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
Percentage strength of concrete at various ages.pdf
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Page 1 of 1. 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 Strength per cent. 1 day
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