Geotechnical Engineering

Permanent URI for this collection

http://etd.aau.edu.et/handle/12345678/135

Browse

Browsing Geotechnical Engineering by Author "Adey, Girma"

Now showing 1 - 1 of 1
  • No Thumbnail Available
    Item
    Stabilization of Expansive Soil Used as Subgrade Material Using Cement Kiln Dust
    (Addis Ababa University, 2017-09) Adey, Girma; Alemayehu, Teffera (Prof.)
    Expansive soils are worldwide problems that pose several challenges to civil engineers. Such soils swell when given access to water and shrink when they dry out. The most common and economical method for stabilizing these soils is using admixtures that reduce volume changes. This research work is aimed at evaluating the suitability of cement kiln dust for stabilization of expansive clay soils. The preliminary investigated expansive soil shows that it belongs to A-7-5 class of soil according to the AASHTO soil classification system. Soils under this class are generally of poor engineering benefit. The soil was stabilized with cement kiln dust with the proportions of 5%, 10%, 15%, 20%, 25% and 30% by dry weight of the soil. Atterberg limits, free swell, swell –pressure, compaction, UCS, linear shrinkage and CBR tests were conducted to evaluate the properties of the stabilized soil. All stabilized soil samples were cured for 7 days for Atterberg limit and compaction tests. For CBR test, the samples were cured for 7, 14 and 28 days. For UCS test, however curing was done for 7 and 14 days. Analysis of the results shows that slight improvement was achieved on the geotechnical properties of the cement kiln dust stabilized soil. Cement kiln dust reduces the plasticity index, swelling and MDD with increase in OMC and CBR with all higher cement kiln dust contents. Curing has significant effect on the geotechnical properties of cement kiln dust stabilized soil.