# 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:

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

where

S is the strength of concrete
A and B are constants
w/c is the water–cement ratio, which varies from 0.3 to 1.20

## References

1. ^ a b 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.

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