Generally, the most obvious reason for cracks is settlement. Settlement does not only mean that foundation gets settled and it leads to cracks in building. Settlement is a very large term and is not only limited to the foundation. It can also occur because of material you have used for brick...
Minimum bending stress is developed at circular manhole
compare to square and rectangle.
No torsional stress is developed in circular but it will be there at corner of rectangle /square/or any straight edged shape
It represents sample of population of real concrete.
To test a blood of human , one cant take out all blood, sameway sample taken properly will also give fair results. in all shape cube is perfect and easy to manage.
so concrete cube is necessary
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