The target mean strength for mix design of concrete is always higher than the characteristic strength to account for the variability in concrete production. The factor 1.65 is used with the standard deviation to achieve a certain probability of not failing below the characteristic strength.
In mix design for M25, the target mean strength of concrete as per IS : 10262-2009 (take standard deviation = 5 N/mm²) is
Asked in Civil Engg GA 24 2023 CO 1505 2024 · Topic: Mechanics (Elasticity (Stress, Strain, Hooke's Law, Elastic Moduli))
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