Why Porous Pavement? - Lake George Association

Why Porous Pavement?
Beach Road is an ideal candidate for porous
pavement
– High priority resource to be protected
– Construction using porous pavement can be cost-neutral or
even a savings over traditional design, with greatly improved
lake protection
– Traditional stormwater management options are very limited
due to high water table
– Very good likelihood of grant funding to help with project
– Can be an excellent demonstration project with regional and
even national significance, at no additional cost to Warren
County

Will it Work?
New porous pavement mix technologies have been very
successful in the Northeast and other Northern states
UNH Stormwater Center, NY Construction Materials
Association, and other professional assistance available
Existing Project Examples:
– Maine Mall Road, Maine
– Boulder Hills Subdivision, New Hampshire
– Oregon, numerous projects
– BBL Construction Parking lot (22 years in place)
– Great Oaks Office Park (20 years in place)
– Albany Nanotech Center lot – just going in

‣ Installationof900’ ofthefirst
porousasphaltprivate
residentialroadinthe
Northeast
‣ Slope29%
‣ LowImpactDevelopment
subdivision
‣ SiteisnearlyZero
stormwaterdischarge
5

Significant advancements in porous asphalt
strength, durability, and production costs have
been achieved
Large increase in significant PA installs for light
duty, residential, commercial, and state road
applications
13

Sieve Size (inch/mm) Percent Passing (%)
0.75/19 100
0.50/12.5 85-100
0.375/9.5 55-75
No.4/4.75 10-25
No.8/2.36 5-10
No.200/0.075 (#200) 2-4
Binder Content (AASHTO T164) 6 - 6.5%
Fiber Content by Total Mixture Mass 0.3% cellulose or
0.4% mineral
Rubber Solids (SBR) Content by Weight of the 1.5-3% or TBD
Bitumen
Air Void Content
16.0-22.0%
(ASTM D6752/AASHTO T275)
Draindown (ASTM D6390)* < 0.3 %
Retained Tensile Strength (AASHTO 283)** > 80 %
Cantabro abrasion test on unaged samples
< 20%
(ASTM D7064-04)
Cantabro abrasion test on 7 day aged samples < 30%
15

Repairs Repairs may be needed from cuts for utilities
Repairs Repairs can be made with standard HMA for most
damages up to 15% of surface area
PA PA can be repaired by heating and rerolling
When When pavement reaches end of life, it is replaced
by milling to choker coarse.
16

Salt Reduction and Porous Asphalt
% Ice Cover
% Ice Cover
100
90
80
70
60
50
40
30
20
10
0
Dense Mix Asphalt
Porous Asphalt
100 50 25 0
% Salt Application

Weighted Skid Resistance (BPN)
Skid Resistance (BPN)
100
90
80
70
60
50
40
30
20
10
0
100 50 25 0
Dense Mix Asphalt
Porous Asphalt
% Salt Application

Maine Mall Road Porous Pavement Project
South Portland, Maine
In since November, 2009, and no
pavement degradation to date
No black ice, No splash, No hydroplaning
Project Cost 4% more than traditional
design, but used underdrains and
collection system due to clay soils

Traffic Loads and Counts
Maine Mall Road
– .35 miles length
Beach Road
– .8 miles length
– AADT 16,750 vehicles per day
– AADT 8,200 vehicles per day
– ESALs 3,277,700
– ESALs ~1.2 the Maine #
– Design hourly volume 2,412
– Design hourly volume 772
– Heavy Trucks 5%
– Heavy Trucks 5%
Summary: Beach Road is about ½ (or less) of the traffic
loads than the Maine Mall Road Porous Pavement Project

Maintenance
Contract with vacuum sweeper company,
cleaned 4-64
6 times per year depending on
sediment tracking onto road.
Plus: Very few sources of sediment
tracked onto Beach Road
No catch basin or pipe cleanouts
Cost of maintenance agreement offset by
savings in salt applictions