Abrams' law

Abrams' law (also called Abrams' water-cement ratio law)^[1] is a concept in civil engineering. The law states the strength of a concrete mix is inversely related to the mass ratio of water to cement.^[1]^[2] As the water content increases, the strength of concrete decreases.

Abrams’ law is a special case of a general rule formulated empirically by Feret:

S={\frac {A}{B^{w/c}}}

where

S is the strength of concrete

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)

w/c is the water–cement ratio, which varies from 0.3 to 1.20

References

^ ^a ^b Punmia, Dr B. C.; Jain, Ashok Kumar; Jain, Arun Kr (2003-05-01). Basic Civil Engineering. Firewall Media. ISBN 9788170084037.
^ Scott, John S. (1992-10-31). Dictionary Of Civil Engineering. Springer Science & Business Media. ISBN 9780412984211.

^[1]

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^ Abrams law, air and high water-to-cement ratios by ELSEVIER

[:0-1] Punmia, Dr B. C.; Jain, Ashok Kumar; Jain, Arun Kr (2003-05-01). Basic Civil Engineering. Firewall Media. ISBN 9788170084037.

[2] Scott, John S. (1992-10-31). Dictionary Of Civil Engineering. Springer Science & Business Media. ISBN 9780412984211.

[3] Abrams law, air and high water-to-cement ratios by ELSEVIER

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