Stabilization of Clayey Soils Using Fly Ash and RBI Grade 81

For the development of developed country like India, roads play a very important role and have to be constructed in a minimum amount of time with sufficient economy. The increase in traffic is such that an adequate pavement is required which not only takes up the loads but can safely dispatch them to the soil underneath. Some situations may be encountered where the pavement may not possess the required strength to take up these loads and in such undesirable conditions we broadly have two solutions namely replacement and stabilization techniques. This paper describes the influence of RBI Grade 81 and fly ash on stabilization of poor clays by conducting compaction and CBR tests. RBI was used in varying percentages of 1, 3 and 5 whereas the percentages used for fly ash were 10, 20 and 30%. An increase in the value of OMC and decrease in the value of MDD was noticed on addition of fly ash and RBI to the poor soils. CBR value was experimented to be augmented with accelerating percentages of both the materials. An optimum combination of 75: 20: 5 (Soil: Fly ash: RBI) was found which was suitable for construction of sub base course for roads.