shows that there is an exponential correlation between
the compressive strength of the cemented soil and the cement
dose. This means that at lower values of the studied
range of cement dosage rate an increase in the cement dosage
rate leads to a relatively small increase in the compressive
strength of the cemented soil, while at higher cement dosage
rate, a small increase in the utilized cement dosage rate increases
the compressive strength significantly. However, the
maximum cement dose utilized in this study is 440 kg/m3 because
it is believed that binder doses higher than 450 kg/m3,
which accounts for nearly 30% of the weight of the studied
soils, might not prove economical. According to Fig. 8, the
7-days unconfined compressive strength, qu, in MPa of the
hardened cement–soil prepared from the ‘‘Sh’’ soil can be related
to the cement dosage rate ‘‘CD’’ in kg/m3 by the following
equation: