ABSTRACT

Self-compacting concrete principle is not new. Special applications such as underwater concreting have always required concrete, which could be placed without the need for compaction. In such circumstances vibration was simply impossible. Early self compacting concretes relied on very high contents of cement paste and, once super plasticizers became available, they were added in the concrete mixes. The mixes required specialized and well-controlled placing methods in order to avoid segregation, and the high contents of cement paste made them prone to shrinkage. The overall costs were very high and applications remained very limited.

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Compared to normally vibrated concrete (NVC), self-compacting concrete (SCC)

Possesses enhanced qualities and improves productivity and working conditions due to the elimination of compaction. SCC generally has higher powder content than NVC and thus it is necessary to replace some of the cement by additions to achieve an economical and durable concrete. Japan has used self-compacting concrete (SCC) in bridge, building and tunnel construction since the early1990’s. In the last five years, a number of SCC bridges have been constructed in Europe. In the United States, the application of SCC in highway bridge construction is very limited at this time. However, the U.S. precast concrete industry is beginning to apply the technology to architectural concrete. SCC has high potential for wider structural applications in highway bridge construction. The application of concrete without vibration in highway bridge construction is not new. In the present Study, Attempt has been made to compare the mechanical properties of self compacting and normal concrete specimens and. The criteria used were based on 7days, 28-day and 56 days compressive, splitting tensile and flexure strength and of conventional and self-compacting concrete for five Fly ash & Brick dust ratios as a replacement to fine

aggregate.