Hydraulic Conductivity of Compacted Lateritic Soil Treated with Blast Furnace Slag


Kolawole J. Osinubi

Associate Professor, Dept. of Civil Engineering, Ahmadu Bello Univ., Zaria, Nigeria kosinubi@yahoo.com

Adrian O Eberemu

Research Assistant, Dept. of Civil Engineering A.B.U. Zaria, Nigeria


Hydraulic conductivity tests were conducted on four compacted lateritic soil treated with up to 15% in stepped increment of slag content by weight of dry soil. The lateritic soil-slag mixtures were prepared at various moulding water contents, compacted and permeated in the laboratory. The hydraulic behaviour of the soil-slag mixtures were examined in which the effects of moulding water content, water content relative to optimum, initial degree of saturation at compaction, slag content and the Atterberg limits were investigated. The result of the tests showed that in a manner similar to natural soils, the hydraulic conductivity decreased with higher moulding water content. The hydraulic conductivity decreased on the wet side and increased on the dry side of the line of optimum for all compactive efforts used and slag content of the mixtures. Hydraulic conductivity decreased with higher slag content. The initial degree of saturation increased as the hydraulic conductivity decreased, but further increase in initial degree of saturation did not result in decrease in hydraulic conductivity values.

Keywords: Atterberg limits, Blast furnace Slag, Hydraulic Conductivity, Initial Degree of Saturation, Lateritic Soil.

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