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PERVIOUS CONCRETE Presented by Tom Evans, Executive Director of the Maryland Ready Mix Concrete Association February 5, 2014

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PERVIOUS CONCRETE

Presented by Tom Evans, Executive Director

of theMaryland Ready Mix

Concrete AssociationFebruary 5, 2014

The Maryland Ready Mix Concrete Association (MRMCA) is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-AIA members are available on request.

This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing or dealing in any material or product. Questions related to specific materials, methods and services will be addressed at the conclusion of this presentation.

LEARNING OBJECTIVES

• Pervious concrete pavements are part of an engineered system

– for managing storm water

– for supporting traffic loads

• Current recommendations, specifications and standards

• Local projects and resources

Today’s presentation …

• Properties• Applications• Reasons• Design• Projects• Resources

• A Portland Cement Concrete mixture

• 15% to 25% air voids

• 100 to 120 lbs/ft3 unit weight

• Mix should be designed and acceptedbased on air void structure and unit weight criteria

• Consider the placing equipment

Properties of Pervious Concrete

Roads

Erosion Control

Parking Lots

New Development

Driveways

Critical Sites

Why Pervious Concrete?

• Conserve Water Resources

• Treat / Control / Reduce Runoff

• Combine with Drainage Facilities

• Lower Urban Heat Islands

• Green Building Practice

• Land Utilization

• Environmental Compliance

• Overall Project Cost

• Cost Savings to Municipalities / Owners

Why…

Westminster, MD•5 acres of pervious

•Owner saved $400K •Eliminated 1 ½ acre pond

Permeable pavements typically consist of a porous surface course and open graded stone base/subbase or sand drainage system. Stormwater drains through the surface course, is captured in the drainage system, and infiltrates into the surrounding soils. Permeable pavements significantly reduce the amount of impervious cover, provide water quality and groundwater recharge benefits, and may help mitigate temperature increases.

Why Pervious Concrete?

Design• Part of a system

• Soil conditions / infiltration rate

• Storm water control

• Traffic loads

• PerviousPave software available

• ACI 522.1-13 Guide Specification

Testing•ASTM Sub-committee C09.49•1688 Density and Void Content of Freshly Mixed Pervious Concrete

•1701 Infiltration Rate of In-Place Pervious Concrete

•1747 Impact and Abrasion Resistance

•1754 Density of Hardened Pervious Concrete

•Working on Compressive Strength

Sample Panels

Pervious Concrete

Aggregate Base

Subgrade

Curb Pervious Concrete

Aggregate Base

Subgrade

Curb

Details

Maintenance Plan

• Starts with site design

• Elevations, transitions, run-on

• Timing, schedules

• Procedures

• Equipment

Projects

• Parking Lots

• Alley way

• Driveways

• Golf cart path

• Nature Trails

• Sidewalks

Westminster, MD

Shelter Systems

Woodbine

Chevy Chase

Calvert County

• Northwood High School (Silver Spring)

• Pervious sidewalks Montgomery County

• Smithsonian Environmental Research Center (SERC)Edgewater MD

• Demonstration area at Queen Anne’s County DPW

Corsica Watershed

Poolesville Town Hall

W. Montgomery Alley

Peninsula RegionalMedical Center

Towson University

Camden Yards

Orchard Meadows – Ellicott City

Arby’s & CVS - Cumberland

Forsgate, NJ

MDOT Park and Rides

• SHA in Waysons Corner

• SHA at MD 439 and I-83

• MTA in Waldorf

Where to find what?• Concrete.org

– ACI Committee 522• ACI 522.1-13 Guide Specification

• NRMCA.org– Certification

• For contractors and testing technicians

• MarylandConcrete.com– Project locations

– Referrals

So…what’s the latest on pervious concrete?

• ASTM Tests 1688, 1701, 1747, 1754, ?• ACI 522.1-13 Specification• State and Local Environmental Regs• Mix Designs• Placing and Finishing Equipment• Certified Contractors• Maintenance Programs / Equipment

Questions?

Thank You!