Rheological and mechanical characteristics of basalt fiber UHPC incorporating waste glass powder in lieu of cement

Ultra-High-Performance Concrete (UHPC) represents an exceptionally durable construction material distinguished by its notable strength, ductility, and durability. Previous investigations have demonstrated a limited exploration of UHPC containing basalt fiber and waste glass as a substitute for cement. Current study concentrates on assessing the impact of incorporating waste glass powder (WGP) in lieu of cement, on the workability, mechanical properties, and microstructural attributes of this composite. The substitution involved three distinct proportions of waste pozzolanic glass powder: 10%, 20%, and 30%, measured by weight. A substantial number of test specimens, exceeding one hundred, was accurately prepared to inspect the engineering characteristics of five varied UHPC formulations. Experimental outcomes underline that the optimum UHPC compressive strength was recorded at the 28-day when employing a 0.75% basalt fiber content and replacing 20% of cement with waste glass. This investigation establishes the distinctive contribution of WGP pozzolanic constituents in enhancing the microstructure of UHPC.