Railway Concrete Technology-4
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→
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φ
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±
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σ 1n
)x(
2
−µ−∑
µ
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Area covered with 3 on both side 99.9 %~σ
2.2%13.6%
34.1% 34.1%
13.6%2.2%
3 σ 3 σ
σ σ σ σ σ σ
Area = 0.95
Area = 0.05
P r o b a b i l i t y D e n s i t y
1.00
0-3 -2 -1 0 1 2 3
µ-3σ µ-2σ µ-σ µ µ+σ µ+2σ µ+3σ
f ck 1.65σ
µ
f c
f c= Strength Test Value
= Mean Strength
= Standard Deviation
µ
σ
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Strength (MPa)
Test Results
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≥
≥
≥ ≥
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≥ ≥
98.224
9.22232422=
+++
88.224
50.1950.2475.2475.22=
+++
96.224
1875.232.259.24=
+++