It depends on the size of the unspecified cube size, and what and how they are to be used? More information is needed.
Mainly it is because of water cement ratio(w/c ratio) Handling of cube Treatment of cube Curing
10
Concrete is very important to the Romans because they were the first people who invented the hydraulic cement based concrete. The Roman did build very many concrete structures like the Pantheon in Rome.
.029 cubic yards of concrete weighs aproximately 93.96lbs
25 Yards of concrete
6
Basically, the force supplied by a concrete compression machine is a definite value. For normal concrete strength application, say below 50MPa, the stress produced by a 150mmx150mmx150mm cube is sufficient for the machine to crush the concrete sample. However, if the designed concrete strength is 100MPa, under the same force (about 2,000kN) supplied by the machine, the stress under a 150mmx150mmx150mm cube is not sufficient to crush the concrete cube. Therefore, 100mmx100mmx100mm concrete cubes are used instead to increase the applied stress to crush the concrete cubes. For normal concrete strength, the cube size of 150mmx150mmx150mm is already sufficient for the crushing strength of the machine.
I think due to the presence of Cao in the cement.... it may be the result of excessive drying of concrete cubes too...
You cannot calculate standard deviation for objects such as concrete cubes - you can only calculate standard deviation for some measure - such as side length, surface area, volume, mass, alkalinity or some other measure.
488 cubes
3 cubes x 3 rows = 9 cubes
24 cubes would be it.
Coal cubes: 0. Sugar cubes: 0 Painted cubes: maybe some of them.
126
13 cubes 4,9,16,25,36,46,64,81,100,121,144,169,196
Assuming that the cubes are 1x1x1, there will be one thousand cubes in the larger cube.
20 cubes