Pervious concrete is a special type of concrete that allows water to pass through it, reducing runoff from sites. It consists of cement, coarse aggregates, and 15-35% voids. Pervious concrete requires careful construction to place and cure it properly given its high porosity. It has applications in driveways, sidewalks, and low-traffic roads due to advantages like reducing flooding and replenishing groundwater. Some disadvantages include needing maintenance and having lower compressive strength than regular concrete. Overall, pervious concrete can help address issues like water scarcity in urbanizing areas.

1. Seminar PresentationSeminar Presentation
onon
PERVIOUS CONCRETEPERVIOUS CONCRETE
Seminar Guide:-Seminar Guide:- Presented by:-Presented by:-
Dr. V. Sarath BabuDr. V. Sarath Babu Deepak Tiwari 141539Deepak Tiwari 141539
Devagya P. Singh 141540Devagya P. Singh 141540
Dharamveer Singh 141543Dharamveer Singh 141543

2. Topic to be DiscussedTopic to be Discussed
IntroductionIntroduction
Need of Pervious ConcreteNeed of Pervious Concrete
ComparisonComparison
MaterialMaterial
ConstructionConstruction
ApplicationApplication
AdvantagesAdvantages
DisadvantagesDisadvantages

3. INTRODUCTION
 Pervious concretePervious concrete is a special type of concrete with a highis a special type of concrete with a high
porosity used for concrete flatwork applications.porosity used for concrete flatwork applications.
 It allows water from precipitation and other sources to passIt allows water from precipitation and other sources to pass
directly through, thereby reducing the runoff from a site anddirectly through, thereby reducing the runoff from a site and
allowing groundwater recharge.allowing groundwater recharge.

4.  It is also known as gap graded concreteIt is also known as gap graded concrete or permeable
concrete.
 Pervious concrete has little or no fine aggregate.Pervious concrete has little or no fine aggregate.

5. It consists of 15 to 35% voids, allowing for quick drainage.
The infiltration rate of pervious concrete will fall into the range of
80 to 720 liters per minute per square meter.

7. NEED OF PERVIOUS CONCRETENEED OF PERVIOUS CONCRETE
 A large amount of rain water ends up falling onA large amount of rain water ends up falling on
impervious surfaces such as parking lots, drive ways,impervious surfaces such as parking lots, drive ways,
sidewalks, ad streets rather than soaking into the soil.sidewalks, ad streets rather than soaking into the soil.
 This creates an imbalance to the natural ecosystem andThis creates an imbalance to the natural ecosystem and
leads to a host of problems including erosion, floods,leads to a host of problems including erosion, floods,
ground water level depletion and pollution of rivers, lakesground water level depletion and pollution of rivers, lakes
etc..etc..

8. 
InsteadInstead of constructing them with conventional concrete orof constructing them with conventional concrete or
asphalt, we should be switching to pervious concrete orasphalt, we should be switching to pervious concrete or
porous pavement.porous pavement.

9.  Pervious concrete also naturally filters water from rainfallPervious concrete also naturally filters water from rainfall
or storm and can reduce pollutant loads entering intoor storm and can reduce pollutant loads entering into
streams, ponds and rivers.so in this way it helps instreams, ponds and rivers.so in this way it helps in
ground water rechargeground water recharge

10. COMPARISON OF PERVIOUS ANDCOMPARISON OF PERVIOUS AND
IMPERVIOUS CONCRETEIMPERVIOUS CONCRETE
PERVIOUS CONCRETEPERVIOUS CONCRETE
IMPERVIOUSIMPERVIOUS
CONCRETECONCRETE

11. FLEXIBLE PAVEMENT VSFLEXIBLE PAVEMENT VS
PERVIOUS PAVEMENTPERVIOUS PAVEMENT

12. Flexible PavementFlexible Pavement
 Deformation in the subgrade is transferred to the upperDeformation in the subgrade is transferred to the upper
layerslayers
 Design is based on the load distributing characteristics ofDesign is based on the load distributing characteristics of
the component layersthe component layers
 Have low flexural strengthHave low flexural strength
 Load is transferred by grain to grain contactLoad is transferred by grain to grain contact
 Have low completion cost but repair cost is highHave low completion cost but repair cost is high
 Have low life span (high maintenance cost)Have low life span (high maintenance cost)
 Strength of the road is highly dependent on the strengthStrength of the road is highly dependent on the strength
of the subgradeof the subgrade
 Rolling of the surfacing neededRolling of the surfacing needed
 Road can be used for traffic with in 24hrsRoad can be used for traffic with in 24hrs

13. Pervious PavementPervious Pavement
 •• Deformation in the subgrade is not transferred toDeformation in the subgrade is not transferred to
subsequent layerssubsequent layers
 Design is based on flexural strength or slab actionDesign is based on flexural strength or slab action
 Have high flexural strengthHave high flexural strength
 So such phenomenon of grain to grain load transfer existSo such phenomenon of grain to grain load transfer exist
 Have low repair cost but completion cost is highHave low repair cost but completion cost is high
 Life span is more when compared to the flexibleLife span is more when compared to the flexible
pavements (low maintenance cost)pavements (low maintenance cost)
 Surfacing can be directly laid on the subgradeSurfacing can be directly laid on the subgrade
 Road cannot be used until 14 days of curingRoad cannot be used until 14 days of curing
 Force of friction is highForce of friction is high
 No damage by oils and greasesNo damage by oils and greases

14. MATERIALSMATERIALS
 Pervious concrete mainly consists of:Pervious concrete mainly consists of:
 Ordinary Portland cementOrdinary Portland cement
 Coarse aggregate (19mm – 9.5mm)Coarse aggregate (19mm – 9.5mm)
 Water (Free from salts and impurities)Water (Free from salts and impurities)
 In normal concrete the fine aggregates typically fills the voidsIn normal concrete the fine aggregates typically fills the voids
between the coarse aggregates.between the coarse aggregates.
 In pervious concrete fine aggregate is non-existent or presentIn pervious concrete fine aggregate is non-existent or present
in very small amounts (<10% by total weight of aggregates).in very small amounts (<10% by total weight of aggregates).

15. Ranges of Materials Proportions in PerviousRanges of Materials Proportions in Pervious
ConcreteConcrete..
MATERIALMATERIAL PROPORTIONSPROPORTIONS
Cementitious materialsCementitious materials 270 to 415270 to 415 Kg/m3Kg/m3
AggregateAggregate 1190 to 14801190 to 1480 Kg/m3Kg/m3
Water: Cement ratioWater: Cement ratio
(by mass)(by mass)
0.27 to 0.340.27 to 0.34
Aggregate: cement ratioAggregate: cement ratio
(by mass)(by mass)
4 to 4.5:14 to 4.5:1
Fine: coarse aggregateFine: coarse aggregate
ratioratio
(by mass)(by mass)
0 to 1:10 to 1:1

16. CONSTRUCTION

17. Subgrade and Sub-baseSubgrade and Sub-base
PreparationPreparation
 Uniformity of subgradeUniformity of subgrade
support is a key criterion forsupport is a key criterion for
placing pervious pavement.placing pervious pavement.
 Increasing the subgradeIncreasing the subgrade
density decreases itsdensity decreases its
permeabilitypermeability
 Pervious pavements containPervious pavements contain
minimal water and highminimal water and high
porosityporosity
 Care must be taken to ensureCare must be taken to ensure
that the pavement does notthat the pavement does not
dry out prematurely.dry out prematurely.

18. Batching and MixingBatching and Mixing
 The special properties of pervious concrete requireThe special properties of pervious concrete require
tighter control of mixture proportioningtighter control of mixture proportioning
 the water content of pervious concrete is limited to athe water content of pervious concrete is limited to a
narrow range to provide adequate strength andnarrow range to provide adequate strength and
permeabilitypermeability
 Aggregate moisture level should be monitored carefullyAggregate moisture level should be monitored carefully
 The correct water content will provide a mix with a sheenThe correct water content will provide a mix with a sheen

19. TransportationTransportation
 As pervious concrete has a low water content, specialAs pervious concrete has a low water content, special
attention is required during transportation andattention is required during transportation and
placement.placement.
 A pervious pavement mixture should be dischargedA pervious pavement mixture should be discharged
completely within one hour after initial mixingcompletely within one hour after initial mixing
 Its very low slump may make discharge from transitIts very low slump may make discharge from transit
mixers slower than for conventional concretemixers slower than for conventional concrete

20. Placement and ConsolidationPlacement and Consolidation
 A variety of placement techniques can be used forA variety of placement techniques can be used for
constructing pervious concrete pavements.constructing pervious concrete pavements.
 It should be noted that pervious concrete mixturesIt should be noted that pervious concrete mixtures
cannot be pumped.cannot be pumped.

21.  It should be noted that pervious concrete mixturesIt should be noted that pervious concrete mixtures
cannot be pumped.cannot be pumped.

22.  Placement should be continuous, and spreading andPlacement should be continuous, and spreading and
strikeoff should be rapidstrikeoff should be rapid
 Conventional formwork is usedConventional formwork is used

23. FinishingFinishing
 pervious concrete pavements are not finished in thepervious concrete pavements are not finished in the
same way as conventional concrete pavements.same way as conventional concrete pavements.

24.  Normal floating and troweling operations tend to close upNormal floating and troweling operations tend to close up
the top surface of the voids, which defeats the purposethe top surface of the voids, which defeats the purpose
of pervious concrete.of pervious concrete.

25. Curing and ProtectionCuring and Protection
 The open structure and relatively rough surface ofThe open structure and relatively rough surface of
pervious concrete exposes more surface area of thepervious concrete exposes more surface area of the
cement paste to evaporation, making curing even morecement paste to evaporation, making curing even more
essential than in conventional concreting.essential than in conventional concreting.

26.  Water is needed for the chemical reactions of theWater is needed for the chemical reactions of the
cement.cement.
 It is critical for pervious concrete to be cured promptly.It is critical for pervious concrete to be cured promptly.

27. APPLICATIONS:APPLICATIONS:
The various applications of pervious concrete are as follows:The various applications of pervious concrete are as follows:
 Residential roads, alleys, and drivewaysResidential roads, alleys, and driveways
 Low-volume pavementsLow-volume pavements
 Sidewalks and pathwaysSidewalks and pathways
 Parking areasParking areas
 Tennis courtsTennis courts
 Sub base for conventional concrete pavementsSub base for conventional concrete pavements
 Well liningsWell linings
 Swimming pool decksSwimming pool decks
 Noise barriers.Noise barriers.

28. PERVIOUS CONCRETE RESIDENTIAL STREET SHOWING
WATER INFILTRATION

29. Walkway in Beijing, China built for 2008 Olympics

30. Residential RoadsResidential Roads

31. ADVANTAGES :
 Reduces runoff from site.Reduces runoff from site.
 Helps in unchanging ground water.Helps in unchanging ground water.
 Eliminates need for retention ponds & other costly stormEliminates need for retention ponds & other costly storm
water management practices.water management practices.
 Provides for more efficient use of land development.Provides for more efficient use of land development.
 Water resources are conservedWater resources are conserved
 Adjacent trees and vegetation are allowed moreAdjacent trees and vegetation are allowed more
rainwater.rainwater.
 The permeability of pervious concrete providesThe permeability of pervious concrete provides
increased safety for drivers.increased safety for drivers.

34. DisadvantagesDisadvantages
 Difficult in providing the reinforcementDifficult in providing the reinforcement
 Frequent maintenance is requiredFrequent maintenance is required
 Compressive strength is comparatively lessCompressive strength is comparatively less
 Require more time and experimental works for theRequire more time and experimental works for the
constructionconstruction
 It cant be used for the construction of bridges, buildings,It cant be used for the construction of bridges, buildings,
dams and so on….dams and so on….

36. Pervious concrete in IndiaPervious concrete in India
 Pervious concrete can be successfully used in India inPervious concrete can be successfully used in India in
applications such as parking lots, driveways,applications such as parking lots, driveways,
gullies/sidewalks, road platforms, etc.gullies/sidewalks, road platforms, etc.
 Massive urban migration in Indian cities is causing theMassive urban migration in Indian cities is causing the
ground water to go much deeper and is causing waterground water to go much deeper and is causing water
shortages.shortages.
 In future with increased urbanization, diminishing groundIn future with increased urbanization, diminishing ground
water levels and focus on sustainability, technologies suchwater levels and focus on sustainability, technologies such
as pervious concrete are likely to become even moreas pervious concrete are likely to become even more
popular in India as well as other countries.popular in India as well as other countries.

37. ConclusionConclusion
 Saving in materials:-Saving in materials:- AsAs no-fines concreteno-fines concrete
contains no sand and consequently requirescontains no sand and consequently requires
considerably less cement per cubic yard of concrete,considerably less cement per cubic yard of concrete,
there is a direct saving in materials.there is a direct saving in materials.
 High thermal insulation value:High thermal insulation value:-Because of its nature,-Because of its nature,
which allows the formation of large voids, it has betterwhich allows the formation of large voids, it has better
insulating characteristics than conventional concrete.insulating characteristics than conventional concrete.
 Environmental Benefits:-Environmental Benefits:- Reduces storm waterReduces storm water
runoffrunoff

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

39. THANK YOU..!THANK YOU..!