Self-Compacting Concrete Reinforced with Steel Fibers from Scrap Tires: Rheological and Mechanical Properties

Authors: Khaleel H. Younis1 & Fatima S. Ahmed2 & Khalid B. Najim3
1Erbil Polytechnic University (EPU), Erbil, Iraq
2&3University of Anbar, Anbar, Iraq
1Ishik University, Erbil, Iraq
1Knowledge University, Erbil, Iraq

Abstract:  The aim of this study is to evaluate the rheological behavior and the mechanical performance of SCC with different contents and lengths of recycled steel fiber (RSF) recovered from scrap tires. The rheological properties investigated in this study include: slump flow, J-ring, L-box, and V-funnel tests. The mechanical properties include: compressive and flexural strength. The parameters of the study are fiber content and length. In total, thirteen self-compacting concrete (SCC) mixtures were prepared. Three fibers contents 30, 60 and 90 kg/m3 were investigated and for each fiber contents Wf, four mixes were prepared with four different fiber lengths (Lf) (10, 15, 25, 35 mm). A control mix (plain SCC) was also prepared for comparison reasons. The results showed that the addition of RSF decreased the slump flow, slowed down the flow rate and increased the V-funnel time but maintained the requirement of SCC up to 60 kg/m3 fiber content. Shorter fibers had less effect on the rheological behavior of SCC than long fibers. Both RSF content and length affected the compressive strength and the flexural strength of SCC. Long RSF reduced compressive strength but increased the flexural strength.

Keywords: Recycled Steel Fiber, SCC, Rheological Properties, Compressive Strength, Flexural Strength

Download the PDF Document from here.


doi: 10.23918/eajse.v4i1sip1


References

BS EN 12390-3 (2009). Testing hardened concrete Part 3: Compressive strength of test specimens. British Standard Institution, London, UK.

BS EN 12390-5 (2009). Testing hardened concrete Part 5: Flexural strength of test specimens.British Standard Institution, London, UK.

Centonze, G., Leone, M., & Aiello, M. (2012). Steel fibers from waste tires as reinforcement in concrete: A mechanical characterization. Construction and Building Materials, 36, 46-57.

EFNARC (2005). The European Guidelines for self-compacting concrete: specification, production, and use. Retrieved from  http://www.efnarc.org/

El-Dieb, A.S., & Taha, M.R. (2012). Flow characteristics and acceptance criteria of fiber-reinforced self-compacting concrete (FR-SCC). Construction and Building Materials, 27.

Gencel, O. (2011). Workability and mechanical performance of steel fiber-reinforced self-compacting concrete with fly ash. Composite Interfaces, 18(2), 169-184.

IQS No. 45/1984. Iraqi specification for aggregate.

Khayat, K., & Roussel, Y. (2000). Testing and performance of fiber-reinforced, self-consolidating concrete. Materials and Structures, 33(6), 391-397.

Madandoust, R. (2015). Assessment of factors influencing mechanical properties of steel fiber reinforced self-compacting concrete. Materials & Design, 83, 284-294.

Pilakoutas, K., Neocleous, K., & Tlemat, H., (2004). Reuse of steel fibres as concrete    reinforcement. Engineering Sustainability, 157, 131-138.

Thomas, B.S., & Gupta, R. (2016a). Properties of high strength concrete containing scrap tire rubber. Journal of Cleaner Production, 113, 86-92.

Thomas, B.S., & Gupta, R. (2016b). A comprehensive review on the applications of waste tire rubber in cement concrete. Renewable and Sustainable Energy Reviews, 54, 1323-1333.

Tlemat, H. (2004).  Steel fibres from waste tyres to concrete: testing, modelling and design. PhD. Dissertation, The University of Sheffield, UK.

Younis, K. H. (2016). Mechanical perfromance of concrete reinforced with recycled steel fibres extracted from post-consumer tyres)” Proceedings of the 2nd International Engineering Conference on Developments in Civil Engineering and Computer Applications (2nd IEC2016) 20 – 22 February,  Erbil-Kurdistan-Iraq.

Younis, K. H., & Pilakoutas, K. (2013). Strength prediction model and methods for improving recycled aggregate concrete. Construction and Building Materials, 49, 688-701.