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Sulfate attack and accelerated carbonation tests were conducted on six concrete mixes made with 100% recycled concrete aggregate (RCA) and 30% fly ash (FA) blended with 70% ordinary Portland cement (OPC). The dosage of both graphene oxide (GO) and graphene oxide ball-milled (GObm) added in the concrete mixes were 0.05% and 0.1% by weight of binders. The percentage change in mass was observed to increase but the residual compressive strength decreases with advancing exposure to sulfate solution. The carbonation depth decreases with increasing percentage of graphene oxide in the mixes made with 100% RCA compared to mix without graphene oxide. However, with increasing exposure to CO₂, the carbonation depth was observed to increase for all the mixes. The X-ray diffraction analysis (XRD) was conducted on 90 days old samples exposed to sulfate solution, to confirms the presence …