Pervious concrete is a type of high porosity concrete that allows water to pass through it, reducing surface runoff. It consists of cement, coarse aggregate, and water but little to no fine aggregates. This creates 15-25% voids in the concrete, making it lightweight. Pervious concrete can be used in areas with light traffic like parking lots, walkways, and residential streets. It has environmental benefits like reducing runoff and replenishing groundwater compared to conventional impervious concrete pavement.

1. 2-Apr-17 Department of civil engineering, T.K.M.C.E
1

2. INTRODUCTION
 Pervious concrete - high porosity concrete- due to highly
interconnected void content
 Has little or no fine aggregate
 Allows water to pass directly
through-reduces the runoff and
recharges ground water
 Used in parking areas with light traffic, residential streets,
pedestrian walkways, and greenhouses
2-Apr-17
Department of civil engineering, T.K.M.C.E
2

3. PERVIOUS CONCRETE PAVEMETS
 A mixture of coarse aggregate, Portland cement, water and
little or no sand
 Controlled amounts of water and cementitious materials
creates a paste that forms a thick coating around aggregate
particles without flowing off during mixing and placing
 Has a 15-25% void structure, hence lightweight
2-Apr-17
Department of civil engineering, T.K.M.C.E
3

4. 2-Apr-17
Department of civil engineering, T.K.M.C.E
4
PERVIOUS VS IMPERVIOUS PAVEMENT
Pervious concrete pavement
Impervious concrete
pavement

5. MATERIALS
 Portland cement
 Coarse aggregate
 Water
 Cementitious materials
 Admixtures
2-Apr-17
Department of civil engineering, T.K.M.C.E
5

6. Material Proportions (kg/𝒎 𝟑)
Cementitious materials 270-415
Narrowly graded aggregate
(gravel/crushed stone)
1190-1480
w/c ratio 0.28-0.35 (with chemical admixtures)
0.34-0.40 (without chemical
admixtures)
Cementitious materials/Aggregate
ratio
1:0.21-1:0.25
Fine aggregate: Coarse aggregate
ratio
0 to 1:1
Polypropylene fiber (optional when
no fine aggregate is present)
0.1% by volume or 0.9 kg/𝒎 𝟑
2-Apr-17
Department of civil engineering, T.K.M.C.E
6

7. PROPERTIES
1. COMPRESSIVE STRENGTH
 Falls in the range of 3.5 MPa to 28 Mpa . Typical values are
about 17 MPa
2. FLEXURAL STRENGTH
 Ranges between about 1 and 3.8 MPa
 Influenced by degree of compaction, porosity, and the
aggregate-to-cement (A/C) ratio
2-Apr-17
Department of civil engineering, T.K.M.C.E
7

8. PROPERTIES (CONTD….)
2-Apr-17 Department of civil engineering, T.K.M.C.E
8
3. DENSITY
 Depends on
- The properties and proportions of the materials used
- Compaction procedures used in the placement
 In-place densities in the order of 1600 to 2000 kg/m^3 –falls
in upper range of lightweight concretes

9. PROPERTIES (CONTD….)
4. DURABILITY : FREEZE-THAW RESISTANCE
 It depend on the saturation level of the voids in the concrete at
the time of freezing
 Voids are saturated, complete freezing can cause severe
damage
2-Apr-17
Department of civil engineering, T.K.M.C.E
9

10. PROPERTIES (CONTD….)
5. ABRASION RESISTANCE
 Open and rough structure- abrasion and raveling of aggregate
on the surface can be a problem
 Hence Highways are generally not suitable for pervious
concretes
2-Apr-17
Department of civil engineering, T.K.M.C.E
10

11. DESIGN
 Designed to support the intended traffic load and manage
storm water strategy
 Should meet the hydrological and structural requirement
2-Apr-17
Department of civil engineering, T.K.M.C.E
11

12. CONSTRUCTION
 Subgrade –can be native material or imported fill
 Properly compacted- Density 90-95%, surface - Uniform and
stable
 Sub-base – clean gravel or crushed stone, if insufficient
percolation rate in the compacted site fill
 Subgrade and sub-base - moistened before placement of
pervious concrete layer
 Final layer –compacted by manually operated roller
2-Apr-17
Department of civil engineering, T.K.M.C.E
12

13. MIXING AND TRANSPORTATION
 Conventional concrete mixing equipment is used - mixing
times may be extended
 Cement may be replaced by about 10-30% of fly ash, 20-50%
of blast furnace slag and 5% of silica fume
 Fine aggregate will decrease the porosity and increase
strength
 Discharged completely within one hour after initial mixing
 Retarding admixtures - increase the discharge time
2-Apr-17
Department of civil engineering, T.K.M.C.E
13

14. PLACEMENT
 Placement - continuous, spreading - rapid
 Strike off about 15 to 20 mm above the forms
 Commonly used- mechanical vibrating screed, manual screeds
2-Apr-17
Department of civil engineering, T.K.M.C.E
14
Vibrating ScreedManual Screed

15. CONSOLIDATION
 Consolidation-by rolling over
the concrete with a steel roller
 Because of rapid hardening and
high evaporation rates, delays
in consolidation can cause
problems
2-Apr-17
Department of civil engineering, T.K.M.C.E
15
Steel Roller

16. CURING
 As pervious concrete
pavements do not bleed, they
have a high tendency for plastic
shrinkage cracking
 Recommended curing
procedure -fog misting followed
by plastic sheeting for 7 days
2-Apr-17
Department of civil engineering, T.K.M.C.E
16

17. MAINTENANCE
 Consists of prevention of clogging and surface raveling
2-Apr-17
Department of civil engineering, T.K.M.C.E
17
Raveling

18. MAINTENANCE(CONTD…)
 Cleaning by
 Power blowing
 Pressure washing
 Broom sweeping
2-Apr-17
Department of civil engineering, T.K.M.C.E
18
Broom sweeping

19. ENVIRONMENTAL BENEFITS
 Reduces storm water runoff
 Replenishes water tables and aquifers
 Eliminates - detention ponds - other costly storm water
management practices
 Allows for more efficient land development
 Prevents warm and polluted water from entering streams
2-Apr-17
Department of civil engineering, T.K.M.C.E
19

20. SAFETY BENEFITS
 Minimizes flash flooding and standing water
 Skidding is reduced
 Light reflectivity is higher than asphalt surfaces, hence reduce
heat island effect
 Glare from wet pavement is virtually eliminated
2-Apr-17
Department of civil engineering, T.K.M.C.E
20

21. PERVIOUS CONCRETE PROJECTS
2-Apr-17
Department of civil engineering, T.K.M.C.E
21
Parking for prime outlets mall in
Williamsburg, Virginia (7.6 acres)
Walkway in Beijing, China built
for 2008 Olympics

22. PERVIOUS CONCRETE PROJECTS (CONTD…)
2-Apr-17
Department of civil engineering, T.K.M.C.E
22
Green alleys in Chicago

23. DISADVANTAGES
 Runoff from adjacent areas onto pervious concrete needs to
be prevented
 If reinforcement is required, epoxy coated bars should be
used
 Concrete is variable in permeability; over vibration
significantly reduces permeability
2-Apr-17
Department of civil engineering, T.K.M.C.E
23

24. APPLICATIONS
 Pervious pavement for
 Parking lots
 Alleys and driveways
 Trees gates in sidewalk
 Tennis court
 Greenhouse floors
2-Apr-17
Department of civil engineering, T.K.M.C.E
24

25. CONCLUSION
2-Apr-17
Department of civil engineering, T.K.M.C.E
25
 Pervious concrete pavement construction is an exceptionally
good method to improve sustainability of construction. It
effectively recharges the ground water and also helps in
control of urban heat island effect. Even though compression
strength is low, it can be used for light traffic roads,
pavements, parking lots, and paving the front of houses.

26. REFERENCES
 S.O. Ajamu, A.A. Jimoh, J.R. Oluremi, “Evaluation of
Structural Performance of Pervious Concrete in Construction”,
International Journal of Engineering and Technology Volume 2
No. 5, May, 2012.
 Karthik Obla, “Pervious concrete overview”, The Indian
Concrete Journal,2012
 Dan, B. : “Pervious Concrete Pavement” A Win-Win System,
Holcim (US) Inc. Retrieved March 24, 2010 from
2-Apr-17
Department of civil engineering, T.K.M.C.E
26

27. 2-Apr-17
Department of civil engineering, T.K.M.C.E
27

28. 2-Apr-17
Department of civil engineering, T.K.M.C.E
28