Replacing traditional cement with high clinker content swiftly reduces mortar and concrete's carbon footprint, as cement accounts for 70% of it. Research suggests limestone and metakaolin could replace current clinker production. Studying binary systems (limestone/cement and metakaolin/cement) reveals their impact on flow and compressive strength. A model correlates compressive strength with porosity, showing limestone and metakaolin accelerate clinker hydration, boosting early strength in proportion to their surface area.