Impact of Fine Aggregate on Properties of Geopolymer Concrete

Geopolymer concrete (GPC) offers a sustainable alternative to ordinary Portland cement (OPC) concrete. This study investigates the influence of fine aggregate type on the strength and durability of GPC. River sand, manufactured sand, and granulated steel slag were used as fine aggregates their influence on mechanical behaviour were evaluated at various durations. Durability performance was assessed through water absorption, porosity, and acid resistance, sulphate resistance tests. The results confirm that the type of fine aggregate significantly impacts the strength and durability of GPC. River sand generally yielded the highest strength, while granulated steel slag exhibited the lowest. Water absorption and porosity were lower for GPC compared to OPC concrete, indicating improved durability. The lower density of GBFS-incorporated GPC makes it suitable for reducing dead load. Moreover, GPC with M-sand demonstrates exceptional resistance to water and chemical penetration, ensuring its durability as a structural material. Its high early strength also positions it favorably for use in pavements and retrofitting projects.