Stabilization of soil subgrade by using bottom ash

Waste materials used in construction practices are common now days. These methods are found to be improving engineering properties of materials with which they are used and also to provide a more nature and economic friendly process of construction. There has been very much working done on usage of waste plastic and fly ash in road construction. Almost all studies have accepted that these otherwise waste materials can be used in construction of rigid and flexible pavements up to a certain extent.In this study for stabilization of subgrade soil, Bottom Ash is used. Bottom ash is basically a coal combustion product that is produced along with fly ash in coal fired thermal power plants.Around 10 to 15% of total ash generated in these power plants is bottom ash. Bottom ash is similar to fly ash having grey to black color and particle coarser than fly ash. It is generated in bottom of boilers and collected in hopper so that it is called Bottom Ash.