Pervious concrete

what is Pervious concrete

1. P E R VI O US C ONCRETE Pervious Concrete Tech Sethia FOLLOW FOR VIDEO LECTURE WITH COMPLETE EXPLAINATION

2. I NT R O D U C TION 2 It is a special type of concrete with a high porosity used for concrete flatwork applications that allows water to pass directly. It reduces the runoff and allowing groundwater recharge The high porosity is attained by a highly interconnected void content. Recognized as the best management practice by US Environment Protection agency (EPA) Pervious Concrete

3. P ERVIOUS CONCRETE 3 It is a mixture of Cement, Corse aggregate and with or without sand and has enough cementitious paste to coat the coarse aggregate while preserving the interconnectivity of the voids. This concrete is being used as paving material to solve or reduce the storm water runoff to the drainage system and minimize water logging problems Pervious Concrete

4. It is an important application for sustainable construction It is one of many low impact development techniques used by builders to protect water quality. Fig.1 Pervious Concrete Source: http://www.stevensonconcrete.com 4 Pervious Concrete

5. Fig. 2 Schematic representation of Source: http://www.stevensonconcrete.com 5 Pervious Concrete

6. PERVIOUS CONCRETE IMPERVIOUS CONCRETE Fig.3 Transpiration rate of Pervious and impervious Concrete 6 Pervious Concrete

7. PERVIOUS I M PE R V I O US Fig. 4 Pervious and impervious concrete pavement Source: http://www.google.com 7 Pervious Concrete

8. H ISTORY OF PERVIOUS CONCRETE It was first used in 1852. Pervious Concrete was first used in 1852. It has been employed in European countries Pervious concrete has been employed in European countries since the nineteenth century. The earliest usage of pervious concrete in modern history was for two houses in England. Over 900 houses were built from for two houses in England. Most houses using pervious concrete are in the United Most houses using pervious concrete are in the United Kingdom 8 Pervious Concrete

9. PROPERTIES OF PERVIOUS CONCRETE: CONCRETE: 9 Fresh Properties The plastic pervious concrete mixture is stiff compared to The plastic pervious concrete mixture is stiff compared to traditional concrete. traditional concrete. Slumps, when measured, are generally less than ¾ inches (20 mm), although slumps as high as 2 inches (50 mm) have been used Pervious Concrete

10. H ARDENED P ROPERTIES 10 Density and Porosity The densities are in the order of 1600 kg/m3 to 2000kg/m3. 2000kg/m3. The void contents of the pervious concrete ranges from 20 to 25%. to 25%. Permeability Typical flow rates for water through pervious concrete are 120 L/m²/min. 120 L/m²/min and 3.8 MPa. Pervious Concrete

11. Compressive Strength Pervious concrete mixtures can develop compressive strengths in the range of 3.5 MPa to 28 Mpa. Typical values are about 17 MPa. Flexural strength Flexural strength in pervious concretes generally ranges between about 1 MPa 11 Pervious Concrete

12. M ATERIALS USED 12 Aggregates Cementious Materials Water Admixtures Pervious Concrete

13. A GGREGATES Pervious concrete has little or no fine aggregates in the mixture. Aggregate size is typically between 3/8 to1/2 inch maximum. Fig. 5 Aggregate Source: http://www.wikipedia.com 13 Pervious Concrete

14. C EMENTIOUS MATERIALS 14 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) of cement. Pervious Concrete

15. Table 1 Physical properties of Cement Source:[1] 15 Pervious Concrete

16. W A TER Water meeting standard requirements for conventional concrete can be used for the production of pervious concrete Fig.6 water Source: http://www.stevensonconcrete.com 16 Pervious Concrete

17. A DMIXTURES Air entraining admixtures may be used to improve the freeze/thaw durability of the paste/mortar. Fig.7 Concrete with admixture Source: http://www.google.com 17 Pervious Concrete

18. Table 2: Typical Pervious Concrete Materials Proportions 18 Source :[1] Pervious Concrete

19. M AINTEN A N C E 19 Maintenance of pervious concrete pavement consists primarily of prevention of clogging of the void structure. Cleaning options may include power blowing and pressure washing. Pressure washing of a clogged pervious concrete pavement has restored 80% to 90% of the permeability in some cases. Pervious Concrete

20. E NVIRONMENTAL B ENEFITS Reduces storm water runoff Eliminates need for detention ponds Replenishes water tables and aquifers. Allows for more efficient land development. Minimizes flash flooding and standing water. Prevents warm and polluted water from entering streams. Mitigates surface pollutants. Light reflectivity is higher than with asphalt surfaces, reducing any heat island effect. 20 Pervious Concrete

21. D ISADVANTAGES 21 Runoff from adjacent areas onto pervious concrete needs to be prevented. The parking areas are generally limited to auto parking and occasional trucks. If reinforcement is required, epoxy coated bars should be used. Concrete is variable in permeability; over vibration significantly reduces permeability. It is still a new material that requires acceptance from cities and states. Pervious Concrete

22. A PP L IC A TIONS 22 Pervious pavement for parking lots. Alleys and driveways. Trees gates in sidewalk . Swimming pool decks. Tennis court. Greenhouse floors. Pervious Concrete

23. CONCLUSION 23 The pervious concrete helps the water to infiltrate Cities with pervious pavements would be safer for traffic, be cleaner and less pollution. Pervious Concrete

24. R EFE R E N CES Hisar ,Vikram1, Mahla R.P(2015) “Experimental Study of Pervious Concrete Pavement” International Journal for Research in Applied Science & Engineering Technology (IJRASET) . Shri, S. Deepa and R. Thenmozhi. (2012). "Flexural behavior of hybrid fibrocement slabs with micro concrete and fibers." Int J Emerg Trends Eng Dev 4(2): 165-177. Jing Yang, guoliang jiang. (2003). “Experimental study on properties of pervious concrete pavement materials”, Cement and Concrete research 33(2003) Pg No 381-386. Krishnaraj, C., Mohanasundram, K. M. and S. Navaneetha santhakumar.(2012). “ Implementation Study Analysis of Ft fmea Model in Indian Foundry Industry ” . Journal of Applied Sciences Research, 8(2): 1009-1017. 24 Pervious Concrete

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