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Evaluation of Strength Characteristics of Tropical Black Clay Treated with Locust Bean Waste Ash

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Abstract

An expansive tropical black clay (also known as black cotton soil because the cotton plant thrives well on it) was treated with up to 15 % locust bean waste ash (LBWA) to assess its soil improvement potential. Samples were subjected to index, compaction using three energy levels (British Standard light, BSL, West African Standard, WAS or ‘Intermediate’ and British Standard heavy, BSH), shear strength (unconfined compressive strength, UCS), California bearing ratio, CBR and durability tests. Results obtained show that the natural soil is not suitable for road construction. The maximum dry density (MDD) and optimum moisture content (OMC) decreased and increased, respectively. Regardless of the compactive effort and curing period, strength and durability properties increased with higher LBWA content with the BSL effort recording the best improvement. However, based on durability results, the optimal 12.5 % LBWA treatment of black cotton soil did not satisfy criteria for its use in road construction as a stand alone additive. Also, significant improvement in soil properties was obtained using the BSL compactive effort, which is easily achieved in the field. The benefits of the application include reduction in the cost of soil improvement and the adverse environmental impact of locust bean waste.

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Correspondence to Adrian O. Eberemu.

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Osinubi, K.J., Eberemu, A.O. & Akinmade, O.B. Evaluation of Strength Characteristics of Tropical Black Clay Treated with Locust Bean Waste Ash. Geotech Geol Eng 34, 635–646 (2016). https://doi.org/10.1007/s10706-015-9972-7

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