37th Annual Rocky Mountain Asphalt Paving Conference February 25, 2010 Greg Milburn

Transcription

1 WAR ON CRACKS New Generation Paving Fabrics 37th Annual Rocky Mountain Asphalt Paving Conference February 25, 2010 Greg Milburn

2 Overview What causes cracks Why treat cracks Which cracks to treat Preventative crack reflection techniques Crack sealing/crack surfacing Paving Fabric SAMI (Stress absorbing membrane interlayer) Sawed relief joints

3 at causes cracks Overview y treat cracks ich cracks to treat ventative crack reflection techniqu rack sealing/crack surfacing aving Fabric AMI (Stress absorbing membrane nterlayer) awed relief joints

4 What Causes Cracks Thermal expansion/contraction (working) Change in HMA volume due to temperature changes Fatigue (non-working) Longitudinal wheel path Alligator Age hardening/oxidation of binder

5 Why Treat Cracks? Cracks are inevitable and neglect leads to accelerated cracking and potholing, further reducing pavement serviceability. (FHWA-RD )

6 Prevent water/incompressible intrusion Extends pavement life Can delay more expensive rehabilitations Protects base/subbase layers Original cracked AC

7 Prevent water/incompressible intrusion Extends pavement life Can delay more expensive rehabilitations Protects base/subbase layers New AC overlay Original cracked AC

8 Prevent water/incompressible intrusion Extends pavement life Can delay more expensive rehabilitations Protects base/subbase layers New AC overlay Original cracked AC

9 Prevent water/incompressible intrusion Extends pavement life Can delay more expensive rehabilitations Protects base/subbase layers New AC overlay Original cracked AC

10 Prevent water/incompressible intrusion Extends pavement life Can delay more expensive rehabilitations Protects base/subbase layers New AC overlay Original cracked AC

11 Prevent water/incompressible intrusion Extends pavement life Can delay more expensive rehabilitations Protects base/subbase layers New AC overlay Original cracked AC

12 Prevent water/incompressible intrusion Extends pavement life Can delay more expensive rehabilitations Protects base/subbase layers New AC overlay Original cracked AC

13 Glass Fiber Reinforced Paving Fabric Fiberglass grid bonded to a non-woven paving fabric For use in repair of both flexible & rigid pavements Provides moisture barrier High strength at very low strains Asphalt binder applied: gal/sy

14 Glass Fiber Reinforced Paving Fabric If application on milled surface 1/4 inch difference between adjacent ridges & valleys Difficult to install around tight radii May be problematic if milled Approximate tensile strength: 500 lbs/in ultimate & 300 2% strain Approximately 5 $/sy (installed)

15 Glass Fiber Reinforced Paving Fabric

16 Glass Fiber Reinforced Paving Fabric

17 Glass Fiber Reinforced Paving Fabric

18 Glass Fiber Reinforced Paving Fabric

19 Glass Fiber Reinforced Paving Fabric

20 Glass Fiber Reinforced Paving Fabric

21 Glass Fiber Reinforced Paving Fabric

22 Glass Fiber Reinforced Paving Fabric

23 Glass Fiber Reinforced Paving Fabric

24 Glass Fiber Reinforced Paving Fabric

25 Glass Fiber Reinforced Paving Fabric

26 Glass Fiber Reinforced Paving Fabric

27 Glass Fiber Reinforced Paving Fabric

28 Glass Fiber Reinforced Paving Fabric

29 Glass Fiber Reinforced Paving Fabric

30 Asphalt Reinforcement Grid Fiberglass grid For use in repair of both flexible & rigid pavements Not for use on milled surfaces High strength at very low strains Drainable Pressure sensitive adhesive or lightweight scrim

31 Asphalt Reinforcement Grid

32 Asphalt Reinforcement Grid

33 Asphalt Reinforcement Grid

34 Asphalt Reinforcement Grid

35 Asphalt Reinforcement Grid

36 Asphalt Reinforcement Grid

37 Asphalt Reinforcement Grid

38 Asphalt Reinforcement Grid

39 Asphalt Reinforcement Grid

40 Asphalt Reinforcement Grid

41 Asphalt Reinforcement Grid

42 Asphalt Reinforcement Grid

43 Asphalt Reinforcement Grid

44 Asphalt Reinforcement Grid

45 Polyester/Fiberglass Paving Mat Non-woven matrix of Fiberglass & polyester fibers For use in repair of both flexible & rigid pavements Provides moisture barrier Non-shrink, non-stretch, high melt temperature

46 Polyester/Fiberglass Paving Mat Asphalt binder applied: gal/sy If application on milled surface 1/8 inch difference between adjacent ridges & valleys Millable & recyclable Approximate tensile strength: minimum 100 psi Approximately 2 $/sy (installed)

47 Polyester/Fiberglass Paving Mat

48 Polyester/Fiberglass Paving Mat

49 Polyester/Fiberglass Paving Mat

50 Polyester/Fiberglass Paving Mat

51 Polyester/Fiberglass Paving Mat

52 Polyester/Fiberglass Paving Mat

53 Polyester/Fiberglass Paving Mat

54 Paving Fabric Challenges Choosing the right fabric for the job Use manufacturer s application charts Type of cracks? Waterproofing?

55 Paving Fabric Challenges Choosing the right fabric for the job Use manufacturer s application charts Type of cracks? Waterproofing?

56 Paving Fabric Challenges Choosing the right fabric for the job Use manufacturer s application charts Type of cracks? Waterproofing?

57 Paving fabric challenges Proper Installation Ensure Manufacturer's representative is present during installation

58 Paving fabric challenges Proper Installation Ensure Manufacturer's representative is present during installation

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63 Paving Fabric Challenges Specification Development Permissive or prohibitive Developing performance based specifications

64 Sawed Relief Joints

65 Sawed Relief Joints Used on full-depth asphalt pavements Increases frequency of thermal cracks Minimizes joint movement from pavement temperature cycling Cracks/joints are more easily maintained Ensures smooth ride

66 QUESTIONS