Utilization of Porous Asphalt in Road Construction as

Stormwater ConservationCollege of Technology and Engineering

M.P.U.A.T. (Udaipur)

Guided By: Submitted by:Sh. Trilok Gupta Bhavin SharmaDept. of Civil Engineering B.E. IV Year

(Civil Engineering)

CONTENTS1. Introduction2. Objective3. Design Criteria4. Installation5. Benefits And Uses6. Disadvantages7. Cost and

Maintenances

IntroductionPorous asphalt pavement is commonly known as open graded asphalt concrete (OGAC), open graded friction course (OGFC), and permeable asphalt.

 

CONCEPT: Construct storm water detention basins under the street and parking structures. These basins are designed to collect storm water from structures, pavements and other areas of a development and hold the water until it can percolate into the soil. Porous asphalt pavement is then placed over the top of these basins. These pavements are designed to let the water flow through them and into the detention basin.

ObjectivePorous Asphalt Pavement is to provide the water with a place to go, usually in the form of an underlying, open-graded stone bed. As the water drains through the porous asphalt and into the stone bed, it slowly infiltrates into the soil, Recharge and Replenish Ground Water Level.

DiagramNO ROAD CONSTRUCTED CONDITION

ROAD CONSTRUCTED CONDITION

Design Criteria Soil Permeability is

between 0.25-3.0 Inches per Hour.

Drainage Time 24-48 Hours.

Sub-Drains Used to Minimize Frost Damage

3-5 Feet of Vertical Separation is needed from Seasonal High Groundwater.

Execution Porous Media Beds: Protection of native materials from over compaction is

important. Improper compaction of subbase materials will result in

1) low pavement durability from insufficient compaction, 2) poor infiltration due to over-compaction of subbase.

Grade Control:

Subgrade Preparation:

Porous Media Bed Installation:

POROUS ASPHALT PAVEMENT INSTALLATION

Mixing Plant: Hauling

Equipment: Placing Equipment:

Rollers: Compaction:

Temperature Requirements:

Cont. Spreading and

Finishing: Joints: Striping Paint:

Benefits and Uses

1. Flood Control:2. Water Quality Treatment:3. Recharges Groundwater to Underlying Aquifers: 4. Extended Pavement Life Due to Well Drained Base

and Reduced Freeze-Thaw.5. Allows for Reduction of Storm water Infrastructure

(Piping, Catch- Basins, Retention Ponds, Curbing)

This road is made of porous asphalt.

Disadvantages1. Requires Routine (Quarterly) Vacuum Sweeping

(Vac- Assisted Dry Sweeper Only).

2. Proper Construction Stabilization and Erosion Control are required to prevent Clogging.

3. Quality Control for Material Production and Installation are Essential for Success.

4. Accidental Seal-Coating , Will Cause Failure.

Cost and Maintainance1. Total Project Cost is Comparable for Porous Asphalt with

Reduced Stormwater Infrastructure VS. Standard Pavement Applications where Stormwater Infrastructure Is Required.

2. Materials Cost is 20-25% More Than Traditional Asphalt.

3. Long-term Maintenance is required by Routine Quarterly Vacuum Sweeping.

4. Repairs can be made with Standard Asphalt Not to Exceed 10% of Surface Area.

 

Conclusion1. Longer Life Span Than Ordinary Pavement. 2. Pollutant Removal Efficiency3. Recharge and Replenish Ground Water .4. Promote infiltration.5. Improve water quality.6. Environment Friendly.7. Improve Quality of Water8. Cooler pavement

1.

REFERENCES  Kent Hansen, P.E. National Asphalt Pavement

Association. Asphalt Pavement Association of Oregon,

Salem, OR (APAO.org). Cahill Associates Environmental Consultants. West Chester, PA (Porous@thcahill.com). NAPA / AI Pavement Alliance

(Pavegreen.com). www.californiapavements.org (CalAPA). NAPA IS-131 Publication (NAPA).