Abstract:
is experimental study explores the utilization of glass wastes mixed with kilned soil for weak soil improvement. Expansive soil
remains a reason for a lot of road and building damage through settlement and cyclic volume change. Replacing or stabilizing the
soil can minimize the risks associated with the soil type. Cement and lime have been the major stabilizers. However, the cost of
these materials is raised. Among many stabilizing materials, parts of the expansive soil burned and mixed with glass powder are
investigated to ful ll the major requirements. It is proved that the soil sample taken requires improvement. Parts of the soil kilned
and mixed with powdered glass waste have 75% of expansive soil kilned and 25% of glass waste powder, which are then added in
expansive soil with percentages of 5%, 15%, and 25% to test the change that occurred on liquid limit, plastic limit, free swell,
uncon ned compression, compaction, California bearing ratio (CBR), and mineral composition. Maximum dry density (MDD)
improved from 1.33 g/cm3 to 1.61 g/cm3
, optimum moisture content (OMC) reduced from 40% to 21.3%, plastic index reduced
from 58.79% to 19.91%, California bearing ratio (CBR) increased from 0.95% to 12.08%, and uncon ned compressive strength
(UCS) changed from 216 kPa to 910 kPa on 14 days of curing period. Similarly, the addition of 15% and 25% of the stabilizer
improved the free swell of expansive soil to 36% and 14%, respectively. CBR swell values signi cantly improved from 7.16% to
0.22%. Changes in mineral contents from X-ray di¢raction (XRD) test are observed: montmorillonite and illite minerals dis appeared, and the nonexpansive minerals are observed abundantly in stabilized soil. e addition of 15% to 25% of the stabilizer in
expansive soil improved the physical and chemical properties as to be in the appropriate range for road subgrade construction use.
