Nanosilica is a nano-sized silica that ranges from 1-100 nm and has a function to increase the compressive strength of concrete. Quality nanosilica can be produced with a synthesis process from fly ash waste. The materials used in this research are fly ash, HCl solution, NaOH, Methanol, Ammonia, and demin water. The material will be synthesised using the sol-gel method. This research uses varia…