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This invention develops foamed concrete blocks using fly ash, rice husk ash and ground granulated blast furnace slag, achieving a target dry density of 1200 kg/m³ for low-carbon, affordable housing. Mechanical and transport properties, including compressive strength, flexural strength, porosity, and sorptivity, were evaluated. Scanning electron microscopy (SEM) revealed a well-distributed pore structure contributing to strength and durability. The results confirm that waste-engineered foamed concrete offers acceptable performance for non-load-bearing applications. This innovation enables the construction industry to reduce cement usage, lower carbon emissions, and promote circular economy practices, offering a sustainable, cost-effective solution for modern housing and infrastructure development.