The ability of Abram’s law for predicting strength of claycement-
fly ash mixtures was also studied. The concept of Abram
1918 described that the strength of concrete depends on watercement
ratio with an exponential function, the equation is presented
in Eq. 8. Horpibulsuk et al. 2003 and Lorenzo 2005
used this concept for predicting the unconfined compressive
strength of cement-admixed clay. In this part, Abram’s law, in