Pavement Maintenance Best PracticesPavement Maintenance Best Practices Thomas J. Wood Agenda • Why...
Transcript of Pavement Maintenance Best PracticesPavement Maintenance Best Practices Thomas J. Wood Agenda • Why...
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Pavement Maintenance Best Practices
Thomas J. Wood
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Agenda
• Why pavement maintenance / preservation is important
• Dealing with cracks • When to apply a surface treatment • Fog Sealing • Micro Milling • UTBWC • Thin Lays
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Why Pavement Preservation is Important
• Condition of pavements are declining • Costs are rising • Revenues are flat • Natural resources are being depleted
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Why Pavement Preservation is Important
• Traffic volume are increasing • More trucks
– Heavier trucks
• Roadway need to be updated to carry higher traffic levels
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Dealing With Cracks
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Dealing With Cracks
• Starts with using proper PG grade binder • MnDOT uses -34 new construction • See delay in cracking over -28 • MnDOT is studying Fracture Energy to see if
the test can determine resistance to cracking of mixture
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Dealing With Cracks Using a Texas Under Seal
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Texas Under Seal (TUS)
• Chip Seal applied before HMA Overlay – Milled surface – Non milled surface
• ⅜” minus chip • CRS-2p • Light on cover aggregate • Can pave as soon as rolling & sweeping is
completed
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TUS Performance Data
Control Section Performance
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TUS
• Why does it perform – Acts as stress relief membrane? – Super Tack?
• Have had other tack methods with higher peak strengths
– Limits water infiltration from base?
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TUS
• As of end of 2015 construction year 10+ projects have been built
• Seeing 30 to 40% reduction in reflective cracks after one year
• Not sure how long effect will last but appears to be cost effective
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Why you need to crack seal!
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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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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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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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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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Don’t forget edge joints
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When to Apply Surface Treatment (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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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
25-mm
Bottom Top
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Disk-Shaped Compact Tension Test: DC(T)
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DC(T) Results: TH-56
Higher fracture energy is better
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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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MnDOT’s Pavement Management Ride Data
Crack Leveling Done
5 to 6 years
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Control Section Never Chip Sealed
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Last Section Chip Sealed 2004
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Value of Fog Sealing
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Why Fog Sealing Shoulders (Picture taken in 2009)
Fog Seal applied 2001
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Fog Sealing still working after 4 years
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Micro Milling with PP Treatments
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Micro Milling with Pavement Preservation Treatments
• Why? – PM treatment normal have limited ride
improvement
• What are the performance targets – Equal to 2 inch mill & over lay – Quicker than overlay – Less costly overlay
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Micro Milling with Pavement Preservation Treatments
• Cost comparison – Chip seal 40% of the cost of 2 inch M & L – Micro Surfacing 60% cost of 2 inch M & L – UTBWC 90% cost of 2 inch M & L
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Micro Milling
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Micro Milling with Chip Seal
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Results for Chip Seal
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Micro Milling with Micro Surfacing
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TH 64 Pre Condition
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Current Condition
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MM with UTBWC
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UTBWC Performance As Wearing Course
• I-35 – MP 18 to 12
• Paved 2001 • Old concrete pavement
– Jointed 27’ panels
• Plan to overlay with 4.5 inches level 5 Super Pave
• Center 2 miles received ¾ inch of UTBWC also
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UTBWC Performance
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UTBWC
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Control Section
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Thin Lays HMA
• 4.75 mm mixture • Placed ¾ inch or less • MnDOT has limited experiences • Will be building 5 test sections next summer
as part of NCAT Partnership
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• Will use different binders PG 58-28, PG 58-34, and high polymer loading
• 50% RAP • 5% RAS • Will use spray paver to apply all sections • Will evaluate same as all other PP treatments
in study
Thin Lays HMA
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Goals of PP
• To maximize value of pavement • To extend useful life of pavement • To allow saving to be used to do right fix on
pavement at end of their life • To pay for expansion of system as needed • To save the environment
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Thank You!