Journal Press India^®

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The development of new methodologies for manufacturing high performance concrete has led to massive increase in its usage worldwide. The higher strength development in concrete has increased the construction of skyscraper, bridges and special structures. Apart from higher strength and better performance the usage of this concrete also lends technical and economical viability to the entire project. The main criteria of making high strength concrete are to reduce the water content and increase the cement proportions. This however leads to reduced workability which can be overcome by the use of different mineral admixtures like rice husk ash, silica fume and fly ash apart from chemical admixtures. In our study, an attempt has been made to determine the effect of varying size of aggregate on high strength concrete using silica fume with and without fly ash. The concrete was manufactured using usual ingredients like cement, coarse aggregates, fine aggregates, water, and mineral admixture in the form of silica fume and fly ash and super plasticizer. Three sizes of coarse aggregates i.e, 10 mm, 12.5mm and 16mm with two types of fine aggregates with fineness modulus 2.65 and 2.88 were used in concrete. The percentage of silica fume and fly ash that replaced cement by weight was 7.5% and 10% respectively. It was concluded that concrete made from 10 mm coarse aggregate and with fine aggregate of fineness modulus 2.88 with silica fume showed higher compressive strength at 28 day curing.

Keywords

Coarse Aggregate; Compressive Strength; Sieve Analysis; Fineness Modulus.

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