Influence of grading recycled concrete aggregates on the properties of pervious concrete

Abstract

This research study focused on the influence of grading coarse recycled concrete aggregates (RCAs) on the properties of pervious concrete. Five pervious concrete mixes were prepared using 100% RCAs. The size of the aggregates was categorised into two different groups of size 4.75–10 mm and 10–12.5 mm, varying the proportions from 0 to 100%. The pervious concrete specimens were tested for compressive, splitting tensile and flexural strengths along with ultrasonic pulse velocity. The porosity, permeability and density of the pervious concretes were also measured. A significant enhancement in strength properties was noticed after increasing the percentage of smaller-sized aggregates. Mixes containing 75% smaller aggregates showed an enhancement of 71.5% in compressive strength over mixes containing 100% of larger aggregate. Properties such as permeability, porosity and density were also enhanced due to an increase in smaller aggregate content. A mix with 75% smaller-sized aggregates was found to be the optimum among those tested in the study as it displayed improved results in terms of porosity, permeability, density and strength.