Pervious Concrete - The Concrete That Drinks
Pervious Concrete - The Concrete That Drinks
Pervious Concrete - The Concrete That Drinks
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<strong>Pervious</strong> <strong>Concrete</strong><br />
<strong>The</strong> <strong>Concrete</strong> <strong>That</strong> <strong>Drinks</strong><br />
Presented by:<br />
Kenneth Justice, P.E., LEED ® AP<br />
Promotion Director for NJ/DE
What is <strong>Pervious</strong> <strong>Concrete</strong>?<br />
• 15-25% Void Space<br />
• Also Called No-fines <strong>Concrete</strong>
Better Land Use<br />
• Elimination or reduction of expensive<br />
detention/retention ponds or underground storage,<br />
making more land available for development
Solution to Stormwater Management<br />
STORMWATER IN<br />
PERVIOUS<br />
CONCRETE<br />
PAVEMENT<br />
AGGREGATE<br />
BASE<br />
STORMWATER OUT<br />
SUBGRADE
Texture Comparison
Parking Lots<br />
Moorestown, NJ<br />
Newark, NJ
Driveways<br />
Philadelphia, PA
Sidewalks<br />
Hopewell Township, NJ<br />
Sussex County YMCA, NJ
Streets, Alleys, Cul-de<br />
de-sac’s<br />
Cape May, NJ<br />
Lambertville, NJ
Heavy-Duty<br />
Loading Dock<br />
Forsgate Industrial Park, Cranbury, NJ
Protects Trees<br />
• Can pave within the drip line<br />
• Water and air filters to roots
Nature Paths/Parks<br />
Herschfield Park,<br />
Pompton Lakes, NJ<br />
Hogan Park, Northvale, NJ
<strong>The</strong> pavement can drain the equivalent of<br />
275” – 450” of rain per hour!<br />
Note: <strong>The</strong> 100 year storm in NJ is roughly 8.75 inches per hour<br />
Hershfield Park, Pompton Lakes, NJ<br />
Placed September 2009
• NJ Dept. of Environmental<br />
Protection BMP Manual,<br />
Chapter 9.7 revisions<br />
– Working with the Director<br />
of the Watershed<br />
Management Program,<br />
Sandra Blick, to revise the<br />
BMP manual<br />
– New revision to be<br />
circulated June ‘08
Stormwater is Polluted<br />
• Oils and Greases<br />
• Metals<br />
• Sediments<br />
• Fertilizers
Pollution Treatment<br />
• About 90% of the surface<br />
pollutants are carried off by<br />
the first ½-inch to 1-inch 1<br />
of<br />
rainfall (first flush)<br />
• First flush passes through<br />
pavement into soil<br />
• Soil filters and treats rainfall<br />
• Rainfall is spread over entire<br />
parking area (instead of<br />
detention pond)<br />
C.B. Lamb Elementary School<br />
Wrightstown, NJ<br />
Hydrocarbons treated by<br />
filtration and microbial<br />
conversion
EPA Study in Edison, NJ<br />
<strong>Pervious</strong><br />
<strong>Concrete</strong><br />
<strong>Pervious</strong><br />
<strong>Concrete</strong><br />
Permeable<br />
Pavers<br />
Porous<br />
asphalt<br />
Paving completed October 2009
Meets LEED Requirements<br />
• Reduce stormwater<br />
runoff<br />
• Use Recycled<br />
Materials<br />
• Use Regional<br />
Materials<br />
• Reduce urban heat<br />
islands
Traffic markings are no problem with <strong>Pervious</strong> <strong>Concrete</strong>
<strong>Pervious</strong> <strong>Concrete</strong> can be colored and stamped too!<br />
Sussex County YMCA<br />
Placed June 2008
3 Questions<br />
1. Freeze/Thaw<br />
2. Maintenance<br />
3. Cost
Freeze/Thaw
Can <strong>Pervious</strong> <strong>Concrete</strong><br />
Withstand Freeze-Thaw?<br />
• 15-25% void structure and high infiltration<br />
rate means little moisture trapped in matrix<br />
• Expansion of moisture due to freezing does<br />
not exert undue pressures on matrix<br />
• 0.25-0.35 0.35 W/C equals high quality paste<br />
• Can withstand over 300 freeze/thaw cycles<br />
fully saturated without damage
Freeze Thaw Comparison<br />
• Melting snow on impervious<br />
pavements can become “black ice”
Freeze Thaw Comparison<br />
• Melting snow on a pervious concrete parking lot does not<br />
leave a “trail” of water that could become black ice<br />
• Melting snow goes through the pavement
Maintenance
After Cleaning<br />
Before Cleaning
Broom and/or garden hose<br />
Leaf Blower
Power Blower<br />
Power Washing<br />
Vacuuming
Vacuum Sweeper
Cost
Cost of laying pervious pavement exceeds that<br />
of traditional pavement, historically:<br />
• <strong>Pervious</strong> concrete is approximately 4%-15% higher<br />
than regular concrete PER YARD,<br />
BUT . . .<br />
• Higher installation costs can be off-set by elimination<br />
of the need for curbs, gutters, storm drains and large<br />
retention ponds.
How much does it cost????<br />
Given: 100,000 SF parking lot<br />
6” pervious concrete +<br />
12” aggregate<br />
recharge bed, installed<br />
= $355,000<br />
4” asphalt + 8” 8<br />
aggregate base =<br />
$285,000
6” pervious concrete +<br />
12” aggregate<br />
recharge bed, installed<br />
= $355,000<br />
4” asphalt + 8” 8 aggregate base<br />
= $285,000<br />
+<br />
Inlets = $25,000<br />
18” Pipe = $85,000<br />
1 acre detention pond with<br />
land cost = $135,000<br />
= $530,000
<strong>Pervious</strong> <strong>Concrete</strong> Contractor<br />
Training & NRMCA Certification<br />
Over 100 contractors and 12<br />
RMC producers in data base<br />
for NJ/DE/NYC
Questions???<br />
<strong>Concrete</strong> home<br />
survives Hurricane Ike<br />
at Gilchrist, Texas<br />
September 2008
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