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A and B are constants and A=96 N/mm2, B=7 (this is valid for the strength of concrete at the age of 28 days)
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Abrams’ law is a special case of a general rule formulated empirically by Feret:
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Punmia, Dr B. C.; Jain, Ashok Kumar; Jain, Arun Kr (2003-05-01).
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Abrams law, air and high water-to-cement ratios by ELSEVIER
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93:{\displaystyle S={\frac {A}{B^{w/c}}}}
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