1. Objective To prepare concrete cubes for testing compressive strength as per standards like IS 516, BS EN 12390, or ASTM C39. 2. Materials Required Cement Fine aggregate (sand) Coarse aggregate (stone/gravel) Water Moulds (usually 150 mm × 150 mm × 150 mm) Tamping rod or vibrator Trowel Weighing balance Curing tank or water bath 3. Cube Mould Preparation Clean the moulds thoroughly. Apply oil or releasing agent on all internal faces to prevent concrete from sticking. Assemble the moulds tightl