Pervious Concrete - The Concrete That Drinks

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Pervious Concrete - The Concrete That Drinks

Pervious Concrete

The Concrete That Drinks

Presented by:

Kenneth Justice, P.E., LEED ® AP

Promotion Director for NJ/DE


What is Pervious Concrete?

• 15-25% Void Space

• Also Called No-fines Concrete


Better Land Use

• Elimination or reduction of expensive

detention/retention ponds or underground storage,

making more land available for development


Solution to Stormwater Management

STORMWATER IN

PERVIOUS

CONCRETE

PAVEMENT

AGGREGATE

BASE

STORMWATER OUT

SUBGRADE


Texture Comparison


Parking Lots

Moorestown, NJ

Newark, NJ


Driveways

Philadelphia, PA


Sidewalks

Hopewell Township, NJ

Sussex County YMCA, NJ


Streets, Alleys, Cul-de

de-sac’s

Cape May, NJ

Lambertville, NJ


Heavy-Duty

Loading Dock

Forsgate Industrial Park, Cranbury, NJ


Protects Trees

• Can pave within the drip line

• Water and air filters to roots


Nature Paths/Parks

Herschfield Park,

Pompton Lakes, NJ

Hogan Park, Northvale, NJ


The pavement can drain the equivalent of

275” – 450” of rain per hour!

Note: The 100 year storm in NJ is roughly 8.75 inches per hour

Hershfield Park, Pompton Lakes, NJ

Placed September 2009


• NJ Dept. of Environmental

Protection BMP Manual,

Chapter 9.7 revisions

– Working with the Director

of the Watershed

Management Program,

Sandra Blick, to revise the

BMP manual

– New revision to be

circulated June ‘08


Stormwater is Polluted

• Oils and Greases

• Metals

• Sediments

• Fertilizers


Pollution Treatment

• About 90% of the surface

pollutants are carried off by

the first ½-inch to 1-inch 1

of

rainfall (first flush)

• First flush passes through

pavement into soil

• Soil filters and treats rainfall

• Rainfall is spread over entire

parking area (instead of

detention pond)

C.B. Lamb Elementary School

Wrightstown, NJ

Hydrocarbons treated by

filtration and microbial

conversion


EPA Study in Edison, NJ

Pervious

Concrete

Pervious

Concrete

Permeable

Pavers

Porous

asphalt

Paving completed October 2009


Meets LEED Requirements

• Reduce stormwater

runoff

• Use Recycled

Materials

• Use Regional

Materials

• Reduce urban heat

islands


Traffic markings are no problem with Pervious Concrete


Pervious Concrete can be colored and stamped too!

Sussex County YMCA

Placed June 2008


3 Questions

1. Freeze/Thaw

2. Maintenance

3. Cost


Freeze/Thaw


Can Pervious Concrete

Withstand Freeze-Thaw?

• 15-25% void structure and high infiltration

rate means little moisture trapped in matrix

• Expansion of moisture due to freezing does

not exert undue pressures on matrix

• 0.25-0.35 0.35 W/C equals high quality paste

• Can withstand over 300 freeze/thaw cycles

fully saturated without damage


Freeze Thaw Comparison

• Melting snow on impervious

pavements can become “black ice”


Freeze Thaw Comparison

• Melting snow on a pervious concrete parking lot does not

leave a “trail” of water that could become black ice

• Melting snow goes through the pavement


Maintenance


After Cleaning

Before Cleaning


Broom and/or garden hose

Leaf Blower


Power Blower

Power Washing

Vacuuming


Vacuum Sweeper


Cost


Cost of laying pervious pavement exceeds that

of traditional pavement, historically:

Pervious concrete is approximately 4%-15% higher

than regular concrete PER YARD,

BUT . . .

• Higher installation costs can be off-set by elimination

of the need for curbs, gutters, storm drains and large

retention ponds.


How much does it cost????

Given: 100,000 SF parking lot

6” pervious concrete +

12” aggregate

recharge bed, installed

= $355,000

4” asphalt + 8” 8

aggregate base =

$285,000


6” pervious concrete +

12” aggregate

recharge bed, installed

= $355,000

4” asphalt + 8” 8 aggregate base

= $285,000

+

Inlets = $25,000

18” Pipe = $85,000

1 acre detention pond with

land cost = $135,000

= $530,000


Pervious Concrete Contractor

Training & NRMCA Certification

Over 100 contractors and 12

RMC producers in data base

for NJ/DE/NYC


Questions???

Concrete home

survives Hurricane Ike

at Gilchrist, Texas

September 2008

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