Influence of recycled concrete aggregates and slag on the performance of pervious concrete

Abstract

This paper examines the properties of pervious concrete made with recycled concrete aggregates (RCA) and slag. RCA replaced natural aggregates at varying percentages of 0, 50, and 100%, while slag replaced 50% of cement. Pervious concrete mixes were prepared with porosities of 10 and 20%. Slump, hardened density, total void content, compressive strength, and flexural strength were assessed to characterize the performance. Results showed that RCA replacement led to an increase in void content and a decrease in slump and hardened density. The strengths decreased owing to a weak RCA particle and a weak interface between the RCA and new cement paste. Yet, the incorporation of slag could enhance the slump, hardened density, compressive strength, and flexural strength, while reducing the void content. Experimental findings highlight the ability to employ pervious concrete made with 100% RCA and 50% slag in pavement applications.