In this presentation you will get to learn about the pervious concrete - What is pervious concrete History Need of pervious concrete Mix design Applications Advantages Disadvantages

1. A PROJECT REPORT
ON

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TopicsToBe Discussed
• What is perviousconcrete
• History
• Need of pervious concrete
• Mix design
• Applications
• Advantages
• Disadvantages
• Conclusion
• Reference

4. What is pervious concrete ?
• Pervious concrete is a special type of concrete,
which consists of cement, coarse aggregates,
water and if required, admixtures and other
cementitious materials.
• It is a concrete with high porosity used
for concrete flatwork applications.
• It allows water from precipitation and
other resources to pass through it.
• It is also known as Permeable concrete
and Porous concrete.

5. History Of PerviousConcrete
• Pervious concrete was first used in the 1800s in Europe.
• It was brought to the United States after World War II.
• It first showed up in Florida and other southern coastal
states.
• It became increasingly viable in Europe after the Second World
War due to the Scarcity of cement.
• The coastal states have experienced pervious concrete for over
20 years.
• In the 1990’s the U.S. Environmental Protection Administration
(EPA) came out with the Clean Water Act (CWA), that later led
to other phases of implementation of the pervious concrete to
preserve the waterways from stormwater borne pollutants.

6. Need of pervious concrete
• A large amount of rain water ends up falling
on impervious surfaces such as parking lots, drive
ways, sidewalks, and streets rather than soaking
into the soil.
• This creates an Imbalance to the natural
ecosystem and leads to a host of problems
including erosion, floods, ground water level
depletion and pollution of rivers, lakes etc..

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8. MIX DESIGN
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• Aggregates
• Cementious Materials
• Water
• Admixtures
Ranges Of Materials
•DesignVoidContent:15%to 30%
• Waterto CementRatio:0.28to0.40
•Binder to AggregateRatio:below0.25

9. Aggregates
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• Pervious concrete has little or no fine aggregates in the
mixture. Aggregate size is typically between 3/8 to1/2
inch maximum

10. Cementious materials
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• Typically type-I cement is used for the production of pervious concrete.
• Supplementary cementious materials such as fly ash or slag can be used in
exchange up to about 25% (fly ash) and up to about 50%(slag) ofcement.

11. Water
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• Water meeting standard requirements for conventional
concrete can be used for the production of pervious concrete

12. Admixtures
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to improve the
• Air entraining admixtures may be used
freeze/thaw durability of the paste/mortar.

13.  A mix design with little water can create a very
weak binder. This will create a very dry mix that is
susceptible to spalling and crumbling.
 Correct amount of water
 A mix design with too much water can collapse
the void space, making an almost impenetrable
concrete surface
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14. Ranges of materials proportions in pervious concrete
• Cementitious materials
• Aggregate
• Water cement ratio
(by mass)
• Aggregate cement ratio
(by mass)
• Fine:coarse aggregate ratio
(by mass)
MATERIAL PROPORTIONS
270 to 415 kg/m3
1190 to 1480 kg/m3
0.27 to 0.34
4 to 4.5:1
0 or 1:1

15. APPLICATIONS
• Residential roads , alleys and driveways
• Low volume pavements.
• Sidewalks and pavements.
• Parking areas
• Tennis courts
• Sub base for conventional concrete pavements
• Well linings
• Swimmimg pool decks
• Noise barriers

16. APPLICATIONS
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17. ADVANTAGES
• It recharges ground water directly.
• It Protects streams, watersheds, and ecosystems.
• It Reduces surface temperatures and heat island effects.
• It Eliminates need of expensive collection and detention
systems.
• It is much more profitable for the developer.
• It Eliminates costly storm water detention vaults and piping
systems.
• It Eliminates the cost of curb and gutter installations.

18. DISADVANTAGES
• Extended curing time.
• It is more expensive to install as compared to traditional
pavements.
• Limited use in heavy vehicle traffic areas.
• Frequent maintenance is required because it is prone to
clogging.
• Compressive strength is low.
• They aren’t as strong as traditional pavements.
• If we put consistent pressure (like heavy vehicle braking) on it,
then the pores of the pavement will collapse. Due to this,
permeable.
• It is not ideal for building , airport runways and highways.
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19. WAYS OF IMPROVEMENT OF STRENGTH OF PERVIOUS CONCRETE:
The strength improvement can be done by –
• Addition of small quantity of fine aggregates.
• Addition of small quantities of cementitious
materials.
• Usage of small sized coarse aggregates.
• Using low w/c ratio.

20. CONCLUSION
Now we have come to the conclusion-
• In the past due to the scarcity of cement, the pervious
concrete has been used extensively.
• The pervious concrete has lost its importance after
successful production of cement in large quantities.
• But now-a-days, the usage pervious concrete has gained its
popularity due to many advantages.
• The urban areas all over the world have become
CONCRETE JUNGLES. The discharge of storm water is very
difficult problem in the present conditions.
• By using the pervious concrete we can able to recharge the
ground water table and the storm water disposal can also
be done.
• So, in future it can tackle the aforesaid problems.

21. REFERENCE
• NRMCA, “What, Why, and How? Pervious Concrete,
“Concrete in practice series, CIP 38, Silver Spring, Maryland,
May 2004, 2pp.
• Pervious concrete pavements, southeast
Association, www.pervious.info
• NRMCA, “Freeze Thaw Resistance of Pervious
Concrete,” National Ready Mixed Concrete Association,
May 2004.
• RMC Research Foundation Pervious Concrete
Research Compilation: Past, Present and Future.
• CONCRETE TECHNOLOGY TODAY, Portland Cement
Association.

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