Essay On Pervious Concrete

ABSTRACT Pervious concrete is a type of concrete with high porosity. It is used for concrete flatworks application that allow the water to pass through it, thereby reducing the runoff from a site and allowing ground water recharge. The high porosity is attained by a highly interconnected void content. Typically pervious concrete has water to cementisious material ratio of 0.28 to 0.4.The mixture is composed of cementisious materials, coarse aggregates and water with little to no fine aggregates. Addition of a small amount of fine aggregates will generally reduce the void content and increase the strength. The present project deals with the study and comparison of mechanical properties, workability and density of different grades of pervious concrete(M15,M20,M25).

Keywords: pervious concrete, no

The aggregate was tested for its physical requirements such as gradation, fineness modulus, specific gravity in accordance with IS: 2386-1963.The sand was surface dried before use.

Table-2 Properties of fine aggregates

Fineness modulus 2.4

Specific Gravity of fine aggregate 2.55

Free moisture 2%

3.3 COARSE AGGREGATES: Crushed aggregates of less than 12.5mm size produced from local crushing plants were used. The aggregate exclusively passing through 12.5mm sieve size and retained on 10mm sieve is selected. The aggregates were tested for their physical requirements such as gradation, fineness modulus, specific gravity and bulk density in accordance with IS: 2386-1963. The individual aggregates were mixed to induce the required combined grading. the particular gravity and water absorption of the mixture are given in table.

Table-3 Properties of coarse aggregates

Specific Gravity of coarse aggregate 2.60

Water absorption 1%

3.4 WATER : Potable water fit for drinking is required to be used in the concrete and it should have pH value ranges between 6 to 9. 3.5 HYPER