STRENGTH PARAMETERS OF STABILISED FLYASH

Abstract

There has been impressive increase in the power generation in India from a low capacity of 1362 MW in 1947 to about 10,154 in 2001 out of which about 6500 MW is from coal based power stations. With increasing reaction from environmental groups against construction of large dams and serious concerns for safety as far as nuclear power is concerned, the thermal power is the major source of electric power in India. The Indian coal has high ash content (35 — 45%) and low calorific value (3500 — 4000 K cal/kg). About 75 MT of ash per year is presently being produced in India which may reach a staggering figure of about 200 MT/ year by the year 2012. This huge quantity of ash requires a large amount of area for its disposal, causing nuisance to environment. The present study is to investigate the changes in the strength parameters of Flyash when stabilised with Solani river sand. It is a deviation from the conventional practice of stabilizing Flyash with lime, cement and other foreign materials, which are too costly. It has been observed that there is a substantial increase in strength parameters C, 'V and CBR values with the increase in proportion of sand. It was found that on addition of 40 % sand to Flyash means its behaviour similar to sand, which means about 60% of sand can be replaced by Flyash and looking at its behaviour it is concluded that the Flyash can be successfully utilized as a construction material.