Improvement of Strength Properties of Black Cotton Soil Using Corn Cob Ash and Cement Kiln Dust for use as Base Materials

Sani E. J., Moses G., Adoga E. J., Mustapha K. K.

Abstract


The preliminary investigation of the black cotton soil (BCS) collected from Deba Local Government Area of Gombe State, shows that it belongs to A-7-6 or CH in AASHTO and Unified Soil Classification System (USCS), respectively. Soils under these groups are usually very poor for engineering use. The soil was treated with cement kiln dust (CKD) – corn cob ash (CCA) blend in stepped concentration of 0, 2, 4, 6 and 8 as well as 0, 2, 4, 6, and 8, for CKD and CCA, respectively by dry weight of soil. Compaction was carried out using British Standard Heavy (BSH). The liquid limit decreased from 57.8% for the natural soil to 49.2%, while the plastic limit decreased from 19.16% for the natural soil to 14.65% at 6% CKD/6% CCA treatment. Unconfined compressive strength (UCS) values of 1037.18kN/m2 recorded for the natural soil increased to 1807.55kN/m2 at 6% CKD/6% CCA for specimens compacted and cured under 7 days. The California bearing ratio (CBR) values (unsoaked condition) of the compacted natural soil increased from 15% to 89% when treated with 6% CKD/6% CCA. For the 24-hour soaked condition,n the CBR values obtained increase from 10%-31%. The 6% CKD/8% CCA blend attained 66.85% resistance to loss in strength. Statistical analysis of the results showed that improvements in the soil characteristics can be attributed to the CKD/CCA treatment with more significant effects upon addition of CCA. The results recorded shows that stabilization with CKD/CCA blend significantly improved the strength properties of the Black Cotton Soil to be used as a base material in highway construction.


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References


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