Pervious concrete is an eco-friendly mixture allowing significant water drainage, typically used in pavements like parking lots and sidewalks in California and Washington. It requires a specific installation process with careful curing due to its low water content, providing economic and environmental advantages despite higher initial costs. Limitations include a rough surface unsuitable for heavy traffic roads, indicating a need for further research to enhance usability.

1. Pervious concrete
 Pervious concrete is a mixture of coarse
aggregate, Portland cement, water and little to no
sand.
 A typical pervious concrete pavement has a 15-
25% void structure and allows 125 to 325 litres
of water per minute to pass through each square
metre.
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2. Pervious concrete for road pavements
 Pervious Concrete can be successfully used for
pavements and is environmentally friendly paving
material that offers the durability of standard
concrete while retaining storm water runoff and
replenishing local watershed systems
 By using pervious concrete drainage of run off
water at parking lots, sidewalks, streets,
driveways, etc. can be done.
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3. Where it is used?
 pervious concrete is helping communities in
California and Washington restore groundwater
supplies and reduce pollution of coastal waters,
which can endanger fragile aquatic ecosystems
and even swimmers.
 In California, pervious concrete is primarily being
used to pave parking lots. But its also becoming a
practical alternative for subdivision streets,
sidewalks, and golf cart paths.
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4. Installation process of Pervious
Concrete
 Pervious concrete is delivered to the
jobsite by conventional ready-mix
trucks.
 Because pervious concrete is thicker in
consistency than regular concrete, a
vibrating mechanical screed is used to
level it off. Vibration is followed by
compaction with a heavy steel roller to
attain greater strength.
 Because pervious concrete has a low
water content, curing is especially
critical. After placement, the concrete
is mixed with water and then covered
with plastic sheeting and kept damp for
at least 7 days to allow full hydration of
the cement.
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5. Benefits of Pervious Concrete
 Economic Benefits
 Environmental Benefits
 Other Benefits
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6. Economic Benefits
 initial costs for pervious concrete pavements
are higher than those for conventional
concrete or asphalt paving. But total costs
can be substantially lower.
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7. Environmental Benefits
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8. Other Benefits
 Lower installation costs
 Permits the use of existing sewer systems
 Increased land utilization
 Lower life-cycle costs
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9. Limitations
 As pervious concrete contain no fine
aggregate its surface is quiet rough and
honeycombed. Hence it seems unsuitable for
roads where traffic is heavy as on highways.
 It can not used for highways, because it has
low strength
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10. Further Scope
 There is much more scope for research
work to impart sufficient smoothness to
pervious concrete pavement surface.
Grinding of surface or providing porous
plaster may be tried.
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