A Study on Pervious Concrete: A Review

: Pervious concrete is a mixture of gravel, aggregate, cement, little or no sand with or without admixture. Pervious Concrete is a specialty concrete used to allow water to intentionally pass through the surface of a pavement and allow storm water to eventually absorb back into the surrounding soils or evaporate. This keeps runoff water from downstream urban flooding and erosion. Pervious concrete pavements are “best management practices” to collect, clean and cool storm water. In urban region due to increase in impervious area infiltration is reducing, therefore, ground water level is going down. Scarcity of groundwater is observed and hence use of pervious concrete to eliminate this problem improve groundwater recharge should be adopted. its void content range from 18-35%. the infiltration rage of pervious concrete will fall into range of 80-720 litres per square meter. So the time test was adopted in which enough time was allowed for water to penetrate into the pores to get accurate result of porosity. So it can be concluded that water displacement method performed on core filled offers good flexibility to obtain samples. B.HUANG, J.CAO, X.CHEAN AND X.SHU Conducted to study of permeability and strength properties of pervious concrete. A preliminary study has been conducted to study. the effect of aggregate gradation of 4.75mm,9.5mm and 12.5mm on the strength and permeability characteristics of pervious concrete based on limited laboratory and analytical results. the compressive strength and indirect tensile strength of pervious concrete with larger size aggregate was larger, which can be attributed to the smaller air void and more the cement paste between aggregate if considering a aspect ratio. For pervious concrete, due to high air void, Darcy’s Law is no longer valid. Therefore, proper procedures should be used to characteristic the permeability of pervious concrete. The values of pseudo-coefficient of permeability increased as aggregate size increased, which means the hydraulic conductivity increased as aggregate size increased. Darshan S. Shah, Jayeshkumar Pitroda conducted to study on durability and water absorption properties of pervious concrete. This paper represents the experimental methodology and experimental results related to durability and water absorption. 8 Cylinders of size 100 mm Ø and 200 mm height are prepared to investigate both these properties and this cylinder are immersed in sodium chloride (NACL) with concrete mix proportion 1:6, 1:8, and 1:10 with different size of gravel 18.75 mm and 9.375 mm. That’s conclusion is water absorption and durability are inversely proportional to each other means that, concrete made by 1:6 mix proportion has more durability and less water absorption and concrete made by 1:10 mix proportion has more water absorption and less durability. Narasimha have study on characterization of pervious concrete for pavement application. Four sizes of coarse aggregate namely-4.75mm to 9mm, 9mm to 12.5mm, 12.5mm to 16mm, 16mm to 19.5mm. Mixes were prepared with the water cement ratio of 0.34, maintaining the aggregate cement ratio as 4:1.This study illustrates angularity number, which influence properties and behavior of pervious concrete with fine aggregate and coarse aggregates. It is observed that the increase in fine aggregate results in reduction of volume of voids which in turn increase of compressive strength, flexural strength and split tensile strength. Angularity number is more for higher size aggregate and which is reduced when size of aggregate reduces. The range of compressive strength varies between 10 N/mm2 to 26 N/mm2 when the angularity number varied from 8 to 4. Coefficient of permeability increases from 0.4cm/sec to 1.26 cm/sec when the angularity number is in the range of 4 to 8. The optimum mixes in each coarse aggregate size are identified based on the compressive strength. flaky, and irregular to used angularity number 13,10,and 7. Higher angularity number produce more permeability. Rate of reduction of permeability with Water/Cement ratio concrete aggregate angularity