Because soft clays have a greater tendency to swell and shrink, structures constructed on them face the danger of suffering uneven settlement, which may result in structural damage. Numerous attempts have been made to stabilise the soil by the mean of mechanical and chemical stabilization. In recent years, several researchers intended to change the geotechnical characteristics of problematic soils with the help of Nano-additives such as Nano-silica, Nano-clay, Nano-lime, Nano-carbons. This study is focused on summarising the change in strength, mineralogical and morphological behaviour of soil with the incorporation of Nano-silica and Nano-silica-based compounds reported by researchers. It was observed that strength of soil improved drastically with the addition of Nano-silica and Nano-silica-based compounds up to optimum dosages. The inclusion of Nano-silica densifies soil due to the filling effect, formation of better interparticle bond and pozzolanic products. From the detailed review of literature, it can be concluded that it is advantageous to incorporate Nano-silica and Nano-silica-based compounds to improve the geotechnical properties of problematic soils.
