Cubes are not cast as per cum of concrete but as per the standard frequency stated in your specification or as per codal provision.
In one sample of concrete, 1 set (set consist of 3 cubes) should be casted.
For acceptance and rejection of the concrete ultimate criteria is 28 days test results or base on your concrete mix design (some designs target to achieve strength at 60 or 90 or further ages depending on there need and cost optimization)
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