<p>This article evaluated the potential of commercial-grade activated carbon (CAC) and laboratory-synthesized green activated carbon (GAC) for the partial cement replacement in the concrete and for enhanced mechanical and durability properties. The activated carbon incorporation level altered from 0.5 to 5.0 mass% and its constitutional influence on the compressive strength (CS), split tensile strength (ST), water absorption, and acid attack resistance were assessed. The findings conveyed that while the optimal 0.5 mass% CAC enhanced the CS by 6.38%, the GAC at the same level facilitated marginally reduced strength but did met with the design criterion. Also, with respect to the control sample, 0.5 mass % CAC ascertained enhanced ST by 11.59% but the GAC of similar level reduced it by 2.89%. Both alternate additives improved acid attack resistance in terms of enhanced CS values by 17.74% and 8.81%, compared to control respectively. Even higher additive levels (above 0.5 mass%) reduced strength and durability. This was due to increased porosity and slower hydration. While water absorption tests affirmed good durability (3.4% and 3.9% values for 0.5 mass% CAC and 0.5 mass% GAC cases), even higher additive levels enhanced porosity and compromised upon the durability. Microstructural characterization with the FESEM, FTIR, and XRD revealed improved matrix densification and structural advantages of the activated carbon additive. Thus, the findings affirmed that 0.5 mass% of CAC or GAC is the optimal additive level and conveyed an optimal balance of strength and durability. Accordingly, the AC-concrete composites have been opined to be viable and sustainable alternatives for partial cement replacement-based CO₂ emissions in the cement industry.</p>