In this paper an experimental investigation is carried on hardened fine grinded fly ash replaced concrete. The concrete cubes were casted with FGFA as replacement at various proportions ranging from 0% to 50%. The experiments were done on cibes on various ages between 7 days to 180 days. The results show that the strength attainment was slow through the dormant period. On 28 days which is the standard test day all FGFA replaced specimens poses lesser strength than the control specimen. But as the time increases the strength attainment also increases for specimens with FGFA replacement ©IAEME Publication