This research studies the effect of the addition of polypropylene
fibers (PF) on the properties of the swelling clayey soil. The effect
of PF on the shear strength of the clayey soil has been studied
and the results show that adding PF, up to spec
ific value,
increases the shear strength. Beyond this value of addition, the
shear strength decreases. The increase in shear strength was
about (100-110) % and the optimal addition ratio was determined.
The research aims to study the effect of soil content of gypsum on
the Engineering Characteristics and the usability of compression.
The effect of increasing the proportion of gypsum in the soil on the
Atrberg limits values was studied, and found
that an increase in
the proportion of gypsum in the soil reduces the Plasticity.
The effect of the gypsum content on the Swelling Capability for
soil was studied and found that the swelling ability reduces with
increasing the proportion of gypsum and the swelling pressure
value also decreases with increasing the soil content of gypsum.
It was studied The effect of mixing gypsum soil - cement on the
usability of compression, and found that the addition of cement to
the soil reduces the usability of compression.
