railway DFCCIL Executive 2025 Mock Test Reinforced Concrete Structures Introduction

The target mean strength fm for concrete mix design obtained from the characteristic strength fck and standard deviation σ, as defined in IS:456-2000, is

1
fck + 1.35σ
2
fck + 1.45σ
3
fck + 1.55σ
4
fck + 1.65σ
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