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
• 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
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
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
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