Volume 22, Issue 57, January - June, 2025

Flexural behavior of reinforced concrete beams containing hybrid fiber and recycled tire rubber

Noha Zaki^1♦, Ayman Khalil², Mohamed Said³, Mohamed Makhlouf⁴

¹PH.D Student, Department of Structural Engineering, Faculty of Engineering, Ain Shams University, Cairo, Egypt
²Head of Structural Engineering Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt
³Professor, Structural Engineering Department, Faculty of Engineering (Shoubra), Benha University, Cairo, Egypt
⁴Professor, Department of Civil Engineering, Faculty of Engineering at Benha, Benha University, Egypt

^♦Corresponding author
PH.D Student, Department of Structural Engineering, Faculty of Engineering, Ain Shams University, Cairo, Egypt

ABSTRACT

One of the main goals of sustainable waste management is to maximize recycling and reuse. Environmental sustainability and trash management are aided by the reuse of tire rubber waste, such as crumb rubber (CR), as aggregate in concrete. On the other hand, mechanical characteristics are significantly reduced by integrating (CR). In this study, rubber concrete reinforced with polyvinyl alcohol fiber (PVA), polypropylene fibers (PP), and steel fiber (SF) were used to improve the flexural behavior of concrete beams. The concrete mix contains crumb rubber 10% and 20% (1-2 mm in size) by volume as a substitute for fine aggregate. The bonding efficiency of crumb rubber and concrete was analyzed by testing the compressive strength and studying the flexural behavior of beams with different contents of crumb rubber and other types of fibers added to the mixtures used to enhance the properties of the beams. The ductility index properties of the produced beams have been investigated as well. The experimental results indicated an improvement in the strength of the produced beams after reinforcing them with fibers. The concrete mix with hybrid fibers (0.5% PP + 0.5% SF) and 10% (CR) had higher ultimate strength of 95.43 kN compared to other concrete mixes containing (CR). The concrete mixture with 20% crumb rubber had the highest ductility index measuring 4.75. A successful combination of (CR) and hybrid fibers was achieved when replacing the fine raw materials with (CR).

Keywords: Crumb rubber; Fiber; Polyvinyl alcohol; Polypropylene; Steel fiber; Flexural behavior; Recycled rubber

Indian Journal of Engineering, 2025, 22(57), e5ije1694

PDF

DOI: https://doi.org/10.54905/disssi.v22i57.e5ije1694

Published: 21 February 2025