Desiccation Induced Shrinkage of Compacted Lateritic Soil Treated with Blast Furnace Slag |
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Authors: | Kolawole J Osinubi Adrian O Eberemu |
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Institution: | (1) Department of Civil Engineering, Ahmadu Bello University Zaria, Zaria, Nigeria |
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Abstract: | A reddish brown lateritic soil treated with up to 15% blast furnace slag was compacted with three compactive efforts, (standard
Proctor, West African Standard and modified Proctor) with moulding water contents ranging between 10 and 20% of weight of
dry mixture. Compacted samples were extruded and allowed to dry in the laboratory for 30 days with measurements taken every
5 days to monitor volumetric changes due to drying. Four specimens compacted on the wet side of optimum using standard proctor
effort; at the various slag treatments after 10 days of drying were subjected to four cycles of drying and three cycles of
wetting. The results obtained showed that the changes in mass and volumetric shrinkage were rapid within the first 5 days
of drying. These changes were proportional to the moulding water contents and were unaffected by the compactive effort. The
volumetric shrinkage strain increased with increasing moulding water content and compactive efforts. As the water content
relative to the optimum increased towards the wet side, the volumetric shrinkage strain increased and it decreased towards
the dry side. For all compaction energies, the initial degree of saturation increased and regardless of the slag content,
the volumetric shrinkage strain increased. As the slag content increased, the initial degree of saturation at which the permissible
4% volumetric shrinkage occurred increased. Slag content had marginal effects on the volumetric shrinkage strain as no clear
trend was established. For each slag treatment the volumetric shrinkage strain did not vary significantly with increasing
number of drying cycles. |
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