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 abu cangkang sawit waste. The materials used in this study include abu cangkang sawit and a magnetic stirrer as a mixing tool. This research employs variations in heating temperatures of 100°C, 120°C, and 140°C. Microstructural …