Fly ash is a by-product of coal combustion in thermal plants. Presently majority of the coal ash generated is being handled in wet form and disposed off in ash ponds which is harmful for the environment and moreover ash remains unutilized for gainful applications.
India has sufficient coal reserves. In India almost 65-70% of electricity production isdependent on coal which produces a huge quantity of Fly Ash as residue which is allegedly a waste product in Thermal Power Stations.
Fly Ash has a vast potential for use in High Volume fly ash concrete especially due to its physic-chemical properties. Using fly ash in construction activity is environment friendly, reduce energy demand and restrict carbon emissions.
Transco Delhi and DMRC have been using flyash in construction activities.
When mixed with lime and water the flyash forms a cementitious compound with properties very similar to that ofPortland cement. Because of this similarity, fly ash can be used to replace aportion of cement in the concrete, providing some distinct quality
advantages.The concrete is denser resulting in a tighter, smoother surface with lessbleeding.
A good amount of research has already been done inIndia and abroad on its strength and other requisite parameters.