*Research Scholar, Malla Reddy Engineering College(Autonomous) (MREC), Secunderabad, Telangana, India
**Asst. Prof, Malla Reddy Engineering College(Autonomous) (MREC), Secunderabad, Telangana, India
Online published on 27 February, 2018.
High Volume Fly ash Concrete (HVFC) consists more than 50% of Fly ash by weight in the Cement. This is an approach to maximize the Fly ash input in the concrete. The fall of strength belated rheology on account of Fly ash are counteracted through efficient control of water-cement ratio and effective role of super plasticizers. The HVFC so developed has all the attributes of high performance concrete. Viz, excellent mechanical properties, Low permeability and superior durability because of high input of Fly ash, the autogenous temperature is very much under control.
In the present work an attempt has been made to study the behaviour of high volume Fly ash concrete in compression and flexure. In the investigations, M20 and M30 Grade concrete mixes are designed at different percentages of Fly ash (0%, 20%, 40%, 60%, 80%) and tests are conducted for Compressive and Flexural Strengths at 7 and 28 days. Then the results are compared with normal concrete.
The study reveals that use of HVFC has a beneficial effect on the workability, the cost economy of concrete and Durability of the structure. Large quantities of energy replacement of cement results in energy savings since Fly ash does not need additional energy input before use. Larger the quantity of Fly ash replacement, the energy saved is proportionately more.
