Browsing by Author "Getnet, Meresa"

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    Stabilization of Expansive Subgrade Soils with Cement and Wood Ash
    (Addis Ababa University, 2021) Getnet, Meresa; Ephrem, Taddesse (PhD); Mastewal, Shumet (Mr.) Co-Advisor
    Expansive clay soils in their natural state are not adequate to be used as subgrade material in pavement road, hence they should be stabilized in order to improve strength and durability, improve workability and use of cost minimized locally available materials. The research was proceeded to evaluate the potential of cement-wood ash mix to stabilize expansive clay soil. The evaluation involved the determination of the geotechnical properties of Expansive soil in its natural state as well as when mixed with varying proportions of cement-wood ash additive. The parameters tested included the particle size distribution, specific gravity, Atterberg limits, compaction characteristics, California bearing ratio CBR, CBR swelling test, free swell and the unconfined compressive strength. Results showed that the geotechnical parameters of Expansive soil are improved substantially by the addition of cement-wood ash; plasticity was reduced by 27% and CBR and unconfined compressive strength increased as cement-wood ash addition increases and the values of CBR have increased from 1% to 24.3% while UCS values have increased from 161kpa to 450kpa. The results also showed that as the swelling potential values from CBR swelling test and free swell were found to be encouraging as CBR swell value of the expansive soil decreased from 13.1% to 2.43%. Hence, from the above mentioned results, it was concluded that the use of cement wood ash improves the engineering properties of expansive clay soil to a great extent.