perviou concret e -...

Pervious Concrete

2012 MdQI Conference

Quality Transportation- A Hybrid Approach

Rod Meyers, P.E., CDT BASF Chemical Admixtures

2012 MdQI Conference Quality Transportation- A Hybrid Approach

Our Watershed

http://www.choosecleanwater.org/cms/sites/default/files/images/chesbay.jp


Peninsula Medical Center, Salisbury Maryland


Peninsula Medical Center Salisbury Maryland


Robinson Nature Center, Howard County, Maryland


Measuring Fresh Density

and Voids ASTM C1688 Density and Void Content

of Freshly Mixed Pervious Concrete 0.25 ft3

measure (standard air pot)

Standard Proctor Hammer


Sample ASTM C172

Fill in 2 lifts

Drop hammer full 12”

Drop 20 times/lift

ASTM C1688


ASTM C1688 Test Data Date Truck Number Density(lb/ft3) Voids (%)

11/18/10 Test Panel 126.4 21

12/2/10 28 124.4 20

12/2/10 141 127.6 20

12/3/10 91 126.0 21

12/3/10 111 128.4 20

12/4/10 30 124.8 22

12/4/10 89 129.2 19

12/11/10 109 125.6 21

12/1110 91 123.6 23

12/15/10 129.6 19

Average 126.6 21

Range 124.4 – 129.6 19-23


ASTM C1688 Void Contents


Monitor Infiltration Capacity

• ASTM C1701

• Infiltration Rate of In

Place Pervious Concrete


ASTM C1688 Test Data Test Mass of

Water

(lbs)

Infiltration

time

(seconds)

Infiltration

Rate

(inches/hour)

1 40 90 seconds 410

2 40 80 seconds 460

3 8 22 seconds 330

MDE Stormwater Design Manual


Clemson Corner Frederick, Maryland


Townhall, Poolesville, Maryland


Retail/Office Building 4825 Butler Rd, Glyndon


North Bethesda Methodist Church Bethesda, Maryland


ACI 552-10, Report on Pervious

Concrete, section 3.3.1.1 Parking Lots

“The practical

range of design

thicknesses for

pervious

concrete

pavements is

from 5 to 12 in

for plain parking

lots.”


How can we measure

strength?


The American Concrete Institute

Committee Report ACI 522R-Pervious

Concrete, Chapter 7.2.2 states: “Guidance for structural design of conventional concrete

pavements is provided in ACI 330R for parking lots and in ACI

325.12R for streets and roads. These documents cover many

different aspects of paving design. The structural design

recommendations in these documents, however, are not necessarily

applicable for use with pervious pavement.

As there are no standardized test

methods for strength of pervious

concrete, design and specification by

strength should be avoided”.


Flexural Strength vrs. Void Content

0

100

200

300

400

500

600

700

0 5 10 15 20 25 30 35

Void Content, percent by volume

28

-day

Fle

xu

ral

Str

en

gth

, p

si

Best Fit Line

Data

Flexural Strength, Fmr = 832.8 – 20.3 * (void content, %), psi


Reservoir Layer


Subbase Improves Structural Capacity


PerviousPave Software American Concrete Pavement

Association

PerviousPave available on the ACPA website at: www.pavement.com

http://www.pavement.com/

http://www.pavement.com/


Pervious Pavements Parking lots

Streets/roads shoulders

Sidewalks

Driveways

Light traffic areas


YMCA Westminister, Maryland


Clemson Corner Frederick, Maryland


Morgan University Baltimore, Maryland


Clemson Corner, Frederick, Maryland


Pervious concrete pavements are susceptible to collecting debris

YMCA, Westminster


Low maintenance begins with good mix design

Improves

Permeability,

Freeze-thaw

Resistance


Good curing

provides

durable

surface

Cherry Hill Nursing Home


Low maintenance depends on good site design

Avoid

adjacent

areas

that

contribute

debris

North Bethesda Methodist Church


Low maintenance depends on good site design

Avoid dirty water run-on. Morgan University


Protect during construction Cherry Hill Nursing Home


Plan for maintenance


Cleaning


Alternate Method of Cleaning

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