Improving Ground Water Recharge Using Pervious Cement Concrete Made of Aggregates Recycled from Crushed Concrete Wastes

Abstract

Research Paper aims to study the application of aggregates recycled from Crushed Concrete wastes (CCW) has been applied in pervious cement concrete. The maximum size of the aggregate in proportion of 9.5 mm to 4.75 mm particle in the coarse aggregate of CCW on the properties of the pervious cement concrete is investigated. Typically pervious concrete has little to no fine aggregate and has just enough cementitious paste to coat the coarse aggregate particles while preserving the interconnectivity of the voids. The work includes, type and volume of CCW from various sources in the city of Bangalore; testing and evaluating quality of aggregate made from CCW and evaluating effect of replacement of natural aggregate by recycled aggregate in medium- grade pervious cement concrete. High strength cement allows pervious cement concrete to be produced with water cementitious materials ratios in the range of 0.30 to 0.34. This relatively high level of water reduction and efficient cement dispersion maximizes the strength potential of pervious concrete mixes using CCW. The 28-day compressive strength of CCW used pervious cement concrete was about 3% to 11 % lower than that of the pervious cement concrete made of regular coarse aggregate. The decrease in strength can be compensated for by normal mixture adjustments to achieve the desired strength control. The infiltration rate of pervious cement concrete made of CCW fall in the range of 70 to 680 liters per minute per square meter. Pervious cement concrete made of CCW can be used in parking areas, areas with light traffic, pedestrian walkways, nature trials and plazas. Pervious cement concrete made of CCW is used in building site design, it aids in the process of qualifying for LEED Green Building Rating system credits available for using recycled products.