Influence of Textile Effluent Waste Water on Compacted Lateritic Soil
F.O.P. Oriola1 and A. Saminu2
1Department of Civil Engrg., Nigerian Defense Academy, Kaduna, Nigeria.
Laboratory test was conducted on lateritic soil treated with various concentration of textile effluent waste water (0, 25, 50 and 100%) by dry weight of soil to assess its influence on the engineering properties of road pavement material. Specimens were compacted using the energies of the British Standard Light (BSL) and West African Standard (WAS) or “intermediate”. The laterite soil classified as A-7-6 or CL using the America Association of Highway and Transportation Officials (AASHTO) and Unified Soil Classification System (USCS), respectively. Natural soil treated with textile effluent waste water (TEWW) gave a peak 7 day UCS value of 875kN/m2 and 1033kN/m2 at 100% TEWW concentration at BSL and WAS energy level respectively. This values fall short of 1710 kN/m2 specified for base materials stabilization using OPC. However, this value meets the requirement of 687–1373 kN/m2 specified for sub-base materials. The peak resistance to loss in strength recorded for BSL and WAS were 25.3 and 26.8% (i.e. loss in strength) was attained at 0% TEWW concentration at both energy levels. This resistance to loss in strength values falls short of the acceptable conventional minimum of 80%. Finally, the strength and durability test conducted failed to meet the minimum specified values for base, sub-base and sub-base material.
Keywords: Textile Effluent Waste Water, Compaction, Durability, Unconfined Compressive Strength, California Bearing Ratio
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