Use of Cement Stabilized Fly Ash in Pavement

Abstract

Fly ash is one of the main by-products of all power generating and steel plants here in India. These waste by-products are generally toxic in nature that can have bad ecological results. Disposal of these waste products costs money and manpower. The only way to tackle this situation is by utilizing these by-products in engineering works. In India, the scarcity of good quality aggregates at construction sites has forced the researchers to utilize waste products & by-products of power plants in the construction of road subbase/base layer. The main objective of this study is to utilize different class F FA as base/subbase material in road pavements. Since class F FA do not have attractive designing properties for this purpose, it was chosen to settle the FA with varying percentages of cement. FA can be utilized with or without aggregates as a pavement layer, but in our study aggregates are not used. In this study, only aggregate free stabilized mixtures (FA and cement only) were to be used since our aim was to replace the use of conventional aggregate in subbase/base layer due to its scarcity nowadays. Using seven different FA from local sources and by varying cement content by total weight of FA, laboratory samples were prepared and various tests like CBR test, UCS test and flexural strength test were conducted to check whether it can replace the conventional aggregate mix in base/sub-base layer or not.