PERVIOUS CONCRETE WITH BOTTM ASH AND COPPER SLAG

S. Geetha, Selvakumar Madhavan

Abstract: Pervious concrete is a porous concrete with voids which has no fine aggregates in it thereby facilitating the drainage of rain and storm water. The interconnected porosity of the porous concrete facilitates runoff from paved areas thereby preventing water logging which causes discomfort to passengers on roads. Moreover the rough surface of the pervious concrete prevents skidding of vehicles and it has also been reported that it absorbs sound and minimizes the deposition of fine dust on the pavement surface. This type of concrete has been successfully used in pavement and parking lots. Several researchers have optimized the proportion of aggregate that can be used in pervious concrete in order to achieve maximum permeability. But as the void content increases the strength of the concrete is reduced. Pervious concrete can be designed by using little or no sand thereby proportioning the concrete to have considerable voids. The binder content is very minimum sufficient enough to just coat and bind the aggregate particles together. The coarse aggregate used can be of single gradation or gap graded to facilitate the formation of voids which are interconnected. Approximately 20 to 30% voids are present in the hardened concrete and research has shown that flow rate of 0.25 to 0.38 cm/sec can be achieved if the gradation of aggregate is designed with gap graded aggregate. The disadvantage of the pervious concrete is its low strength compared to conventional concrete. But it has been tested and reported that it has the sufficient strength that can take up the vehicle load and other loads for many other applications. This paper discusses about the suitable mix proportion for the pervious concrete that uses copper slag and bottom ash as fine aggregate and properties of the concrete in terms of strength and durability.

Keywords: Pores, Strength, Permeability, Durability

DOI: https://doi.org/10.15623/ijret.2016.0526004