Authors : Murtala Umar and Hashim Mohammed Alhassan
Abstract: Two laterites samples known for their deficiency in road construction were used to assess the efficacy of Class-C fly ash in improving their engineering properties. The two samples were taken from Danbare and Dausayi localities within Kano Metropolis and the fly ash was sourced from the Nigerian Coal Corporation, Enugu. Preliminary tests on the two samples confirmed their deficiency for use in road construction. The processed fly ash was blended with the laterite samples at 0, 3, 6, 9, 12, 15 and 18%. Hence, the treated soil samples were tested for plasticity, compaction and strength properties. Results obtained revealed reduction in plasticity properties as the fly ash contents increases. Similarly, Maximum Dry Density (MDD) decreases as the fly ash content increases while the Optimum Moisture Content (OMC) of the treated soils increased respectively for the two samples. The treated soil sample shows reasonable increment in the strength properties higher than the natural soils. Peak CBR values of 16 and 35% were obtained at 9 and 15% fly ash contents for samples 1 and 2, respectively. The unconfined compression tests showed considerable improvement in strength properties higher than the values of the natural soils. The peak 7 days strength of 630 and 1410 kN mG2 were observed at 12 and 15% fly ash content for samples 1 and 2, respectively.
Murtala Umar and Hashim Mohammed Alhassan, 2020. Efficacy of Class-C Fly Ash as a Stabilizer for Marginal Laterites. Journal of Engineering and Applied Sciences, 15: 2894-2899.