This paper discusses the results pertinent to fly ash treated three expansive soils collected from different places in AP state, India. The test results such as Atterberg limits, Compaction, Unconfined compression stress (UCS), California Bearing Ratio (CBR) and Swelling properties obtained in the laboratory were discussed and presented. From the results, it is noticed that the plasticity and swelling characteristics of three expansive soils treated with fly ash reduced drastically and not much improvement is noticed in the UCS. Overall the results showed encouraging trend towards use of fly ash treated expansive soils in the construction.
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