why the compressive strength of concrete is calculated only after 28 days.why not after 25, 26,27 days..
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Answer Posted / joseph
The compressive strength is calculated at 3 ,7 ,28 days.if
you want to transport a precast structure of the grade
40/20 ,it should aquire 60% of design strength ..here it is
60% of 40.In seven days we shoul attain 75% of design
strength. Then your answer ; all the test cubes must attain
their 100% of design strength in 28 days. to ensure this
one we are taking test in 28 days .if cubes fail we have to
go for field test such as smith and hammer test or pulse
velosity (BS 12504 ).
Refer BS 1881 part 116
there are some factors to asses the test result
refer BS 6089
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