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Predicting 28 Day Strength From 7 Day Cylinder Breaks

Non-linear models for the prediction of specified design strengths of concretes development profile ... As the concrete mixes were designed based on the 28-day strength, the strength increasing ratio was taken 1 at 28-day concrete age. ... The cylinder test results showed that concrete strength at 28 day was 1.45–1.5 times of the 7 day age ...

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