A study was undertaken to calculate the efficacy of Engineered Geopolymer Cementitious Composites (EGCC) mixes with incorporation of activated slag and sisal fibers. Four different Composition of Concrete such as Slag Concrete (SC), Composite Concrete (CC), Green Concrete (GC), and Geopolymer Concrete (GPC) were cast and tested for their mechanical properties such as workability, compressive strength, and young’s modulus. Also, microstructural performance of these concrete compositions was studied using SEM and XRD. In Slag Concrete (SC) 30% clinkers, 70% activated slag was incorporated. In Composite Concrete (CC) 30% clinkers, 35% flyash, 35% activated slag was mixed. In Green Concrete (GC) 50% flyash and 50% activated slag was added. And in Geopolymer Concrete (GPC) 100% flyash was mixed into the concrete. The mixed compositions were activated by adding alkaline activator solution. All the concrete compositions were compared with Normal Concrete (NC) specimens. And the mixed cementitious concrete specimens were blended with 50% coarse aggregate and 50% Recycled Coarse Aggregate (RCA). Quarry Rock Dust (QRD) was used as fine aggregate in all composites. The test results reveal that within the examined concrete compositions, Composite Concrete (CC) with 30% clinkers, 35% flyash, 35% activated slag exhibit excellent workability and strength characteristics.

Keywords: Activated slag, Composite concrete, Engineered geopolymer cementitious composites, Green concrete, Geopolymer concrete, Quarry rock dust, Recycled coarse aggregate, Slag concrete.