This paper discusses the strength development of concrete using Foundry Slag(FD) as partial replacement for conventional fine aggregates and Alccofine (AF) as partial replacement of cement. Concrete samples of M100 grade using water/binder ratio 0.239, with varying percentage of FD (0 to 50%) and with optimum percentage of AF(15%) were casted and tested for compressive strength(CS), tensile strength(TS) and flexural strength(FS) development at the age of 7, 14, 28, 56 and 90 days. Replacement of fine aggregates with up to 45% of FD showed an increase in CS, FS and TS at all ages but showed a decrease in these properties with 50% of FD. Results suggested that reasonably high strength concrete can be designed by substituting fine aggregates with 10% to 45% of FD and partial replacement of cement with 15% of Alccofine. Carbonation in terms of alkalinity test and Rapid Chloride Permeability Test had also been studied in the present research work. Result showed increase in alkalinity and improvement in permeability of concrete with increase in FD contents at optimized (15%) replacement of Cement with Alccofine.

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In this study, non-destructive testing (NDT) such as ultrasonic pulse velocity (UPV) and Schmidt rebound Number(RN) are correlated with compressive strength(CS) of high strength concrete prepared with Foundry slag (FD) which is used as a partial substitute of fine aggregate in varying proportions (0, 10, 20, 30, 40, 45 and 50%) and alccofine1203(AF) was used in optimum amount of 15% of cement as a partial substitute for Portland Pozzolana Cement(PPC) and relationships were developed after 28 days of curing .150 mm x 150mm x 150 mm cube samples were casted, cured for 7, 14, 28, 56 and 90 days, dried and tested in the laboratory for estimating UPV, RN and CS. Results showed increase in UPV and RN with increase in FD content and age. UPV and RN also showed increase with CS. Then CS was compared with UPV and RN to develop the correlation between them. The best fit curve for CS with UPV and RN relationships were obtained after 28 days of curing through processing correlation among the data sets and equations were developed. These equations can be applied to existing concrete structures as well as newly constructed concrete structures for the determination of relative strength properties.

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