The Stabilization of Expansive soil has a great importance now days and several methods and materials have been suggested for effective stabilization of these expansive soils, This analysis presents the stabilization of a local expansive soil using alkali activated fly ash. First the basic properties of black cotton soil are found out, the fly ash of different percentages such as 10, 20, 30, 40 and 50% are blended with black cotton soil and optimum dosage was found out, The activated fly ashes at different alkali concentrations 0, 0.5, 1, 1.5 and 2 molarities are used to perform tests. Different geotechnical properties like Atterberg’s limits, compaction, CBR and UCS of stabilized expansive soil were tested. It was observed that there is a considerable improvement in geotechnical properties of expansive soil with the addition of alkali activated fly ash and the results of alkali activated fly ash are found more suitable than normal fly ash mix.
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