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IJSTR >> Volume 9 - Issue 4, April 2020 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Mechanical Performance Of Sustainable Concrete Including Recycled Fine And Coarse Aggregate Improved By Silica Fume

[Full Text]



Hemin G. Ahmed, Khaleel H. Younis, Shelan M. Maruf



Silica fume, Recycled fine aggregates, recycled concrete, compressive strength, flexural strength.



In this investigational research, the performance of recycled aggregate concrete (RAC) has been tackled. The research studies the impact of the use of recycled fine and coarse aggregates on fresh and hardened properties of recycled aggregate concrete (RAC). Workability, compressive strength and flexural strength are examined in this paper. The effect of the use of silica fume (SF) as a method to enhance the behavior of RAC was studied. SF was used to replace the cement at contents (by mass) of 5%, 10% and 15%. Six mixtures were investigated. The mixtures made with recycled fine (RF) aggregate (at content of 50%) and natural coarse aggregate were four; these mixes made with 0%, 5%, 10%, 15% of silica fume. One mix was made with 50% RF aggregates and 100% recycled coarse aggregate. Also, a reference mix which includes natural fine and coarse aggregates was prepared for comparison purpose. It was concluded that using RF aggregates diminish the workability and strength of RAC. The use of SF decreases the workability of RAC though it enhances the compressive and flexural strength of RAC. If SF is used at contents within 10% to 15% of cement mass in RAC, its strength can be significantly enhanced.



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