EVALUATION OF CROSS BREED FIBRE-REINFORCED CONCRETE WITH OPTIMAL UTILIZATION OF TWO MINERAL ADMIXTURES
Keywords:
Hybridization, Steel fibres, Polypropylene fibres, Metakaolin, Fly ash.Abstract
The present investigation deals with the optimization of hybrid fibres in ternary blended concrete. Hybridization derives advantages from each of the fibre and reflects a synergetic response. Cement was replaced 30% by metakaolin and fly ash to produce a M40 grade of concrete based on I.S code method of mix design. Samples were prepared with and without metakaolin and fly ash by varying the fibres volume fraction from 0 to 1%. The present investigation focuses on to know the influence of steel and polypropylene fibre on the hardened properties of concrete, to do so the compressive, split tensile and flexural tests were conducted for 3,7,28 days of curing. The aim further extends to know the durability characteristics of this concrete. It was observed that with increase in steel fibre up to 0.75% and polypropylene fibre 0.25% showed greater results in terms of hardened properties. However the workability was reduced with the utilization of metakaolin and flyash as well as with the addition of steel and polypropylene fibres. Further, the concrete showed greater resistance against the acid which indicated the improved durability of the concrete.
