Percentage strength of concrete at various ages: The strength of concrete increases with age. Table shows the strength of concrete at different ages in comparison with the strength at 28 days after casting. Age 1 day 3 days 7 days 14 days 28 days

Strength per cent 16% 40% 65% 90% 99%

Compressive strength of different grades of concrete at 7 and 28 days Grade of Concrete

Minimum compressive strength N/mm2 at 7 days

M15 M20 M25 M30 M35 M40 M45

10 13.5 17 20 23.5 27 30

Specified characteristic compressive strength (N/mm2) at 28 days 15 20 25 30 35 40 45

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