Geotechnical Properties of Flyash Used in Construction of Road Embankment

摘要

Increased demand for electricity caused an increased in production of flyash. It has been considered as hazardous waste. At present, about 85 thermal power stations produce nearly 118 million tonne of coal ash per annum and it is estimated that the coal ash production will reach 175 million tonne by 2012 and may exceed 225 million tonne by 2017.The solution to this problem (high amount of ash production) lies in gainful utilisation of flyash. The flyash can be utilized in bulk only for engineering purposes, such as construction of dams, embankments, airport runways, highways, building materials and civil construction. The consistency and abundance of flyash in many areas present unique opportunities for use in road embankments. The purpose of this paper is to review the geotechnical properties of the flyash and the construction methods that have been considered in road embankment.