparation Profiling for smoothness Improvement in ride

8. GPR
Ground Penetrating Radar (GPR): Determine existing pavement thickness, including HMA and base course thickness

9. GPR
Use of Ground Penetrating Radar (GPR) The development of voids beneath roadways is a serious hazard, making their early detection an important aspect of infrastructure maintenance. Early identification of concealed subsurface voids under a roadway structure is critical to prevent major failures from occurring. One of the most effective tools in use is ground penetrating radar (GPR). GPR has advanced to a level where the subsurface condition of a roadway can be diagnosed with confidence. GPR is a non-destructive geophysical device used for subsurface exploration and operates by transmitting an electromagnetic pulse from an antenna into the ground and then capturing the partial reflections from subsurface layers.

10. GPR

11. GPR

12. Falling Weight Deflectometer
A falling weight deflectometer (FWD) is a testing device used by civil engineers to evaluate the physical properties of pavement. 

13. FWD
FWD data is most often used to calculate stiffness-related parameters of a pavement structure.
The FWD is designed to impart a load pulse to the pavement surface which simulates the load produced by a rolling vehicle wheel.
A load cell mounted on top of the load plate measures the load imparted to the pavement surface.

14. Falling Weight Deflectometer

15. SAFE!!!

16. Signing/Warnings Safety

17. Surface Preparation: Subgrade

18. Surface Preparation: Subgrade

19. Surface Preparation Clean the surface (sweeping)
Remove Vegetation from shoulders (blading)
Remove raised pavement markers
Patch defective areas:
Asphalt
Concrete
Seal the cracks
Mill the pavement

20. Sweeping/Blade Edges

21. Surface Preparation Sweeping

22. Remove Pavement markings

23. Pavement Markings: Remove

24. Patch Defective areas Asphalt

25. REPAIRS:

26. Repairing concrete

27. Full depth concrete repair

28. Clean and Seal Cracks

29. Clean and Seal

30. SEALING CRACKS

31. SEALING

32. Crack Sealing Too Much?

33. Crack Seal

34. Crack Seal: Hot Asphalt

35. Surface Preparation Milling:
Removes older pavements
Helps to re-establish road profile
Provides RAP for recycling operations
Allows curb and gutter grade lines to remain
Provides a technique to maintain clearances for overhead structures

37. Nice Milling

38. Milling the Surface

39. TACK COAT

40. Tack Coat
Clean the surface before placing the tack coat. Unless otherwise approved, apply tack coat uniformly at the rate. The rate should be between 0.04 and 0.10 gal. of residual asphalt per yard of surface area.

41. Tack Coat
Apply the tack coat in a uniform manner to avoid streaks and other irregular patterns. Apply a thin, uniform tack coat to all contact surfaces of curbs, structures, and all joints. Allow adequate time for emulsion to break completely prior to placing any material.

42. Tack Coat
Prevent splattering of tack coat when placed adjacent to curb, gutter, and structures.
Roll the tack coat with a pneumatic-tire roller to remove streaks and other irregular patterns when directed.

43. Is this a good application?

44. Is this a good application?

45. Is this a good application?

46. Good or Bad ?

47. Good or Bad ?

48. Thin overlay/Level ups

49. THIN OVERLAY: Level Up

50. THIN OVERLAY: PFC

51. READY

52. Surface Preparation before laying Hot Mix
THANK YOU