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Original Research

NJEAS. 2025; 3(1): 0-0


Impact of Millet Husk Ash and Groundnut Shell Ash on Black Cotton Soil – A Case Geotechnical Investigation in Bauchi, Nigeria

Muhammad Mustapha Musa,Akeem Gbenga Amuda,Abubakar Saidu Sambo.



Abstract
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Black cotton soil (BCS), prevalent in Bauchi, Nigeria, presents significant geotechnical challenges due to its high plasticity and swelling potential. This study investigates the impact of millet husk ash (MHA) and groundnut shell ash (GSA) —agricultural byproducts—as sustainable stabilizers for BCS. Laboratory tests including Atterberg limits, compaction, California Bearing Ratio (CBR), and Unconfined Compressive Strength (UCS) were conducted on untreated and treated soil samples. Results show that a mix of 4% MHA and 6% GSA significantly improves soil strength and reduces plasticity, offering a cost-effective and environmentally friendly alternative to conventional stabilizers. This approach supports sustainable construction and waste management practices in agricultural regions.

Key words: Black cotton soil, soil stabilization, millet husk ash, groundnut shell ash, sustainable construction

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