Nanosilica is silica with a nanoscale size ranging from 1 to 100 nm, which serves to enhance the compressive strength of concrete. Nanosilica can be synthesized from kaolin waste. The materials used in this study include kaolin and a magnetic stirrer as a mixing tool. This research employs variations in heating temperatures of 100°C, 120°C, and 140°C. Microstructural testing methods, includi…