The Concrete Cube Test is the most common method to determine the compressive strength of hardened concrete. Standard cubes (150×150×150 mm) are cast, cured, and tested in a compression testing machine (CTM) at specific ages (7, 14, and 28 days). 7-day strength ≈ 65–70% of 28-day strength 28-day strength = Characteristic strength of concrete Civil Wisdom #quality #QualityControl #stone #Aggregates #civilengineering #T | Civil Wisdom