Development of GGBS based high-strength one-part geopolymer concrete and its properties

The study presents a rational approach for design and optimization of high-strength One-Part Geopolymer Concrete (OP-GPC) mixes for a targeted compressive strength of 70 MPa using Response Surface Methodology (RSM). The model generated through RSM showed significant statistical relationship between the selected input and output variables. The high-strength OP-GPC was designed with ground granulated blast furnace slag as primary binder and anhydrous sodium metasilicate as the solid activator. The RSM model established statistically significant relationships between design parameters and compressive strength, which were subsequently validated through laboratory experimentation. The optimized OP-GPC have achieved compressive strength in the range of 70 MPa-76 MPa at 28 day. The experiments showed that approximately 90% of the targeted compressive strength was achieved within initial 7 days. The mechanical performance of high-strength OP-GPC was measured in terms of flexural and split-tensile strengths which was measured at 7.37 MPa and 5.32 MPa at 28 days, respectively. The durability of high-strength one-part GPC was also measured which showed low permeable void content of 8.17%, sorptivity of 0.0010 mm/s