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Flexural and Shear Behavior of Rubberized High Strength Reinforced Concrete Beams Strengthened with CFRP

Ahmed S. Eisa 1, Ahmed Gab Allah 1, Ragab Shaker Mahmoud 1, and Ahmed Ibrahim 2
1. Department of Structural Engineering, Faculty of Engineering, Zagazig University, Zagazig, Egypt
2. Department of Civil and Environmental Engineering, University of Idaho, Moscow, ID, 83843, USA

Manuscript received December 1, 2020; revised March 21, 2021; accepted May 8, 2021; issue published July 16, 2021.

Abstract—This study presents an experimental investigation of the flexural and shear behavior of strengthened high strength concrete (HSC) beams made with rubberized concrete. CFRP has been used in strengthening of all beams in shear and bending. The concrete mixtures have included a 15% of sand replaced with crumbed rubber with a size of 2 mm. Ten (10) simple span concrete beams have been prepared and tested to promote both flexure and shear failures. The tested beams were divided into two groups, where each group was divided into five beams. The first group was tested to fail in flexure and the second group in shear. Beams with crumbed rubber showed very good flexural and shear strength and all the strengthening techniques used were very effective in both flexure and shear. It was found that the most effective flexural and shear failure loads were increased by 51% and 64%, respectively. Overall, the results showed the feasibility of using rubberized beams in structural applications.

Index Terms—crumb rubber, compressive strength, strengthening, flexural Strength, CFRP, ductility

Cite: Ahmed S. Eisa, Ahmed Gab Allah, Ragab Shaker Mahmoud, and Ahmed Ibrahim, "Flexural and Shear Behavior of Rubberized High Strength Reinforced Concrete Beams Strengthened with CFRP," International Journal of Structural and Civil Engineering Research, Vol. 10, No. 3, pp. 98-105, August 2021. doi: 10.18178/ijscer.10.3.98-105

​Copyright © 2021 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.