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James J. Purcell, PE, PMP
Technical Director, New Jersey Asphalt Pavement Association
Presentation to the 60th Annual
NJ Asphalt Paving Conference
March 14, 2017
Ewing, NJ
 Reduce impervious
surface
 Recharge ground
water
 Improve water
quality
 Eliminate need for
detention basins
 Reduce permitting
requirements
Why Porous Pavements?
 Reduces
hydroplaning
 Reduces glare
 Reduces backspray
 Reduced tire-
pavement noise
 Less susceptible to
frost
 Reduces use of de-
icing chemicals
Why Porous Pavements?
 Subgrade condition
◦ Sand?
◦ Silt?
◦ Clay?
 Seasonal high
groundwater table
 Discharge system?
◦ Infiltration
◦ Mechanical (Underdrain)
Graphic courtesy of NJDEP
Important Considerations
 Geotextile
◦ Non-woven AASHTO M288 Class 2 (NJDOT
Specification 919.01)
 Stabilization course
◦ ½” Stone (AASHTO No. 7- NJDOT Specification
901.03)
 Reservoir bed
◦ 2”-3” Stone (AASHTO No. 2 – NJDOT Specification
901.03)
 Choker course
◦ 1” Stone (AASHTO No. 57 – NJDOT Specification
901.03)
 Asphalt base course
◦ Asphalt Stabilized Drainage Course (ASDC) (NJDOT
Specification 902.06)
 Asphalt surface course
◦ Open Graded Friction Course (OGFC) (NJDOT
Specification 902.03)
 Binder
◦ 64E-22 (polymer modified)
Engineering judgment is required to determine
if a stabilization course is necessary.
A stabilization course should be used if there is
a potential for the subgrade to compress or to
be subject to lateral movement during
construction.
Per NJDEP proposed best practices:
 Storage bed aggregate must be clean,
uniformly-graded broken stone whose size
designation is appropriate for the surface
course desired and design load conditions.
The stone must be washed, prior to
placement, to minimize the amount of stone
dust and other fine particles that can clog the
surface of the subsoil.
Per NJDEP proposed best practices:
 The choker course must consist of clean,
washed broken stone whose size designation
is appropriate for the surface course desired
and design load conditions. The smallest size
designation that may be used is AASHTO No.
57.
The choker course will lock in the reservoir
bed, providing a smooth surface for paving.
Use polymer modified binder 64E-22 in surface
course
 Especially critical for parking lots, polymer
modified binder will minimize scuffing due to
power steering
 Also consider Warm Mix additives – increased
film thickness and better workability
 Both add to durability and service life
 Excavate bed to
plan elevation using
equipment w/ “soft
footprint”
 Don’t compact
subgrade*
 Spread geotextile
immediately after fine
grading
 Overlap fabric >16”
 Install drainage pipes
if used
 Excess fabric (>4’)
folded over agg. later
 For systems designed for quantity control
only, an outlet control structure will be
required
Graphic courtesy of NJDEP
 Place clean, single size,
washed aggregate.
 Do not drive trucks on
fabric
 Spread and grade with
tracked equipment in
8” lifts
 Light compaction -
static
 Protect pipes
 Place “Choker”
course – ½” clean
washed aggregate.
◦ Purpose to lock up
surface for stable
paving platform
◦ 1 – 2” thick
◦ Grade and compact
 Static
 Vibratory? – (maybe -
with low amplitude, high
frequency)
 Paving as usual?
◦ Recommend track paver
◦ Less rolling required
 Avoid truck movement
over aggregate
◦ Stability may be an issue
◦ Avoid disturbing
aggregate surface – but
it will happen
 Plan for Production to
be less than normal
 Use Static compaction
 Breakdown with a 10
ton steel wheel roller
(2 – 4 passes – check
with nuclear density
gauge)
 Finish with a 3.5-5
ton roller
Rolling Temperature is Critical
Ambient Temperature 50 to 70°
Wind speed ideally 0 to 3 mph
Beware of asphalt surface cooling too quickly
No paving of Surface Course under 50°
Rolling Temperature is Critical
Asphalt Surface Course – 200-220°
Finish Rolling Base Course – 140-150°
Asphalt Base Course – 200-245°
Finish Rolling Surface Course – 110-140°
Rolling Temperature is Critical
 Limit traffic for 48
hours to allow to set
up
 Keep sediment
control in place until
vegetation is
established
 Protect your investment with proper soil
erosion and sediment controls
 Grade adjacent
areas to be
vegetated away
from the work,
creating
swales, if
possible
 Construct a test strip
◦ Use to calibrate nuclear density gauge
◦ Determine rolling pattern
 Base Course air
voids target is 25%
or more
 Surface Course air
voids target is 15%
or more
 Check for density
◦ Nuclear gauge
 Base Course air
voids target is 25%
or more
 Surface Course air
voids target is 15%
or more
 Check for permeability
(NJDEP BMP = 6.4 in/hr for
quality, 20.0 in/hr for quantity)
◦ Hose test
◦ Bucket test
◦ ASTM C1701
Proper maintenance is critical to the success of
pervious pavement systems.
 DO NOT use a pervious pavement for storage
of any materials
 DO Inspect the surface course annually for
any distress – repair areas by removal and
replacement of the surface course in kind
 DO NOT use sealers or coatings of any kind
that will clog the surface
 DO Vacuum the surface course at least four
times per year (DO NOT power sweep!)
 DO power wash after vacuuming
 DO NOT set plow blades to a level that will
damage the surface
 DO NOT allow plowed snow to accumulate on
the surface (have an area off pavement for
snow storage)
 DO NOT use sand,
cinders, or any de-
icing materials that do
not dissolve in solution
 DO maintain adjacent
vegetated areas
• A key to performance: high
quality CLEAN stone
base/reservoir course
• For fine grained soils reservoir
course should be a min of 18”
• For thicker, multiple lift asphalt
sections, you can eliminate the
choker course
• Asphalt Base should be ASDC
• Asphalt Surface should be
OGFC with polymer-modified
binder (64E-22)
General Observations
 Not using polymer-modified binder in
surface course
 Compacting outside optimal temperature
ranges
 Not properly rolling choker course
 Ignoring compaction – proper compaction
will not clog pores if proper gradation used
 Beginning with an uneven subgrade - must
be flat and uncompacted*
Common Porous Mix Problems
Resources
NJAPA – www.njapa.com
NAPA – www.asphaltpavement.org
NJDEP – www.state.nj.us/dep and the New
Jersey Stormwater Best Management Practices
Manual -
http://www.nj.gov/dep/stormwater/bmp_ma
nual/NJ_SWBMP_9.7.pdf
Publications
National Asphalt Pavement Association
PS-33 - Porous Asphalt Pavements
IS-131 – Porous Asphalt Pavements for
Stormwater Management
FHWA HIF 15-009 – Porous Asphalt Tech Brief
Publications
New Jersey Asphalt
Pavement Association
Asphalt Pavement Design
Guide
Publications
Asphalt Institute
MS-2 – Mix Design Methods
SP-2 – Superpave Mix Design
MS-4 - The Asphalt Handbook
MS-22 – HMA Construction
MS-26 – Asphalt Binder Handbook
Acknowledgements
Thomas Baird, PE, Barton & Loguidice, D.P.C.
John Hickey, Asphalt Pavement Association of Oregon
Mike Skinner, PE, Colorado Asphalt Pavement Assoc.
Cliff Ursich, PE, Flexible Pavements of Ohio
Wayne Byard, Traprock Industries
Contact:
Jim Purcell, Technical Director
New Jersey Asphalt Pavement Association
850 Bear Tavern Road
Suite 108
Ewing, NJ 08691
(609) 838-1867 (o)
(609) 498-5753 (c)
james@njapa.com

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James Purcell "Porous Asphalt Pavement for Storm Water Management" March 14, 2017

  • 1. James J. Purcell, PE, PMP Technical Director, New Jersey Asphalt Pavement Association Presentation to the 60th Annual NJ Asphalt Paving Conference March 14, 2017 Ewing, NJ
  • 2.
  • 3.  Reduce impervious surface  Recharge ground water  Improve water quality  Eliminate need for detention basins  Reduce permitting requirements Why Porous Pavements?
  • 4.  Reduces hydroplaning  Reduces glare  Reduces backspray  Reduced tire- pavement noise  Less susceptible to frost  Reduces use of de- icing chemicals Why Porous Pavements?
  • 5.  Subgrade condition ◦ Sand? ◦ Silt? ◦ Clay?  Seasonal high groundwater table  Discharge system? ◦ Infiltration ◦ Mechanical (Underdrain) Graphic courtesy of NJDEP Important Considerations
  • 6.
  • 7.  Geotextile ◦ Non-woven AASHTO M288 Class 2 (NJDOT Specification 919.01)  Stabilization course ◦ ½” Stone (AASHTO No. 7- NJDOT Specification 901.03)  Reservoir bed ◦ 2”-3” Stone (AASHTO No. 2 – NJDOT Specification 901.03)  Choker course ◦ 1” Stone (AASHTO No. 57 – NJDOT Specification 901.03)
  • 8.  Asphalt base course ◦ Asphalt Stabilized Drainage Course (ASDC) (NJDOT Specification 902.06)  Asphalt surface course ◦ Open Graded Friction Course (OGFC) (NJDOT Specification 902.03)  Binder ◦ 64E-22 (polymer modified)
  • 9. Engineering judgment is required to determine if a stabilization course is necessary. A stabilization course should be used if there is a potential for the subgrade to compress or to be subject to lateral movement during construction.
  • 10. Per NJDEP proposed best practices:  Storage bed aggregate must be clean, uniformly-graded broken stone whose size designation is appropriate for the surface course desired and design load conditions. The stone must be washed, prior to placement, to minimize the amount of stone dust and other fine particles that can clog the surface of the subsoil.
  • 11. Per NJDEP proposed best practices:  The choker course must consist of clean, washed broken stone whose size designation is appropriate for the surface course desired and design load conditions. The smallest size designation that may be used is AASHTO No. 57. The choker course will lock in the reservoir bed, providing a smooth surface for paving.
  • 12. Use polymer modified binder 64E-22 in surface course  Especially critical for parking lots, polymer modified binder will minimize scuffing due to power steering  Also consider Warm Mix additives – increased film thickness and better workability  Both add to durability and service life
  • 13.
  • 14.
  • 15.  Excavate bed to plan elevation using equipment w/ “soft footprint”  Don’t compact subgrade*
  • 16.  Spread geotextile immediately after fine grading  Overlap fabric >16”  Install drainage pipes if used  Excess fabric (>4’) folded over agg. later
  • 17.  For systems designed for quantity control only, an outlet control structure will be required Graphic courtesy of NJDEP
  • 18.  Place clean, single size, washed aggregate.  Do not drive trucks on fabric  Spread and grade with tracked equipment in 8” lifts  Light compaction - static  Protect pipes
  • 19.  Place “Choker” course – ½” clean washed aggregate. ◦ Purpose to lock up surface for stable paving platform ◦ 1 – 2” thick ◦ Grade and compact  Static  Vibratory? – (maybe - with low amplitude, high frequency)
  • 20.  Paving as usual? ◦ Recommend track paver ◦ Less rolling required  Avoid truck movement over aggregate ◦ Stability may be an issue ◦ Avoid disturbing aggregate surface – but it will happen  Plan for Production to be less than normal
  • 21.  Use Static compaction  Breakdown with a 10 ton steel wheel roller (2 – 4 passes – check with nuclear density gauge)  Finish with a 3.5-5 ton roller
  • 22. Rolling Temperature is Critical Ambient Temperature 50 to 70° Wind speed ideally 0 to 3 mph Beware of asphalt surface cooling too quickly No paving of Surface Course under 50°
  • 23. Rolling Temperature is Critical Asphalt Surface Course – 200-220° Finish Rolling Base Course – 140-150° Asphalt Base Course – 200-245° Finish Rolling Surface Course – 110-140° Rolling Temperature is Critical
  • 24.  Limit traffic for 48 hours to allow to set up  Keep sediment control in place until vegetation is established
  • 25.
  • 26.  Protect your investment with proper soil erosion and sediment controls  Grade adjacent areas to be vegetated away from the work, creating swales, if possible
  • 27.  Construct a test strip ◦ Use to calibrate nuclear density gauge ◦ Determine rolling pattern  Base Course air voids target is 25% or more  Surface Course air voids target is 15% or more
  • 28.  Check for density ◦ Nuclear gauge  Base Course air voids target is 25% or more  Surface Course air voids target is 15% or more
  • 29.  Check for permeability (NJDEP BMP = 6.4 in/hr for quality, 20.0 in/hr for quantity) ◦ Hose test ◦ Bucket test ◦ ASTM C1701
  • 30.
  • 31. Proper maintenance is critical to the success of pervious pavement systems.  DO NOT use a pervious pavement for storage of any materials  DO Inspect the surface course annually for any distress – repair areas by removal and replacement of the surface course in kind  DO NOT use sealers or coatings of any kind that will clog the surface
  • 32.  DO Vacuum the surface course at least four times per year (DO NOT power sweep!)  DO power wash after vacuuming
  • 33.  DO NOT set plow blades to a level that will damage the surface  DO NOT allow plowed snow to accumulate on the surface (have an area off pavement for snow storage)  DO NOT use sand, cinders, or any de- icing materials that do not dissolve in solution  DO maintain adjacent vegetated areas
  • 34.
  • 35. • A key to performance: high quality CLEAN stone base/reservoir course • For fine grained soils reservoir course should be a min of 18” • For thicker, multiple lift asphalt sections, you can eliminate the choker course • Asphalt Base should be ASDC • Asphalt Surface should be OGFC with polymer-modified binder (64E-22) General Observations
  • 36.  Not using polymer-modified binder in surface course  Compacting outside optimal temperature ranges  Not properly rolling choker course  Ignoring compaction – proper compaction will not clog pores if proper gradation used  Beginning with an uneven subgrade - must be flat and uncompacted* Common Porous Mix Problems
  • 37. Resources NJAPA – www.njapa.com NAPA – www.asphaltpavement.org NJDEP – www.state.nj.us/dep and the New Jersey Stormwater Best Management Practices Manual - http://www.nj.gov/dep/stormwater/bmp_ma nual/NJ_SWBMP_9.7.pdf
  • 38. Publications National Asphalt Pavement Association PS-33 - Porous Asphalt Pavements IS-131 – Porous Asphalt Pavements for Stormwater Management FHWA HIF 15-009 – Porous Asphalt Tech Brief
  • 39. Publications New Jersey Asphalt Pavement Association Asphalt Pavement Design Guide
  • 40. Publications Asphalt Institute MS-2 – Mix Design Methods SP-2 – Superpave Mix Design MS-4 - The Asphalt Handbook MS-22 – HMA Construction MS-26 – Asphalt Binder Handbook
  • 41. Acknowledgements Thomas Baird, PE, Barton & Loguidice, D.P.C. John Hickey, Asphalt Pavement Association of Oregon Mike Skinner, PE, Colorado Asphalt Pavement Assoc. Cliff Ursich, PE, Flexible Pavements of Ohio Wayne Byard, Traprock Industries
  • 42. Contact: Jim Purcell, Technical Director New Jersey Asphalt Pavement Association 850 Bear Tavern Road Suite 108 Ewing, NJ 08691 (609) 838-1867 (o) (609) 498-5753 (c) james@njapa.com