Performance of UHP-SHCC Material in Repairing RC Beams Subjected to Torsion.

Atta, A.; Etman, E.; Kassem, Nesreen

doi:10.21608/bfemu.2021.156966

Performance of UHP-SHCC Material in Repairing RC Beams Subjected to Torsion.

Document Type : Research Studies

Authors

¹ Assistant Professor., Faculty of Engineering., Tanta University., Tanta., Egypt.

² Professor of Concrete Structural Engineering Department., Faculty of Engineering., Tanta University.,Tanta., Egypt.

10.21608/bfemu.2021.156966

Abstract

Ultra high performance-strain hardening cementitious composite (UHP-SHCC) is a composite material comprising a cement-based matrix and short polypropylene fibers with outstanding mechanical and protective performance against some natural attack such as sea water. Jacketing with composites on the outer periphery is an effective method to enhance the torsional capacity of distressed reinforced concrete structures and to change the mode of failure from brittle to ductile. This study presents a study on the torsional behaviour of reinforced concrete beams repaired with UHP-SHCC material. Four repaired specimens in addition to the control specimen were tested to examine the beams repaired using a UHP-SHCC layer in different cracking levels and internal steel configurations. The control and the repaired beams were subjected to a pure torsional moment. The failure load, the twist angle of the beams and the strains in the longitudinal and, transverse reinforcement were recorded to failure. In the current study, the ductility ratios and the percentage increase in ductility were investigated. The experimental_results revealed that the repairing techniques and materials could significantly increase the torsional capacity of the pre-cracked beams in torsion and also enhanced the post cracking behaviour of the repaired beams.

Keywords