Pervious Concrete Applications and Stormwater Management John Kevern Ph.D., LEED AP Louisiana Transportation Conference Baton Rouge 1/10/11

Transcription

1 Pervious Concrete Applications and Stormwater Management John Kevern Ph.D., LEED AP Louisiana Transportation Conference Baton Rouge 1/10/11 1/20/2011:1

2 Overview Pervious Concrete Background Design Considerations Typical Construction Operations Operation and Maintenance Considerations Applications 1/20/2011:2

3 Low Impact Development Pre-Development Post-Development Low-Impact Development

4 Urbanization Affects Hydrology * PCA Hydrology manual

5 How Do Permeable Pavements Work? Permeable Pavement Aggregate base 40 % voids Natural Soil

6 Pollution Treatment About 90% of the surface pollutants are carried off by the first ½-inch to 1-inch 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)

7 Can pave within the drip line Water and air filters to roots Protects Trees

8 Reduce Urban Heat Islands

9 Urban Heat Islands 6 12 F Hotter More Smog Occurrences High Level of Ground- Level Ozone More Frequent Air Quality Alerts Increased Health Problems Higher Energy Demand

10 Infiltration-based BMP Flat base ideal Pavement Design Ferguson 2005

11 Pavement Design Pooling French drains Check-dams Tennis et al. 2004

12 Full Exfiltration 1/20/2011:12 Jones 2008

13 Partial Exfiltration 1/20/2011:13 Jones 2008

14 No Exfiltration 1/20/2011:14 Jones 2008

15 Mix Design Considerations Balancing Act Aggregates, binder, water, admixtures Aggregate Paste Traditional Concrete Aggregate Paste Pervious Concrete Aggregate Voids 1/20/2011:15 Air-entrained paste

16 Construction - Excavation PCC PCPC Do not compact subbase too much, needs to be permeable

17 Construction - Excavation PCC PCPC bath tub

18 Construction Aggregate base But, compact the base enough

19 Typical Concrete Placement Pile and Rake method

20 Typical Concrete Placement

21 1/20/2011:21 Concrete Finishing

22 Construction Jointing Every 20 feet or match with existing

23 Construction Concrete Curing Cure 7-days minimum

24 Operation and Maintenance All permeable pavements, including Pervious Concrete, are filters Filters remove particles Related to size of hole in filter, size of filtered particle, amount of particles, velocity of fluid 1/20/2011:24

25 Operation and Maintenance City of Olympia, WA 1/20/2011:25

26 Operation and Maintenance 1/20/2011:26 City of Olympia, WA

27 Maintenance Cycles Permeability (in./hr) 1/20/2011:27 Ferguson 2005

28 Pervious Concrete Applications Parking Areas Driveways Sidewalks Roadways Overlays Swales & Ditches Erosion Control Slope Protection Load-bearing Walls

29 Pervious Concrete City Sidewalk Year: 2000 Owner: City of Olympia, WA 1500 lineal feet of sidewalk Sub-grade: native soil was permeable enough Savings: $110,000 - land acquisition for detention ponds unnecessary

30 University of Tennessee-Chattanooga Finley Stadium Water collected and used for stadium irrigation

31 Legacy Trail, Lexington, KY 1/20/2011:31

32 Pervious Concrete Storage Lot Shelter Systems, Ltd. (Westminster, MD) Placed 2004 Wet Freeze (90 cycles/yr) 8 ac. of pavement saved $400,000 in underground drainage and eliminated 1.5 ac. detention pond heavily loaded trucks per day Flows 80 inches/hour

33 Stained pervious at Edgewater Park, Minneapolis

34 1/20/2011:34 Overlay, Albertville, MN

35 Ft. Riley playground 1/20/2011:35

36 1/20/2011:36 Seatac, WA

37 Stamped and stained *Not a recommended location

38 Retaining Wall Weap block

39 Pervious Stormwater Summary Permeable pavements are both BMPs, maintenance will be required (same as any other BMP or pavement) The amount of maintenance will be site specific, but generally low if protected initially Use good design, guidance, specifications, and an experienced contractor Cure it Success! 1/20/2011:39

40 Questions Contact Information: John T. Kevern, Ph.D., E.I.T., LEEP AP Assistant Professor of Civil Engineering 370H Flarsheim Hall, 5100 Rockhill Rd. University of Missouri Kansas City Kansas City, MO Phone: Fax: