Value of Admixture in Concrete Mix Design

Despite its few inherent shortcomings, concrete has proved to be the most widely used construction material, no substitute in time still to come. In the present investigation, study of admixture of concrete was carried out. The strength of concrete depends on its mix proportions. We used so many admixture e.g. ‘silica. Fumes, fly ash etc , when we used these type of admixture the result was very good. Admixture also increases the various properties of concrete like workability, compressive strength, consistency etc. By the use of this admixture, with the passage of time, the hydration of cement approaches to a higher degree, thus improving the strength of concrete. So, as the age of concrete increases, strength of concrete increases. The percent inclusion of fly ash, silica fume and fly ash plus silica fume by weight of cement and types of aggregate were the main parameters of the study. The advantage of HSC is small cross-section of structural elements resulting into reduction in cost and use of more space and improved engineering properties. The contents of silica fume and fly ash were varied from 5 to 15% when used individually and 10 to 20% when used collectively. The water to cement plus binder materials ratio was varied from 0.35 to 0.39. In order to maintain a desired degree of workability of concrete, expressed in terms of compaction.