EXPERIMENTAL STUDIES ON SCC WITH RECYCLED AGGREGATE AND FLY ASH

Revathi Purushothaman, Kavitha.P, Senthamilselvi.R

Abstract: Self-compacting concrete (SCC) is a new type of concrete which can be placed in every corner of formwork under its weight without any segregation. On the other hand, the cost of SCC is high due to its expensive ingredients such as mineral and chemical admixtures and cement. Hence, with the aim of reducing the production cost of SCC ,without sacrificing on its strength and durability performances, the authors have attempted to produce by SCC incorporating the waste materials such recycled aggregate (RA) and fly ash (FA). In this study RA as coase aggregate and FA are used, in the production of SCC in varying percentage replacements. The natural coarse aggregate (NA) are replaced at 0, 50, and 100% by volume replacements of RA .FA are used in proportions of 0, 20, 40 and 60 % by volume of cement. The experimental program of the study consisted of twelve concrete mixes which reflect the key variables and their effects on the fresh and mechanical properties of the produced SCC. The test results for acceptance characteristics of SCC such as slump flow, J-Ring , V-funnel and L-Box are presented. Further, the compressive strength at the ages of 7, 28 and 56 days was also determined and results are presented. The obtained results in all of the studied mixes indicate that the performance of SCC produced with RA and FA are comparable with that produced with natural aggregate. It is also found that the strength variations are within 10% for SCC produced with RA

Keywords: Self compacting concrete, Recycled aggregate, Fly ash, Natural aggregate, Fresh properties, and Compressive strength.

DOI: https://doi.org/10.15623/ijret.2016.0532048