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Essay On Permeable Pavement

1297 Words6 Pages

PERMEABLE PAVEMENT DESIGN AND CONSTRUCTION Palash Pandit
Civil Engineering Dept, OIST, Bhopal.

ABSTRACT
Permeable pavements typically consist of pervious concrete, porous asphalt .Permeable pavements infiltrate stormwater, filter and clean contaminants and promote groundwater recharge. They have gained substantial popularity and have become an integral part of low impact design and best management practices for storm water management. In order to be effective, permeable pavement must be designed to provide sufficient structural capacity to accommodate the vehicle loadings, manage stormwater flowing into the surface and soil subgrade, as well water draining out of the base/ subbase.

1.INTRODUCTION
Permeable pavement is a method of paving …show more content…

Located below the layer of porous asphalt is a 1-inch thick layer of course and 3 to 3.5 feet of uniformly-graded, clean crushed rock. The crushed rock has approximately 40% void space to receive, temporarily store, and infiltrate the incoming rainfall and any sheet flow from the adjacent landscaped areas. The crushed rock storage reservoir is separated from the underlying subsurface materials by a layer of geotextile filter fabric. The purpose of this fabric is to prevent the movement of fine soil particles into the overlying reservoir, which could impede the infiltration of surface water into the storage bed.

5. INSTALLATION DETAILS
The porous asphalt is installed over a 1” layer of chocker course and bed of uniformly graded, clean washed crushed rock that is usually 18-36” deep. A layer of geotextile fabric separates the crushed rock from the underlying soil to prevent any fines from moving up into the storage bed. The bottom of the recharge bed is excavated to a level surface and is not compacted to allow the water to distribute and infiltrate evenly over the entire bottom bed area.

STEP-1
Leveling of road sub base

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