maintenance guidelines for pervious concrete · importance of cleaning • pervious concrete...

Presented By:National Ready Mixed Concrete Association

Maintenance Guidelines for Pervious Concrete

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National Ready Mixed Concrete Association

• National Trade Association – Established in 1930• HQ in Alexandria, VA• 1,400+ Member Companies• NRMCA Represents ~75% of North American Ready Mixed Production• Mission - Serve Industry and Partners Through:

• Compliance and Operations• Engineering• Government Affairs• Local Paving: Pave Ahead™ Initiative

• Structures and Sustainability: Build With Strength™ Initiative

Interested in becoming a member?Visit: www.nrmca.org/membership/

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Thank you to the NRMCA 2020 Super Sponsors

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NRMCA Disclaimer• This presentation has been prepared solely for information purposes. It is intended

solely for the use of professional personnel, competent to evaluate the significance and limitations of its content, and who will accept full responsibility for the application of the material it contains. The National Ready Mixed Concrete Association and any other organizations cooperating in the preparation of this presentation strive for accuracy but disclaim any and all responsibility for application of the stated principles or for the accuracy of the content or sources and shall not be liable for any loss or damage arising from reliance on or use of any content or principles contained in this presentation.

• Unless otherwise indicated, all materials in this presentation are copyrighted to the National Ready Mixed Concrete Association. All rights reserved. Therefore reproduction, modification or retransmission in any form is strictly prohibited without the prior written permission of the National Ready Mixed Concrete Association.

• ©2020 National Ready Mixed Concrete Association.

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Instructions

• Webinar is being recorded and posted at paveahead.com/education/.

• Everyone is muted.

• Type questions in the question box.

• Download the handouts in the GoToWebinar control panel.

• Credit for course:– Based on attendance.

– Survey (Quiz) – In follow-up e-mail, not required, but encouraged.

– Attendance Certificate – In follow-up e-mail 1 hour after webinar.

– AIA members – Attendance registered with AIA-CES if AIA number provided.

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About the Course

Learning Units (LU) or Professional Development Hours (PDH)

• AIA-CES PCM101: 1.0 LU/Elective (1.0 Hour) or 1.0 PDH for Engineers

• Learning Objectives:

– Identifying the maintenance requirements of pervious concrete pavement

– Familiarity with appropriate ASTM test procedures for evaluating pervious concrete performance

– Understanding proper maintenance procedures and record keeping

– Special considerations for winter maintenance in cold climates

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Today’s Presenter

• Phil Kresge–Senior Vice President – East Central–Ready Mix Producer–PA Concrete Promotion Council – Exec. Director–NRMCA since 2004

More information at paveahead.com/experts/

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Pervious Concrete Pavement

• Surface layer of stormwater management system

• Vital part of water infiltration system

• Like any filter, must be cleaned periodically

9 *Illustration courtesy Pennsylvania Aggregates and Concrete Association

10 *Illustration courtesy Pennsylvania Aggregates and Concrete Association

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For Example: 100,000 ft2 parking lot•6” Pervious Concrete•12” Aggregate Detention Layer

•$355,000 Installed

•4” Asphalt Pavement•8” Aggregate Base

•$285,000 Installed

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For Example: 100,000 ft2 parking lot•6” Pervious Concrete•12” Aggregate Detention Layer

•$355,000 Installed

•4” Asphalt Pavement•8” Aggregate Base

•$285,000 Installed

•Inlets = $25,000•18” Pipe = $85,000•1 acre detention pond

$135,000

•Total Actual Cost$530,000

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Cost Comparison

*courtesy Pennsylvania Aggregates and Concrete Association

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The Common Misconception…

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The Reality…

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Importance of Cleaning

Maintenance different than other pavements.

• Owner’s responsibility.

• Keep permeability close to design.

• Ensures longevity of system.

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Importance of Cleaning

• Pervious concrete pavement can still function with no cleaning

• Will work better if sand, dirt, leaves and other debris are removed

•Before Cleaning

•After Cleaning

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Frequency of Cleaning

• Depends on amount of sediment

• Inspect pavement regularly

• Observe drainage during a storm event

• Trash, leaves or paper, may degrade into small particles and migrate into the voids

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Three Levels of Maintenance

• Routine Maintenance

• Periodic Maintenance

• Deep Cleaning/Unclogging

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Routine Maintenance

• Visual Inspection

• Leaf blowing or vacuuming

• Can reduce infiltration of materials into pavement

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Periodic Maintenance

• Water flushing removes debris

• Dislodged sediment vacuumed

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Deep Cleaning/Unclogging

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Deep Cleaning/Unclogging

• Regenerative Vacuum Sweeper

• Pressure Wash/Vacuum

• Stop cleaning if damage to surface is observed

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Moss Control

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Moss Control

• Add 10 to 30 oz of baking soda to five gallons of warm water (64F or higher). Spray on surface at 100 to 120 sf per gallon.

• Mix 5 pounds of hydrated lime with five gallons of water. Spray onto surface.

• Mix solution of 10 to 20 percent household bleach and water and spray on surface.

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Please note…

• Sweeping pervious may be ineffective

• Small sediment gets trapped in coarse surface

• Do not sweep or flush from impervious areas onto pervious areas

• Use cleaning chemicals with EXTREME caution.

• Periodically check permeability

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Testing Permeability

Simple evaluations

Pouring water on the pavement surface

Visual observation during a rain storm

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ASTM C1701- Standard Test Method for Infiltration Rate of In-Place Pervious Concrete

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Testing Permeability

• Perform ASTM C1701 once curing is completed

• Establish baseline/benchmark

• Map/diagram test locations

• Future tests should be evaluated based on initial test results

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Freeze-Thaw Resistance

• Depends on saturation level

• Avoid critical saturation– Design

• Infiltration System • Secret of success is to provide the water a place to go

– Maintenance• Cleaning, as needed, in severe climates

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Clean is Key to F/T Durability

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Winter Maintenance

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Snow Removal

• Snow blowers

• Snow plows– Use plastic or rubber edge on plow blade

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Snow Removal

• Brooms not recommended

–Can cause snowpack

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Do NOT use pervious concrete as storage area for snow!

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Deicing Chemicals

Use sparingly

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Deicing Chemicals

Never on concrete less than one year old

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Deicing Chemicals

• Sodium chloride or calcium chloride on mature concrete

• Never ammonium sulfate or ammonium nitrate

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Deicing Chemicals

• Calcium Chloride impregnated sand after first year

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Deicing Chemicals

• Magnesium Chloride• Calcium Magnesium Acetate• Potassium Acetate

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Deicing Chemicals

• Magnesium Chloride• Calcium Magnesium Acetate• Potassium Acetate

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Coarse Sand

• Larger than a No. 8 sieve

• Broadcast on pervious pavement

• Thoroughly clean surface by vacuuming after winter season

• Maintain the system permeability

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Maintenance of Surrounding Areas

• Sediment can be carried by wind• Automobiles carry sediments

onto parking area• Landscape maintenance

practices• Design proper grading, water

flow, vegetation and curbs to reduce potential clogging

• Landscaping material should not be stored on pavement

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Maintenance of Surrounding Areas

• Should drain away from pervious pavement

• Otherwise materials may flow onto pavement resulting in:

– Reduced pavement porosity

– Increased frequency of maintenance

– Compromised service life

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Maintenance of Surrounding Areas

• Adjacent areas that do drain should be kept maintained

• Grassy areas should be kept seeded

• Informational signage recommended

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“An ounce of prevention is

worth a pound of cure.”

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Develop Maintenance Plan

• Establish baseline infiltration rate

• Identify procedure and frequency

• Transfer with change in ownership

How Can We Assist You for Free?

NRMCA Resources

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www.paveahead.com

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• Guide to Specifying Pervious Concrete

• Importance of Using Certified Pervious Concrete Contractor

• Acceptance Testing of Pervious Concrete

• Guide to Proper Mix Design of Pervious Concrete

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paveahead.com/register/

Pave Ahead™

Concrete Pavement Design Center

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paveahead.com/register/

Pave Ahead™ Design Center• Design and Jointing recommendations and reviews for FREE• Cost comparisons including life cycle costs• Specification review• Ready mixed products:

– Conventional concrete (full depth and overlays)– Pervious concrete– Roller compacted concrete– Cement slurry for full depth reclamation (FDR)

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Local Paving Division: State and Regional Assignments

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Local Paving Division: State and Regional Assignments

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www.paveahead.com/education• More NRMCA Concrete Pavement professional development:

– Designing Concrete Parking Lots and Streets– Designing Concrete Industrial Pavements– Soils 101: What to Know for a Successful Paving Project– Concrete Pavement Jointing and Details– Materials and Construction Specifications for Concrete Pavement Projects– Concrete Street and Parking Lot Maintenance and Repair– Concrete Overlays of Existing Asphalt Surfaced Streets and Parking Lots– Concrete Trail Design– Designing Pervious Concrete– Specifying Pervious Concrete– Installing Pervious Concrete

• NRMCA Concrete Buildings Webinar Series: buildwithstrength.com/education/

Recordings available for these previous webinars!

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www.paveahead.com/education

• Portland Cement Association Webinar Series: www.cement.org/events/pca-infrastructure-webinar-series

– Full-Depth Reclamation with Cement

– Lightweight Cellular Concrete for Geotechnical Applications

– Roller-Compacted Concrete Pavements

– Cement Stabilized Subgrade Soils

– Cement-Based Water Resource Applications

Recordings available for previous webinars!

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www.paveahead.com/education

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