Frederico Caldeira Knabben
fc'=0.87 fck fc'= cylinder strength fck= cube strength
fc'=0.785 fck fck=1.273 fc' fc'=strength of cylinder fck=strength of cube
C20/25
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The modulus of elasticity of concrete is denoted by Ec .Ec = 5000 sqrt fck as per IS standardswhere, fck- The compressive strength of concrete at 28 days in N/mm2 .
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the compressive strength can be converted in to flexural strength by following formula of IS code 456-2000fcr=0.7^/- fck fcr= flexural strength fck= characteristic compressive strength in N/mm2
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