▎ 摘　　要

This investigation was carried out to encourage the use of recycled concrete aggregate (RCA) in the construction industry. The enhancement in performance of concrete composites made with 100% replacement of natural aggregate (NA) by recycled concrete aggregate (RCA) in addition of synthesized graphene oxide (GO) and GO ball milled (GObm) were observed on the mechanical and durability properties of the concrete. Six mixes were prepared, of which the control mix was prepared with 100% NA with 70% Portland cement (OPC) and 30% fly ash (FA) and the remaining mixes with 100% RCA with 0%, 0.05% and 0.10% GO and GObm inclusion by weight of binder. The compressive strength, electrical resistivity and ultrasonic pulse velocity (UPV) of the mixes with 100% RCA escalated with percentage increase in graphene oxide but lesser compared to control mix. However, the sorptivity and initial surface absorption reduces with percentage increase in GO and GObm content in the concrete mixes compared to mix without GO. Overall, the 0.1% GO and GObm addition has significantly improved the mechanical and durability properties of the concrete containing 100% RCA and comparable to control mix. The 100% RCA with GO and GObm inclusion were observed to have better economy index and higher overall desirability function compared to control mix. Thus, optimum used of waste materials in construction industry can be possible with inclusion of graphene oxide.