Chapter 5 Diamond Grinding and Grooving

1. Chapter 5Diamond Grinding and Grooving From… Maintenance Technical Advisory Guide (MTAG)

2. Learning Objectives • List benefits of diamond grinding and grooving • Describe recommended diamond grinding/grooving dimensions • Describe recommended construction procedures • List important quality control activities • Describe potential construction and performance problems • Identify troubleshooting solutions

3. Presentation Outline • Introduction • Design considerations • Construction • Quality control • Troubleshooting

4. Grinding Diamond Grinding

5. Grinding Diamond GrindingBenefits • Restored smoothness • Improved friction • Improved cross slope • Reduction in noise

6. Grinding Diamond GrindingEffect on Roughness Percent decrease in IRI NA = Not applicable

7. Grinding Diamond GrindingEffect on Friction Percent increase in friction NA = Not applicable

8. Grinding Diamond GrindingProject Selection • Consider effectiveness and limitations • IGGA and ACPA recommendations • Present serviceability index (PSI) range of 3.8 to 4.0 • Before critical faulting level • Used with other CPR activities

9. Grinding Diamond GrindingProject Selection

10. Grinding Diamond GrindingProject Selection

11. Grinding Diamond GrindingLimitations • Does not address structural or durability problems • Hardness of aggregate affects costs • Roughness will return if causes are not addressed

12. Grinding Diamond GrindingFollowing Load Transfer Restoration

13. Grooving Diamond Grooving

14. Grooving Diamond Grooving • Cutting parallel grooves into the pavement using diamond saw blades • Longitudinal vs. transverse • Benefits • Improved wet weather friction • Reduction in splash and spray

15. Grooving Diamond GroovingProject Selection • Historical crash rate, friction number, or macrotexture depth data • Potential locations for wet weather crashes • Pavements should be structurally and functionally sound

16. Grooving Diamond GroovingLongitudinal Grooving • Advantages • Restored surface friction • Decreased hydroplaning potential • Improved curve tracking • Easier to conduct under traffic • Disadvantages • Perception poor handling for motorcycles and light cars

17. Grooving Transverse Diamond Grooving

18. Grooving Diamond GroovingTransverse Grooving • Advantages • Most direct channel for water drainage • Introduces a surface that provides significant braking traction • Disadvantages • Maintaining adjacent traffic • Excessive noise • Productivity

19. Grooving Diamond GroovingEffect on Friction

20. Module 5-1 Design, Materials & Specifications From… Maintenance Technical Advisory Guide (MTAG)

21. Presentation Outline  • Introduction • Design considerations • Construction • Quality control • Troubleshooting

22. Grinding Diamond GrindingDesign Considerations • Degree of faulting • Review past corrective efforts • Design specifications • Concurrent restoration techniques • Blade spacing • Transverse slope • Grinding limits and transitions

23. Grinding Diamond GrindingDimensions

24. Grooving Diamond GroovingDesign Considerations • Groove entire lane area • Allowances for small areas with surface irregularities • Use recommended blade spacing

25. Grooving Diamond GroovingDimensions

26. Typical Item Codes http://i80.dot.ca.gov/hq/esc/oe/awards/#item_code

27. Module 5-2 Construction and Inspection From… Maintenance Technical Advisory Guide (MTAG)

28. Presentation Outline  • Introduction • Design considerations • Construction • Quality control • Troubleshooting 

29. Grinding Diamond GrindingConstruction Considerations • Grinding sequence and pattern • Continuous operation • Begin and end perpendicular to centerline • Maximum overlap of 50 mm (2 in) • Disposal of slurry

30. Grinding Diamond GrindingCutting Head Specifications • Diamond blades mounted in series on cutting head • Cutting head width from 910 to 970 mm (36 to 38 in) • Spacing of 164 to 197 blades per meter (50 to 60 blades per ft)

31. Grinding Diamond GrindingCutting Head

32. Grinding Diamond GrindingConstruction Procedures • Mobile single lane closure • Conduct grinding parallel to centerline • Multiple passes per lane • Slurry removal

33. Grinding Diamond GrindingGrinding Machine

34. Grinding Diamond GrindingGrinding Machine

35. Grinding Diamond GrindingTrucks Collecting Slurry

36. Grinding Diamond GrindingGrinding Process

37. Grinding Diamond GrindingFront of Grinding Head

38. Grinding Diamond GrindingBehind the Grinding Head

39. Grinding Diamond GrindingAfter First Pass of Grinding Machine

40. Grinding Diamond GrindingFinished Product

41. Grinding Diamond GrindingDemonstration of Construction Process

42. Grooving Diamond GroovingConstruction Considerations • Groove dimensions • Direction of grooving • Disposal of slurry • Procedures similar to diamond grinding

43. Grooving Diamond GroovingEquipment • Head width: 0.3 to 3.7 m (1 to 12 ft) • Longitudinal blade spacing of 19 mm (3/4 in) • Vacuum system employed to collect slurry

44. Presentation Outline  • Introduction • Design considerations • Construction • Quality control • Troubleshooting  

45. Grinding Diamond GrindingQuality Control • Profile • Pavement roughness • Need acceptance standards • Skid resistance • Standard smooth tire • Improvement may be temporary if aggregate is susceptible to polishing

46. Grooving Diamond GroovingQuality Control • Quality assessed through friction • Values prior to grooving compared with post-grooving values • Direct measurement of surface texture can also be used

47. Project Checklist • Preliminary Responsibilities • Document Review • Project Review • Equipment Inspections • Diamond-Grinding Machine • Profilograph or Profiler • Others • Weather Requirements • Traffic Control

48. Project Checklist • Project Inspection Responsibilities • Alignment • Texture • Residues

49. Presentation Outline  • Introduction • Design considerations • Construction • Quality control • Troubleshooting   

50. Identify Problem Determine Cause Identify Solution Troubleshooting • Construction quality and performance problems • Approach: