Information about Porous asphalt ,Porous concrete ,Porous paverblocks and its construction process.

1. Prepared by -
Shubham
shinde

2.  What are porous pavements?
“These are the pavements that allow the
passage of storm water through surface
course layer.”
They all have a similar structure consisting
underlying reservoir layer but surface
course layer (i.e. concrete, asphalt, PICP)
is depend on purpose.
INTRODUCTION

3. Rainfall and Run-off Rainfall
Ordinary pavements Permeable pavements
 surface deflects
rainwater
 surface absorbs
rainwater
What they actually does ?

4. TYPES OF POROUS PAVEMENTS
 POROUS PAVERBLOCKS
 POROUS CONCRETE
 POROUS ASPHALT

5.  This paverblocks are solid blocks made of
brick, stone, clay or concrete.
 Initially, infiltration is over 50-75in/hr.
Reduce by around 50% in the first 5 years.
 Over a 20-year period, PICP’s(Permeable
Interlocking Concrete Pavements) are
designed to achieve and maintain a
consistent 3 in/hr infiltration rate.
POROUS PAVERBLOCKS

6. POROUS CONCRETE
 In this, stone aggregate is held together
with portland cement and silica sand.
 Aggregates used are Angular, coarse
graded , excluding fines because that
normally fill voids.
 Water cement ratio is between 0.27 to
0.34 .
 Polymers used are acrylic or latex.

7. POROUS ASPHALT
 Porous asphalt consists of fine and course
aggregate stone bound by a bituminous-
based binder.
 The amount of fine aggregate is reduced to
allow for a larger void space of typically 15 to
20 percent.
 Thickness of the asphalt depends on the
traffic load, but usually ranges from 3 – 7 in.
 Porous asphalt has less strength compared
to conventional asphalt .

8. HYDROLOGY
PURPOSE (%
OF TRAFFIC)
• Objectives which influence the decision.

9. CONSTRUCTION PROCESS
Step 1- Excavation.
Protect site area from
excessive heavy
equipment running on
the subgrade.
Excavate the subgrade
soil using equipment
with oversize tires or
tracks to minimize
compaction to soil.

10. Step 2-Placing of
geotextile layer.
These geotextile layer
placed with an overlap
minimum of 16 mm.
Function is to
temporarily protect
stone bed from
sediment
(i.e.seperation
layer)and this layer is
permeable.

11. Step 3-Placing of
uniformly graded
aggregate.
Place the aggregate
stone recharge bed
carefully to avoid
damaging the fabric.
This uniformly graded
stone aggregate of
size 2” with minimum
40% void space .

12. Step 4-Placing of open
graded aggregate or
sweep stones.
After that reservoir bed
is compacted with a
single pass of a light
roller or vibratory plate
compactor.

13. Step 5-Edge
restraints are
provided to restrict
sliding of reservoir
bed when surface
coarse layer is
placing.
And also used to
place surface course
layer in line.

14. Step 6- Placing of
surface coarse layer is
done.
For paverblocks it is
done evenly by making
some gap.
For asphalt and
concrete it is done by
making voids when
designing of mix
proportion.

15. Step 7- These step is
only used for
paverblocks .
After placing paverblocks
sweep / chip stone is
used to fill gaps between
them to restrict entry of
clogging particle.

16. Step 8-Final
compaction is done .
Restrict traffic for at
least 24 hours after
final rolling.

17. C/S VIEW

18. ADVANTAGES
 Reduces storm water runoff.
 Increases ground water table and its quality.
 Reduces installation cost of drainage system.
 Eliminates ponding of water.
 Eco-friendly.
 Initial cost.
 Slope.
 High runoff volumes.
 Pollutant loads.
DISADVANTAGES

19. APPLICATIONS
 Airports.(asphalt pavements used)
 Seashore for erosion protection.
 In slippery areas. e.g. – around
swimming pool.
 Pedestrian walkways.
 Parking lots.
 Low volume roadways.

20.  Porous asphalt pavements provide
excellent parking lots and roads. The
surface wears well. Porous asphalt has
been proven to that, even in extreme
climates, and even in areas with many
freeze-thaw cycles.
 Porous pavement is a sound choice on
economics alone. A porous asphalt
pavement surface costs approximately the
same as conventional asphalt.
 Thererefore they are attractive on both
environmental and economic grounds.
CONCLUSION

21. REFERENCES
Cahill, T. H., Adams, M., & Marm, C. (March–
April 2005). Stormwater Management with
Porous Pavements. Government Engineering.
Retrieved from http://www.smscland.
org/pdf/PorousCahill.pdf.
U.S. Environmental Protection Agency (2008).
Cool Pavements. Reducing Urban Heat
Islands: Compendium of Strategies. Retrieved
from http://www.epa.gov/heatisland/
resources/compendium.html.

22. THANK YOU !