    Question

# The strength of a fully matured concrete sample is 500 kg/cm2. When cured at an average temperature of 20∘C in day, 10∘C in night, datum temperature T0, is −11∘C. If Plowman constants A is 32 and B is 54, the strength of identical concrete at 7 days will be nearly :

A
333 kg/cm2
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B
312 kg/cm2
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C
272 kg/cm2
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D
243 kg/cm2
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Solution

## The correct option is A 333 kg/cm2Maturity of concrete at the age of 7 days M=Σ (time×temperature) M=[20−(−11)]×12×7+[10−(−11)]×7×12 M=2604+1764 M=4368∘C−hr % of strength of concrete of maturity of 4368∘Chr f=A+B log10(M×10−3) f=32+54 log10(4368×10−3) f=66.57% Strength of concrete at 7 days=0.6657×500 =332.85 kg/cm2 =333 kg/cm2  Suggest Corrections  0      Similar questions  Related Videos   Maturity of Concrete
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