Mechanical characteristics of self-compacting concrete with silica fume and stone dust

Stone dust is a byproduct of stone crushing and is used as a partial substitute for natural sand in the production of concrete. Therefore, this research aimed to analyze the effect of stone dust as sand substitute material on the mechanical properties of self-compacting concrete (SCC) using silica fume to enhance performance and limit industrial waste. The experiment was conducted by creating concrete mix using 9% silica fume as a cement substitution and varying percentages of stone dust as a sand replacement at 0%, 2.5%, 5%, 7.5%, 10%, and 12.5%. The parameters tested were compressive strength, modulus of elasticity (MOE), and modulus of rupture (MOR), after concrete reached 28 days of age. The results indicated that all mix with 9% silica fume and variations in stone dust met the requirements for SCC. The highest compressive strength, MOE, and MOR were achieved at 5% stone dust variation with a value of 54.69 MPa, 21420.23 MPa, and 8.5 MPa, respectively. This research shows that the use of stone dust as a substitute material can enhance concrete quality and provide an environmentally friendly solution for managing industrial waste.