what should be the strength of Concrete cube strength for 7
days, if the designed mix is M20?
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Answer Posted / sumit
Design mix is M20 So Target strenth is Fck+4 = 24N/MM2
For 7 Days Cube strenth is 16.24 Exact (7days@67.67%)
For Individual Cube strenth become is Fck-3 = 13.24
But Average Sternth is required is 16.24 (must)
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