Ohio DOTs FineGraded Polymer Asphalt Concrete a'k'a' Smoothseal - PowerPoint PPT Presentation

Title: Ohio DOTs FineGraded Polymer Asphalt Concrete a'k'a' Smoothseal


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Ohio DOTs Fine-Graded Polymer Asphalt Concrete
(a.k.a. Smoothseal) and ODOTs Look at PM
Cost-Effectiveness
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• General
• Description of Candidate Projects
• Materials Characterization
• Description of Application
• Manufacturing and Placement
• Costs
• Skid Considerations
• Conclusion

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• General
• Developed in the early 1990s by Ohios asphalt
  paving industry.
• Non-proprietary Hot Mix Asphalt product capable
  of being placed in thin lifts
• Governed by ODOT, Item 424, Fine Graded Polymer
  Asphalt Concrete
• For use as a pavement preservation (PM) treatment
  or long-life pavement applications.
• Since 2002 approx. 324,000 CY placed

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• General

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• General
• Description of Candidate Projects

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• Description of Candidate Projects
• Pavements suitable for a surface treatment
  overlay show the following distresses
• Dry-looking, bony pavements that are porous or
  permeable
• Pavements that have begun to ravel
• Pavements with extensive cracking too fine for
  crack sealing
• Pavements with cracking of the surface too
  extensive for crack sealing alone
• Pavements where curb reveal does not permit heavy
  lift thicknesses

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• Description of Candidate Projects
• Candidate pavements will have...
• no unrepaired structural (fatigue) damage
• no appreciable rutting (lt ¼ inch)
• sufficient remaining structural capacity to last
  the life of the treatment
• Note Rapidly deteriorating pavements are not
  good candidates for PM. Rapid deterioration is
  indicative of inadequate pavement strength.

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• General
• Description of Candidate Projects
• Materials Characterization

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• Materials Characterization
• Types of Smoothseal
• Type A
• Mix Design - Recipe mix
• Type B
• Mix design - Designed by the Marshall Method for
  light, medium, or heavy traffic pavements

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• Materials Characterization
• Types of Smoothseal
• Type A
• Composition
• Blend of mason and concrete sands w/ 8.5 polymer
  modified asphalt binder
• Silicon dioxide requirement on the fine agg.
  ensures good skid resistance
• Highest polymer dosage used in todays market
  enhances mix toughness, stability, and longevity

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• Materials Characterization

90
80
70
60
50
40
30
20
10
0
200
30
8
4
3/8
1/2
3/4
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• Materials Characterization
• Types of Smoothseal
• Type B
• Composition
• ½-inch max. sized coarse agg. and sand particles
  w/ min. polymer binder content of 6.4
• 100 two-faced crushed coarse agg. for heavy
  traffic mixes to provide stability
• Silicon dioxide requirement on the fine agg.
  ensures good skid resistance
• Highest polymer dosage used in todays market
  enhances mix toughness, stability, and longevity
• 10 RAP permitted

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• Materials Characterization

90
80
70
60
50
40
30
20
10
0
200
30
8
4
3/8
1/2
3/4
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Types of Smoothseal
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• General
• Description of Candidate Projects
• Materials Characterization
• Description of Application

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• Description of Application
• Overlay thickness guidelines
• Type A mix
• 5/8 lt thickness lt 1 1/8
• Type B mix
• 3/4 lt thickness lt 1 1/2
• Note Pavement surfaces having significant
  irregularity will require a leveling course or
  milling prior to placement of Smoothseal.

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• General
• Description of Candidate Projects
• Materials Characterization
• Description of Application
• Manufacturing and Placement

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• Manufacturing and Placement
• Manufacturing Smoothseal will be similar to other
  polymer-modified HMA
• Greater heat during production
• Elevated mix temperature at the project site -
  max. 350ºF
• Sufficiently hot to compact
• Not so hot so as to cause binder draindown
• At least 290ºF at time of compaction

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• Manufacturing and Placement
• Placing Smoothseal
• Heightened attention to factors affecting
  pavement smoothness
• Uniformity in production, temperature, mix
  delivery, head of material before the screed, and
  compaction all become critically important
• Handling and raking should be minimizedvery,
  very sticky mix!
• Avoid feathering
• Butt joints preferred for joint construction

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• Manufacturing and Placement
• Ensuring a successful Smoothseal job
• Place material on clean and dry pavement
• Place material on pavement having a minimum 60ºF
  surface temperature
• Ensure uniform application of tack coat, set
  prior to paving
• DO NOT USE PNEUMATIC TIRE ROLLERS.
• Construct hot longitudinal joints or seal cold
  joints with bituminous material thoroughly
  coating the vertical face without runoff

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TECH. BULLETIN flexiblepavements.org
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• General
• Description of Candidate Projects
• Materials Characterization
• Description of Application
• Manufacturing and Placement
• Costs

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• Costs
• Cost comparison

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• General
• Description of Candidate Projects
• Materials Characterization
• Description of Application
• Manufacturing and Placement
• Costs
• Skid Considerations

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• Early Skid Findings (2006 data)

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• General
• Description of Candidate Projects
• Materials Characterization
• Description of Application
• Manufacturing and Placement
• Costs
• Skid Considerations
• Conclusion

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• Conclusion
• Smoothseal is
• a highly durable and skid resistant HMA surface
• ideally suited for thin PM applications
• suitable as a long lasting surface in
  rehabilitation or new construction pavement
  build-ups

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The Smoothseal texture
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Paving Englewood city streets with Smoothseal -
2002
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Paving Englewood city streets with Smoothseal -
2002
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Lucas County US23 / IR475 Smoothsealed
2002/03
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Smoothsealing US6 in Henry and Wood Counties -
2001/02
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Smoothsealing SR82 in Cuyahoga County - 2003
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North Coast Inland Bike Path 2005 Paved with
Smoothseal, Type A
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IR 70, Franklin Co. -2006 Smoothseal, Type B
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Ohio DOTs Look at PM Cost-Effectiveness
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Cost-Effective Preventive Maintenance
requires Selecting the right treatment at the
right time for the given pavement conditions.
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• 3-Year study launched to
• Determine conditions under which PM treatments
  are cost-effective
• Quantify PM treatment cost-effectiveness by
  evaluating their impact on
• Life Cycle Cost
• Benefit Cost
• How determine if a treatment is cost-effective?
  By comparing against a Do Nothing

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• Treatments being evaluated
• Chip Seal
• Single Microsurfacing
• Double Microsurfacing
• Novachip
• Smoothseal
• Thin asphalt overlays without repairs
• Thin asphalt overlays with repairs

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• Interim Findings of ODOT PM Study

Table 1 Summary of Cost-Effectiveness as
Measured by Life-Cycle Cost (/SY)
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• Interim Findings of ODOT PM Study

Table 3 Treatment Effectiveness on Pavements in
FAIR Condition (LCC)
For pavements in FAIR condition (70ltPCRlt80)all
treatments are cost-effective except NovaChip
used on low volume composite pavement.
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• Interim Findings of ODOT PM Study

Table 4 Treatment Effectiveness on Pavements in
GOOD Condition (LCC)
For pavements in GOOD condition (80ltPCRlt90)most
treatments are NOT cost-effective except
Smoothseal, Chip Seal (low traffic, flexible) and
Thin HMA OLay w/Rprs. (high traffic, composite).
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Questions ?