International Journal of Scientific & Technology Research

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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.



[1] Mehta KP, Monteiro PJM. Concrete structure, properties, and materials 1993.
[2] Younis KH, Latif S. Mechanical performance of self-compacting concrete incorporating recycled aggregate: A review. Int J Sci Technol Res 2019;8:560–7.
[3] Salahuddin H, Qureshi LA, Nawaz A, Raza SS. Effect of recycled fine aggregates on performance of Reactive Powder Concrete. Constr Build Mater 2020;243. doi:10.1016/j.conbuildmat.2020.118223.
[4] Younis KH. Restrained Shrinkage Behaviour of Concrete with Recycled Materials. The University of Sheffield, 2014. doi:http://etheses.whiterose.ac.uk/id/eprint/5966.
[5] Younis KH, Mustafa SM. Feasibility of Using Nanoparticles of SiO 2 to Improve the Performance of Recycled Aggregate Concrete. Adv Mater Sci Eng 2018;2018:1–11. doi:10.1155/2018/1512830.
[6] Tam VWY, Tam CM. Diversifying two-stage mixing approach (TSMA) for recycled aggregate concrete: TSMAs and TSMAsc. Constr Build Mater 2008;22:2068–77. doi:10.1016/j.conbuildmat.2007.07.024.
[7] Younis KH. Nano-Silica Modified Recycled Aggregate Concrete: Mechanical Properties and Microstructure. Eurasian J Sci Eng 2018;3:167. doi:doi: 10.23918/eajse.v3i3p167.
[8] Younis KH, Pilakoutas K. Strength prediction model and methods for improving recycled aggregate concrete. Constr Build Mater 2013;49:688–701. doi:10.1016/J.CONBUILDMAT.2013.09.003.
[9] de Brito J, Saikia N. Recycled Aggregate in Concrete. London: Springer London; 2013. doi:10.1007/978-1-4471-4540-0.
[10] Younis KH, Pilakoutas K, Guadagnini M, Angelakopoulos H. Feasibility of using recycled steel fibres to enhance the behaviour of recycled aggregate concrete. Am. Concr. Institute, ACI Spec. Publ., vol. 2014- July, 2014, p. 113–22.
[11] Tabsh SW, Abdelfatah AS. Influence of recycled concrete aggregates on strength properties of concrete. Constr Build Mater 2009;23:1163–7. doi:10.1016/j.conbuildmat.2008.06.007.
[12] Tam VWY, Soomro M, Evangelista ACJ. A review of recycled aggregate in concrete applications (2000–2017). Constr Build Mater 2018;172:272–92. doi:10.1016/J.CONBUILDMAT.2018.03.240.
[13] British Standard EN BS12350-2. Testing fresh concrete: Part 2: Slump-test 2009.
[14] British Standard 12390-3. BSI Testing hardened concrete Part 3: Compressive strength of test specimens. London; UK: British Standard Institution; 2009.
[15] British Standards Institution BSI EN B 12390-5. Testing hardened concrete–Part 5: flexural strength of test specimens. 2009.
[16] Tam VWY, Wang K, Tam CM. Assessing relationships among properties of demolished concrete, recycled aggregate and recycled aggregate concrete using regression analysis. J Hazard Mater 2008;152:703–14. doi:10.1016/j.jhazmat.2007.07.061.
[17] Xie J, Fang C, Lu Z, Li Z, Li L. Effects of the addition of silica fume and rubber particles on the compressive behaviour of recycled aggregate concrete with steel fibres. J Clean Prod 2018;197. doi:10.1016/j.jclepro.2018.06.237.