Behavior of repaired projectile bullet damaged reinforced concrete beams using CFRP sheet in conjunction with natural aggregate or recycled aggregate concrete layer

Abstract

In this study, the bullet projectile performance of repaired projectile bullet damaged recycled aggregate (RA) or natural aggregate (NA) RC beams using carbon fiber reinforced polymer (CFRP) sheets in conjunction with RA or NA concrete was experimentally investigated. The experiment consists of a total of six subjected to projectile bullet loading. The effect of the type of material used in combination with the CFRP sheet was studied. According to the test findings, utilizing the CFRP sheet demonstrated a much higher load capacity than the control beams, but a decreased level of ductility. Therefore, CFRP sheet is a viable repair technique of projectile bullet damaged RA or NA RC beams. Besides, the results show that the repaired damaged RC beams with CFRP combined with the NA layer had a higher load compared to the repaired damaged RC beams with CFRP combined with the RA layer. However, CFRP in combined with RA shows a good enhancement in load capacity (115.6–117.8%). The repaired beams with CFRP and NA layer showed debonding failure while using RA with CFRP showed debonding with cover separation in repairing RA beam.

Keywords:

• Natural aggregate
• recycled aggregate
• carbon fiber reinforced polymer
• sheet
• projectile bullet
• repair
• debonding

Acknowledgment

I would like to acknowledge the financial support from the King Abdullah II Fund for Development KAFD and Jordan Design and Development Bureau (JODDB). In addition, I would like to acknowledge and appreciate my colleague Eng. Reem Bataineh and my students Abdel Rahman Sweidan, Mohannad Saimeh, and Yousif Obaidi for their help, endless support, and valuable hints throughout the experiment.

Disclosure statement

No potential conflict of interest was reported by the authors.