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Question

Find the compressive strength below which 50% test results are expected to fall for M20 concrete

A
20
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B
26.6
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C
13.4
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D
30
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Solution

The correct option is B 26.6
50% Test results fall below mean compressive strength fm

fm=fck+1.65σ

=20+1.65×4

=26.6 MPa

[M20 has fck=20 MPa and σ=4 MPa ]

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