Properties of pervious concrete with recycled concrete aggregates and cement replacements

Abstract

Pervious concrete, being an environmental friendly type of concrete, has been in demand to control surface runoffs and restore ground water. This study focuses on creating sustainable pervious concrete consisting of recycled concrete aggregates (RCA) replacing coarse natural aggregates (NA) up to 100%. The primary binder ratios have been finalised as 70% ordinary Portland cement (OPC) and 30% fly ash (FA). The incorporation of cement additions has also been encouraged in the form of silica fume (SF) and metakaolin (MK). Ternary and quaternary pervious concrete mixes have been prepared after replacing FA with SF and MK in the binder mix. The mechanical properties of pervious concrete mixes have been examined at different curing ages. The porosity and density of pervious concrete mixes have also been determined. Based on the results of the different mechanical properties, the optimum of all the pervious concrete mixes has been ascertained. In general, addition of SF and MK by replacing FA partially in the binder mix has proven to be advantageous for the properties of RCA pervious concrete. The mix with 10% FA, 10% SF and 10% MK containing 25% RCA content has the best mechanical properties among all the mixes.