Compressibility characteristics of saline soils treated with
Firas A. Salman1*, Dunya K.
Sabre2 and Namir K. S. Al-Saoudi2
of Civil Engineering, University of Malaya, 50603 Kuala
and Construction Engineering Department, University of
Technology, Baghdad, Iraq.
*Corresponding author. E-mail:
Accepted 9 August, 2011.
This study investigates the possibility of using high
sulphate resisting cement as an additive to control the
compressibility behavior of two saline soils sourced brought
from Baghdad and Basra governorates in Iraq. The two soils
are similar in their constituents, and classified as CL
according to Atterberg limit. Standard consolidation samples
were prepared from untreated soils, and were treated with 3,
5, 7, and 10% cement by weight and cured for 7, 14, and 21
days. The soil samples were then socked in water and
standard consolidation tests were performed on them.
Chemical and mineralogical analyses were also carried out
before and after the different treatments. The tests results
revealed that high sulphate resisting cement successfully
influenced the compressibility behavior of both soils. It
was observed that the curing period played a major role in
reducing the compressibility. Our results also showed that
14 days curing was sufficient for the completion of the
major reactions between the cement and the saline soil. The
addition of 3% cement by weight to both soils was sufficient
to reduce the compression index, Cc, by
about 50 to 60% after of 7 days curing. In general both
soils exhibited further decrease in the compression index
with increasing cement content and curing period. The
reduction in compressibility of the treated soils was also
accompanied by substantial increase in the modulus of
Compressibility, saline soil, sulphate resisting cement,
cement treatment, Iraq.