Study on utilization of fly ash in bitumen and in flexible pavements

Asphalt also known as bitumen, is a sticky, black and highly viscous liquid or semi-solid that is present in most crude petroleum's and in some natural deposits, it is a substance classed as a pitch. The primary use of asphalt is in road construction, where it is used as the glue or binder mixed with aggregate particles to create asphalt concrete. Its other main uses are for bituminous waterproofing products, including production of roofing felt and for sealing flat roofs. The terms asphalt and bitumen are often used interchangeably to mean both natural and (or asphalt cement) is the carefully effect on process of technically, economically satisfactory. Fly ash is one of the residues formed in combustion and consists of the fine particles that rise with the flue gases. It is a waste material and is dumped on the land. In India, 95 million tons of fly ash is generated every year which has occupied approximately 65,000 acres of land. Coal requirement and generation of fly ash estimated for the year 2031–2032 is around 1,800 million tons and 600 million tons respectively (MOST-2010). From the above figures, it is clear that there is huge amount of unused fly ash which has to be disposed of each year. Highway industry is capable manufactured forms of the substance. In American of using waste material in large quantities if their English, asphalt pavement performance proves to be refined residue from the distillation and environmentally selected crude oils. Fly ash has successfully been used asfiller for bitumen mixes for a long time and has the advantage of increasing the resistance of bitumen mixes to moisture damage. In addition to filling voids, fly ash was reported to have the ability to work as a bitumen extender.