EXPERIMENTAL STUDY ON SELF COMPACTING CONCRETE

Concrete is a mixture of cement, sand, gravel and water which dries hard and strong and is used as a material for building. Concrete has to be heavily vibrated for flow into very intricate forms or forms that have a lot of reinforcing bars. Hence to overcome these defects the self - compacting concrete is used. Self - compacting concrete is a flowing concrete mixture that is able to consolidate under its own weight. The self - compacting concrete flows easily at suitable speed into formwork without blocking through the reinforcement without being heavily vibrated. This project deals with the self - compacting concrete where the cement is partially replaced with fly - ash and silica fume. Here Ordinary Portland Cement is replaced with 5%, 10%, 15%, 20% and 25% of fly - ash and 2.5%, 5%, 7.5%, 10% and 12.5% of silica fume. From the experimental investigations, it is observed that there is in crease in the fresh properties (workability) and increase in the hardened properties (split - tensile strength and compressive strength) for replacement of sil ica fume. Similarly, there is increase in the fresh properties (workability) and decrease in the ha rdened properties (split - tensile strength and compressive strength) for replacement of fly ash