Dear Bhimsingh ,
It's pretty challenging to assess the grade used in any concrete after the ingredients have been mixed and specially when concrete has been placed.
Therefore , it's essential for the construction personnel to verify that the right grade of the specified cement has been procured , tested and stored in adequate quantity at the site well before the day of concreting.
We are in an era of quality assurance and not quality control.
The same concept applies to all other constituents of the self compacting concrete.