STUDY OF THE PROPERTIES OF HIGH STRENGTH CONCRETE WITH PARTIAL REPLACEMENT OF CEMENT WITH FLY ASH

Abstract

in concrete imparts several environmental benefits and thus it is eco- friendly. It saves the cement requirement for the same strength thus saving of raw materials such as limestone, coal etc required for manufacture of cement. Cement is a costly component of concrete. Even though, it is available without any scarcity, it involves high energy consumption for it‟s production. Hence, it is advisable to minimize the use of cement. However, concrete is a highly versatile construction material because of it’s strength, durability and mould ability. Therefore, it is highly worthful to search for an alternate material which can replace cement without compromising the quality of concrete. Fly ash is one such material which is considerably cementitious in nature. Therefore, the search of any other such material which can be used as an alternative to cement should lead to lowest possible environmental impact. The fly ash obtained by combustion of coal can be used as partial replacement for cement owing to its pozzolanic nature, which provides strength to cement. The huge quantity of fly ash being accumulated over the years is likely to pose a serious threat for its disposal and cause environmental problems. In this project, an effort has been made to determine the effect on strength characteristics of high strength concrete by partial replacement of cement with 0%, 10%, 20%, 30% and 40% of cement with fly ash for M30 and M40 grade of concrete. Test results indicate that workability and durability of concrete increases with increase in fly ash content. It has also been obtained that with increase in fly ash content, there is reduction in compressive strength of concrete. The optimum replacement of cement with fly ash is 30%.