10-11-2014, 01:49 PM
Abstracts: The main objective of this work was to study the effects of partial replacement of cement by fly ash. Because in recent era the use of cement is large and the cost of cement is more therefore when we replace the cement to fly ash it will be economical. The use of fly ash in concrete at different proportions of total cementations binder has been studied extensively over many years and the properties of fly ash based concrete are well documented. The replacement of fly ash as a cementations component in concrete depends upon the design strength, water demand and relative cost of ash compared to cement. This study shows the strength properties of fly ash concrete compared to normal concrete. Ordinary Portland cement was replaced with fly ash from 0 to 45% in steps of 0%, 5%, 10%, 15%, 30%, and 45% by weight, mix proportioning was based on grade concrete (M20). The replacement of cement by fly ash up to 10% increases strength while decreases workability in terms of slump. If plasticizers would have been used strength and workability could have been increased. So it is practically possible to replace cement by fly ash up to 15% using plasticizers. Use of fly ash more than 15% is practically not possible because it reduces workability as well as strength of concrete.