Concrete Solutions to Storm Water Runoff

Transcription

1 Concrete Solutions to Storm Water Runoff A. Vance Pool Senior National Resource Director National Ready Mixed Concrete Association (NRMCA) EPA MS4 Conference 2012, Ft. Worth, TX

2 Announcement 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.

3 Disclaimer The information provided by NRMCA is provided in good faith and represents the information available at the time of the presentation. Practices, products and methods discussed herein are representative of general construction knowledge. Since each and every construction project, site, codes and applicable local laws vary, it is the responsibility of the user of this knowledge to engage licensed engineers and or architects to confirm their applicability to specific projects. Copyright 2012 National Ready Mixed Concrete Association, all rights reserved. Any and all Trademarks, Sales marks or brands depicted herein are the property of their respective owners and all rights are reserved.

4 Before we talk about pervious concrete Don t forget that traditional concrete streets, roads and parking lots are now competitive on first cost with asphalt Concrete pavements have shown themselves to cost ½ as much to own over their life cycle than asphalt based on real world data Concrete is more sustainable than asphalt Carbon footprint Better mileage Not composed of hydrocarbons

5 Building Materials PPI Report May 2012

6 Introduction Length of Presentation: 1 Hour Architects Earn 1 LU Engineers Earn 1 PDH NRMCA is an AIA/CES Registered Provider Records kept on file with NRMCA and AIA/CES

7 Today s Outline Intended to be an overview Pervious Concrete, what is it? Applications Benefits Engineering Properties Construction Inspection & Maintenance

8 What is Pervious Concrete? AKA Porous Concrete Permeable Concrete Gap-Graded Concrete No-Fines Concrete Enhanced-Porosity Concrete Open cell structure allows to pass through Appearance of a Rice treat water Krispies

9 The concrete that looks like Rice Krispies Treats Rice Krispies, Snap, Krackle and Pop are registered trademarks of the Kellogg Corporation. All rights reserved.

10 Applications First used in 1852 in residential walls in Europe when sand & other fine aggregates were not readily available Primary use as a pavement Parking areas Sidewalks & pathways Tennis courts Patios Residential roads, alleys, and driveways

11 Pervious Concrete PARKING LOTS

12 Home Depot Brandon, FL 14 Years Old

13 Finley Stadium Chattanooga, TN

14 Finley Stadium

15 PetSmart Brandon, FL 14 Years Old (1990)

16 Brandon Regional Hospital Brandon, FL 16 Years Old (1988)

17 Olympia, WA sidewalk

18 Webb Bridge Park Alpharetta, GA 10 years old (1994)

19 Pervious Concrete Driveway at Alden Lane in Walnut Creek 2002

20 Bannister Park Fair Oaks, CA 2001

21 Phoenix Park Pervious Concrete Parking Lot 2002

22 Other Applications Slope stabilization Tree grates in sidewalks Swimming pool decks Pavement edge drains Noise barriers Subbase for conventional concrete pavement

23 Route 23 Sussex, NJ Slope Erosion Before

24 Route 23 Sussex, NJ Slope Erosion After

25 Florida Aquarium Tampa, FL 10 Years Old (1994)

26 Pervious Concrete street Portland, Oregon

27 Miller Park (Fair Oaks) Pervious Concrete Parking Lot 2002 Miller Park is at 8480 Sunset Avenue in Fair Oaks

28 Conventional vs Pervious Conventional Pavement (Left) (Same Site) Pervious Concrete (Right)

29 Denver, CO After Major Snowfall Sites Directly Across The Street Photos Less Than 5 mins. Apart Pervious Concrete (Left) Conventional (Right)

30 Benefits Environmental Benefits Cost Advantages

31 Environmental Benefits Reduces stormwater runoff Replenishes water tables & aquifers Minimizes flash flooding & standing water Prevents warm & polluted water from entering our streams Mitigates surface pollutants Reduces heat island effect Is an EPA best management practice

32 Mitigates surface pollutants Not an oil-based pavement material Reduce first flush pollutants Oil Anti-freeze Other automobile fluids Treats pollutants naturally Contaminated water percolates into the ground Soil chemistry & biology treat water naturally Large spills contained & handled easily

33 Pervious Concrete Keeps Billy Healthy

34 Reduces heat island effect Light colored concrete absorbs less heat Dark pavement & roof surfaces can increase urban temperatures by 2-12 degrees as compared to the surrounding countryside

35 An EPA BMP For stormwater pollution prevention Lower heat island effect Pervious concrete is eligible for one LEED credit point for the USGBC Green Building Rating System. Other credits can be earned by using concrete. Reduces runoff

36 Cost Advantages Zoning ordinances on impervious surfaces Stormwater utility fees Eliminates need for detention ponds & other costly stormwater management practices Provides for more efficient use of land development Lower cooling costs Reflectivity & Safety

37 Composite Designs Mt. Angel Easy Storage - Oregon

38 Reflectivity = Safety Same mall one side concrete and one side asphalt same amount of lighting on each side! Concrete Can reduce lighting costs by 30% Asphalt

39 Engineering Properties Fresh pervious concrete properties Hardened properties Durability Mix design for pervious concrete Pavement Design

40 Fresh Properties Low slump about ½ to 2 New admixtures can get slump! For QC, density is the preferred measurement (100 to 125 pcf) Placement and haul times reduced as a result of increased surface area in mix design leading to increased evaporation rates (usually 1 hr. between mixing & placing) Mandatory mixing requirements for optimum consistency Admixtures can help

41 Hardened Properties Typical compressive strength of 2500 psi 15% to 25% void structure facilitates permeability Allows 3-8 Gallons of water transfer per square foot = 340 of rain per hour 5 section with 20% voids holds 1 of rain water Base design important to storage as well Roughly ½ the shrinkage of normal concrete

42 Durability Freeze-thaw resistance Importance of drainable base material Air entrainment for paste Sulfate resistance Abrasion resistance

43 Pervious Concrete Can Be Painted

44 Colored Pervious Concrete

45 Pavement Design Thickness Hydrological Design Considerations of pavement & related base materials (stormwater storage capacity) Mechanical Properties (load carrying capacity) Choose greater thickness of these needs Design software is currently being developed

46 Construction Placement & consolidation Finishing Joint placement Curing and protection Opening to traffic

47 Install Filter Fabric

48 Roller Screed

49 Asphalt Paver for Placement Finley Stadium Univ. of Tennessee, Chatanooga

50 Laser Screed Installation

51 Finishing

52 JOINTS Joints are typically placed every 20 Pervious concrete parking areas are sometimes placed with no joints. No joint sealant needed Joint

53 Jointing Pizza Cutter

54 No Joints

55 CURING Curing pervious concrete is critical due to the porosity and low water-cement ratio.

56 Once the crews got familiar with pervious, it required less time and labor than conventional concrete.

57 Opening to Traffic After 7 days Depending on weather conditions

58 Alternative Drainage Frequently Used for Poor Percolating Soils

59 Maintenance Majority of pervious concrete needs little or no maintenance Handled in original design Prevent flow of debris onto pavement surface Clogged pervious concrete Vacuuming surface Pressure washing Restores 80% to 90% of permeability

60 Questions & Answers

61 Thank You A. Vance Pool, Senior Director, National Resources For more information visit