The use of stabilized fly ash as a green material in pavement substructure: A review

Fly ash is a waste produced in coal-fired thermal power stations. It has pozzolanic properties and can therefore be stabilized to achieve higher strength and durability required for use as pavement substructure specifically as subbase or base layer material. The stabilization of fly ash can be achieved by adding either cement, lime or other materials. Stabilization of fly ash with available industrial by-products is also possible and is gaining researchers’ attention now a day. Considerable economic as well as environmental benefits can be achieved when bulk amount of fly ash is utilized along with other potential waste materials. Hence a comprehensive study has been done to review the various ways of stabilizing fly ash for higher strength and durability for its extensive use in pavement sector. The paper therefore presents a comprehensive review of available literature on attempts at beneficial reuses of stabilized fly ash (FA) in subbase/base layer of pavement. Keyword: Fly ash, pozzolanic properties, stabilization.