in-place recycling & reclaiming seminar | fargo, nd | june ...€¦ · in-place recycling &...
TRANSCRIPT
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Pavement Preservation: Make the Most of Your New
Road
Thomas J. Wood
612/419/4013
WSB & Associates Inc.
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Topics
• Crack Sealing
• Chip Sealing
• Fog Sealing
• Micro Surfacing
• Other stuff
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Why you need to crack seal!
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Why Crack Treatment?• Prevents water intrusion into subbase
• Prevents incompressible intrusion
• Improves ride quality smoothness
• Slows down pavement deterioration
• COST-EFFECTIVE
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Why You Should Treat Cracks
• Protect your largest investment• Pavement failure imminent• Crack treatments are cost-effective, up to 9 years of (75%
effectiveness) performance• Extends pavement life
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
What cracks to treat?• All cracks soon after they appear… any crack opening will allow
moisture penetration into pavement foundation (subbase) • At minimum all cracks ≥1/8”
• Rout and Seal
• Clean and Fill
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
How to Seal Cracks• Rout & Seal use on newer pavements with transverse crack
spacing greater than 20’
• Clean & Seal older pavements and longitudinal cracks
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Don’t forget edge joints
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Use the Proper PG Binder
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Chip Sealing
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Chip Sealing• It is a heavy asphalt membrane followed with layer of aggregate
chips
• Strengths• Very tough
• Fast
• Improves friction characteristics
• Long lasting
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Chip Sealing• Weakness
• Vehicle damage
• Damage from turning traffic
• Too rough
• Does not fix structural issues
• Does not improve ride
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Chip Sealing• How to do it right
• Design it
• Use quality Materials• Clean Aggregate
• No extra Aggregate
• Polymer modified emulsion
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Chip Sealing• Construction Practices
• Place Aggregate immediately
• Rolling
• < 2 minutes
• Minimum 3 passes
• Minimum 3 rollers
• Sweep ASAP
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
When to Apply Chip Seal• Built aging study
• Because 15 years take 15 years
• 3 inch Mill & Fill 1999• PG 58-28 binder
• Chip seal 1 mile section each year starting in 2000
• Last sections was chip seal 2004
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
TH56 Cores
• Cores• Remove chip seal (if any)
• Cut into two 25-mm layers
• Test for fracture energy (cracking potential)
• Recover component asphalt to check aging
Bottom
Top
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Disk-Shaped Compact Tension Test: DC(T)
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
DC(T) Results: TH-56
Higher fracture energy is better
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Asphalt Institute’s Findings• Sealing improves resistance to aging (cracking)
• Sooner is better when sealing• Waiting for 3 or more years to seal after construction produced similar
results as unsealed pavement related to DCT
• Sealing after 1 or 2 years showed improvement in resistance to aging (cracking)
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Surface Rating
Crack repair done
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
International Roughness IndexRide
R² = 0.8722
R² = 0.9783
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
2000 2005 2010 2015 2020
TH56 Average IRI
control
Chip Sealed
Poly. (control)
Poly. (Chip Sealed)
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Control Section Never Chip Sealed
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Last Section Chip Sealed 2004
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Fog Sealing
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Fog Sealing• Light uniform application asphalt emulsion
• Materials• Css-1h diluted
• Diluted one part water to one part emulsion
• 29% residual asphalt
• Better penetration
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Fog Sealing• Strengths
• Easy
• Minimum equipment
• Great job water proofing surface
• Fill pop outs and micro cracks
• Protects HMA from• UV, oxidation, & de-ice chemicals
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Value of Fog Sealing
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Why Fog Sealing Shoulders(Picture taken in 2009)
Fog Seal applied 2001
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Fog Sealing still working after 4 years
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Micro Surfacing
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
What is Micro/Slurry
• Homogenous mixture of aggregate and asphalt emulsion• Like a Dairy Queen Blizzard
• Slurry cure by air drying• Top down
• Micro Surfacing chemical cure• Will cure and set at night
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
What is Micro/Slurry
• Used for Surface treatments
• Rut filling
• Ride improvement
• Improve Friction
• Used both on concrete and HMA
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Project Selection
• Structurally sound
• Small potholes ok
• Raveling ok
• Flushing ok
• Aged and oxidized ok
• Slurry should only be used for surface treatment• One layer thick
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Project Selection
• Micro
• Surface treatment
• Developed by Germans in the late 70’ies
• Rut filling• Up to 1 ½ inches in one pass
• Restore Cross Section
• More durable then slurry
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Good Candidate
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Rut Filling
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Possible Candidate for Micro
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
NOT a Good Candidate for Micro
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Micro Milling with PM Treatments
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Micro Milling with Chip Seal or Micro Surfacing
• Why?• Need lower cost alternative to 1 ½ inch over lay
• To improve ride
• What are the performance targets• Equal to 1½ inch over lay
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Micro Milling with Chip Seal or Micro Surfacing
• Quicker than overlay
• Less costly overlay• Chip seal 40% of the cost of 1½ inch over lay
• Micro Surfacing 60% cost of 1 ½ inch over lay
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Micro Milling
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Micro Milling with Chip Seal
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Results for Chip Seal
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Micro Milling with Micro Surfacing
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
TH 64 Pre Condition
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Current Condition
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Micro Surfacing Research
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
• Issues• Reflective cracking
• Snow plow chatter
• Wear off in 5 to 7 years on high ADT roadways
Micro Surfacing Research
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Hypothesis
• Softer asphalt should reduce cracking
• CQS-1h 40 to 90 pen or PG 64-22 normally used
• Used softer base Asphalts• 90 to 200 pen (PG 58-28) CQS-1
• 200 to 300 pen (PG 49-34) CQS-1S
Micro Surfacing Research
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Hypothesis
• More asphalt = increased durability
• Increased emulsion from national ave. 12% to as high as16%
• No bleeding or shoving
Micro Surfacing Research
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
• Asphalt to Fines ratio • .74 A to 1.0 F Normal
• .87 A to 1.0 F 14% emulsion
• .99 A to 1.0 F 16% emulsion
• HMA normally has asphalt to fines ratio of 1 to 1
• Looks more like HMA than Micro
Micro Surfacing Research
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
SFDR
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
IRI M/KM
1 M/KM =69 in/mi
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Transverse Cracking
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Rutting
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
3.5 million BESAL Design
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Emulsion Stabilized FDR
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Modified Double Chip Surface
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
7 0 to90 laps per day at 80K
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
• Two localized areas of failure easily patched
• 50,000+ ESAL
• Comment from Staff “seem to improve with time and traffic”
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
My New Role
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
ISSA Executive Technical Director
• Out reach
• Update Technical Information
• Training
• Support
• Promote Preventive Maintenance
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
QuestionsLight Limited Super
Stock
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In-Place Recycling & Reclaiming Seminar | Fargo, ND | June 27-28, 2017
Thank youTom Wood
Pavement Specialist / Executive Technical Director
WSB & Associates'
612/419/4013