An Experimental Investigation on Porosity and Permeability Co-efficent for Pervious Concrete Pavement by Statistical Modelling

Abstract

Abstract: Pervious concrete has varieties of names such as porous concrete, permeable concrete, no fines concrete and porous pavement. It is a special type of concrete with high permeability rate with porosity used for roadways applications that allows water from precipitation and other sources to pass directly through thereby reducing the runoff from a site and allowing recharge. The present research concentrates about bringing out the most efficient porous concrete by varying water cement ratios and size of aggregate. The main properties studied include porosity, compressive strength and water permeability. These properties were compared with those for conventional concrete. Although water permeability is the most important characteristic of the pervious concrete, there is no well-established method for its quantification. Therefore, an experimental procedure to assess the water permeability of pervious concrete is developed. Fine Pervious concrete is considered as FPC, Coarse Pervious concrete is considered as CPC, Nominal Pervious concrete is considered as NPC. Water cement ratios used are 0.28, 0.30, 0.32 and 0.34. It is observed that out of all varying water cement ratios from 0.28 to 0.34, FPC 3 got the highest compressive strength and later it decreased. CPC 2 got the highest compressive strength and later it decreased. NPC 1 got the highest compressive strength and later it decreased. However there is a lot of deviation in compressive strengths from grade of concrete since it is pervious concrete. It looks clear that with increase in water cement ratio there is decrease in Porosity percentage and permeability.