High Volume Fly Ash Concrete

Abstract

India is still a developing country and for development of any country electricity is considered as a major source. For production of electricity in India mostly coal is used, and as a waste product of coal based thermal power plants mostly tapped,a huge amount of fly ash results. Fly ash is a fine and waste material resulting from combustion of coal. Disposal of fly ash is a big problem; requires millions of acres land for its dumping. Because of this environment is also highly polluted.Fortunately, the fly ash has certain important advantages such as cementitious products,which can pave way for its utilisation in bulk for replacement of cement in concrete pavement, which can be a more sustainable and economical means of disposing and utilising for a better cause. Thus, the use of fly ash in concrete is promoted not only from environmental consideration but also from economizing construction cost.
Now-a-days, because of increase in construction activities, the demand for cement also increase. So to avoid production of greenhouse gases and to produce environment friendly concrete, certain percentage of cement in concrete mix is replaced by fly ash without sacrificing strength and achieving durability and economy in construction work. However, fly ashes from different sources have different properties, thus affecting the performance of concrete. Hence it is quite necessary to understand the behaviour of concrete with fly ashes collected from different sources to get an overall idea of application of fly ash in concrete pavement. It is therefore necessary to develop the mix design for the Pavement quality concrete made with different fly ashes and study their performance characteristics such as compressive strength,workability, flexural strength,fatigue characteristics etc. The optimum quantity of fly ash is to be determined based on the above basic characteristics.