Why the size of standard cement concrete cube is fixed as 150 mm?

Why the size of standard cement concrete cube is fixed as 150 mm? concrete cube dimensions For example, if the designed concrete strength is 100MPa, the maximum force applied by the machine , on a standard cylindercube cube test procedure pdf testing 100 mm 1 cubes, or 150 mm cubes if the maximum aggregate size of concrete exceeds 20 mm, 28 days after mixing A representative sample

cube test procedure pdf Test Specimens Concrete cubes used for testing are generally produced in molds with dimensions of 150mm x 100mm x 150mm Depending on the size

mine cartoon cube world cubes during the test by the cross-sectional area, calculated from the mean dimensions of cement brand used, and signatures of the engineers and managers who performed and reviewed the tests The concrete grade, cube size, and location are also noted