JUNIPER PUBLISHERS-Civil Engineering Research Journal
Soft Clay Treatment Using Geo-Foam Beads and Bypass Cement Dust
Authored by Mahmoud Samir
El-kady*
Soft clays are usually classified
according to their undrained shear strength, Cu. Values of Cu less than 12.5kPa
are associated with very soft clays, whereas, soft clays possess undrained
shear strength ranging between 12.5kPa and 25kPa. In addition to the low shear
strength of soft clays, they experience high compressibility upon loading. This
is why soft clays are considered as problematic for foundation purposes. Also,
Geo-foam is an industrial material, characterized by a very low unit weight
(average of 20kg/m3) compared to that of the soil. Having a density ranging
from 1.0% to 2.5% of that of soil EPS possesses a compressive strength ranging
between 70kPa and 140kPa and an elastic modulus ranging between 5MPa and 12MPa,
According to Horvath (1997). EPS Geo-foam blocks are used in a wide range of
geotechnical applications as a light weight fill.
So, the main objective of this study
is to investigate the geotechnical properties of soft clay with Geo-foam beads
and bypass cement dust. Also, investigate the possibility of preparing low
strength excavatable fill mixtures. For studying the effect of (Geo-foam beads
+ CBPD) / soft clay on fluid-state and hardened properties of new fill,
experimental work was carried out on two groups of mixture (A&B). Different
ratios of (Geo-foam beads + CBPD) were added to the mixture to study its effect
on flow consistency, dry unit weight, unconfined compressive strength, and
shear strength. The results of test conducted on the materials illustrated
that, cement bypass dust and excess foundry sand can be successfully used to
procedure self-compaction, self-leveling excavatable flowable fill material.
The unconfined compressive strength of the studied mixtures without Geo-foam
ranged between 271.8kPa and 1405.14kPa at CBPD between 3.88% and 18.63%. The
Cohesion values for group with Geo-foam with ranged between 50kPa and 20kPa at
Geo-foam between 0.32% and 1.35%. The friction angle of group with Geo-foam
with ranged between 10 and 22kPa at CBPD between 0.32% and 1.35%.
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