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Concrete strength after 7 days is 20 ksi but after 28 days the strength goes down to 16 ksi why?

Concrete Civil Engineering
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Question added by farman wardag
Date Posted: 2015/11/30
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suhaib usmani
by suhaib usmani , Senior QA/QC Engineer , Qatar Building Company

Mostly it happens because of improper cube casting..  The whole scenario need to be investigated to come to a conclusion for such descrepancies

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