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Abstract: This research report presents the study on material characteristics of GPC by using natural aggregate and Recycled Coarse Aggregate. Experiments were conducted on the effect of variation of alkaline solution and different molarities on the mechanical properties of GPC. The alkaline liquid used for the present study was sodium silicate and sodium hydroxide solution with varying ratios of 2, 2.5 and 3. The molarities chosen for the sodiumhydroxidesolutionwere8M, 10M and 14M. The test specimens were 150mm size cubes and100x200mmcylindersheat-cured at 60 Cinanoven. The compressive strength was about 18to39 MP a and split tensile strength was in the range of3to3.8MParespectively.In this investigation on GPC using RCA, a total of 9 mixes were cast and tested, out of which three were conventional concrete mixes and six GPC mixes having varying combinations of fly ash, GGBS and RCA. The test specimens were 100mm size cubesand100x200mmcylinderscuredat90°Cinanovenfor18hours.Furthsize 150mm GPC cube specimens were cured at ambient temperature conditions. The studies showed that the compressive strength and spilt tensile strength of different mixes decreased with the increase in the percentage of recycled coarse aggregates.