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Chapter 4 Joint Resealing and Crack Sealing

Chapter 4 Joint Resealing and Crack Sealing. From… Maintenance Technical Advisory Guide (MTAG). Learning Objectives. List the benefits of joint resealing and crack sealing List the desirable sealant properties and characteristics Describe recommended installation procedures

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Chapter 4 Joint Resealing and Crack Sealing

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  1. Chapter 4Joint Resealing and Crack Sealing From… Maintenance Technical Advisory Guide (MTAG)

  2. Learning Objectives • List the benefits of joint resealing and crack sealing • List the desirable sealant properties and characteristics • Describe recommended installation procedures • List important quality control activities • Describe potential construction and performance problems • Identify troubleshooting solutions

  3. Presentation Outline • Introduction • Material selection and reservoir design • Construction • Quality control • Troubleshooting

  4. Introduction • Definition Placement of an approved sealant material in an existing joint or crack to reduce moisture infiltration and prevent intrusion of incompressibles

  5. Subgrade Softening PCC Pavement DeteriorationInfluence of Moisture Infiltration Cracks/Joints + Moisture Infiltration Loss of Fines (Pumping) Corner Breaks Transverse Joint Faulting

  6. Breakdown of Existing Cracks PCC Pavement DeteriorationInfluence of Moisture Infiltration Cracks + Moisture Infiltration Deteriorated Cracks

  7. PCC Pavement DeteriorationInfluence of Incompressibles Cracks/Joints + Incompressible Material Joint Spalling Blow-Ups

  8. PCC Joint ResealingCurrent Practice • Debate: to seal or not to seal • Some believe the benefits do not offset the costs • Most states seal transverse joints • Recommendation: continue to reseal joints if they were originally sealed!

  9. Guidelines for Resealing Joints • Sealant no longer functional • Pavement not severely deteriorated • Performed with other CPR activities • Moderate installation temperatures • Proper material selection and joint preparation is essential

  10. Guidelines for Sealing Cracks • Seal working transverse cracks • Can seal cracks £ 13 mm (0.5 in) wide • Use special crack-sawing blades • Same general joint resealing procedures apply to crack sealing

  11. Module 4-1 Design, Materials & Specifications From… Maintenance Technical Advisory Guide (MTAG)

  12. Material Selection • Sealant • Thermoplastic materials • Thermosetting materials • Backer rod

  13. Sealant MaterialThermoplastic Materials • Rubberized asphalt • Low modulus rubberized asphalt • PVC coal tar

  14. Sealant MaterialThermosetting Materials • Polysulfide • Polyurethane • Silicone (non-sag) • Silicone (self-leveling)

  15. Sealant MaterialDesirable Sealant Properties

  16. Sealant Material Performance • Varies greatly with material type • Quality of installation procedures • Design factors affecting performance: • Joint movement • Sealant properties • Shape factor

  17. Material Selection Factors • Climate conditions • Traffic level and percent trucks • Crack extent and severity • Contractor experience • Safety concerns • Material availability and cost

  18. Joint Reservoir DesignCommon Configurations

  19. Backer Rod Joint Reservoir Design 3.2 to 6.4 mm (0.125 to 0.25 in) recess Sealant Width Thickness (W) (T) Sealant

  20. Joint Reservoir DesignRecommended Shape Factors

  21. Sealant and Related Specs http://www.dot.ca.gov/hq/esc/oe/specifications/SSPs/2006-SSPs/

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

  23. Module 4-2 Construction and Inspection From… Maintenance Technical Advisory Guide (MTAG)

  24. Construction: Joint Resealing

  25. Construction: Joint ResealingProcedure • Sealant removal • Joint refacing • Joint cleaning • Backer rod installation • New sealant installation

  26. Construction: Joint ResealingSealant Removal with Joint Plow

  27. Construction: Joint ResealingJoint Refacing

  28. Construction: Joint ResealingRefacing Blades

  29. Construction: Joint ResealingSandblasting

  30. Construction: Joint ResealingCompressed Air

  31. Construction: Joint ResealingBacker Rod

  32. Construction: Joint ResealingBacker Rod Installation

  33. Construction: Joint ResealingInstalled Backer Rod

  34. Construction: Joint ResealingThermoplastic Sealant Installation

  35. Construction: Joint ResealingSilicone Sealant Installation

  36. Construction: Joint Resealing Longitudinal PCC/PCC Joints • Tied non-working joint • Hot-poured thermoplastic materials • Reservoir not always formed

  37. Construction: Joint Resealing Longitudinal PCC/PCC Joints

  38. Construction: Joint Resealing Longitudinal PCC/HMA Joints • 25-mm (1-in) width (min.) and depth • No backer rod required • Hot-pour and silicone sealants

  39. Construction: Joint Resealing Longitudinal PCC/HMA Joints

  40. Construction: Joint Resealing Longitudinal Sawcutting

  41. Construction: Joint Resealing Sawed Longitudinal Joint Reservoir

  42. Construction: Joint Resealing Installation of Sealant

  43. Construction: Joint Resealing Sealed PCC/HMA Longitudinal Joint

  44. Construction: Crack Sealing

  45. Construction: Crack Sealing Procedure • Crack sawing • Cleaning • Backer rod Installation • Sealant installation

  46. Construction: Crack Sealing Crack Sawing

  47. Construction: Crack SealingCompleted Crack Seal

  48. Presentation Outline  • Introduction • Material selection and reservoir design • Construction • Quality control • Troubleshooting   

  49. Quality Control • Sealant preparation • Surface preparation • Placement conditions • Method of application • Curing • Opening to traffic

  50. Quality ControlClass Exercise • Break into three groups • Pre-Seal considerations • Equipment considerations • Project inspection considerations • Rate QC items as Required, Desired, or Not Necessary • Use Reference Manual, checklist, and your experience

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