Poster Presentation

Hanan Ali Shalata

Demonstrator, Faculty of Engineering, Tanta University, Egypt‎

Reinforced concrete (RC) members suffer significant material strength loss and concrete ‎cover damage when exposed to elevated temperatures caused by fire. In such cases, it is ‎critical to assess the performance of the fire-affected RC elements and repair them ‎appropriately to ensure the structure's safety and future use. This study proposes a method to ‎repair fire-damaged reinforced concrete columns using strain-hardening cementitious ‎composite (SHCC). Twelve columns with different concrete grades were fabricated. The ‎experimental program included: (1) four non-damaged/non-repaired reference columns; (2) ‎‎four post-fire/non-repaired columns; and (3) four post-fire columns repaired with SHCC. The ‎temperature level and the fire duration were kept constant at 600ºC and two hours, ‎respectively. All the columns were tested under axial compression until failure. The results ‎indicated that the proposed repairing method was capable of increasing the load-carrying ‎capacity and stiffness of fire-damaged columns. Repairing the fire-damaged columns of ‎concrete grades 15, 25, 40, and 60 MPa using SHCC increased the load-carrying capacity by ‎‎239%, 171%, 110%, and 82%, respectively, compared to their counterpart fire-damaged ‎specimens. All specimens were able to restore the original axial capacity, but the concrete ‎specimen with a compressive strength of 60 MPa was unable to. Moreover, post-fire RC ‎columns repaired with SHCC jacket exhibited more ductile behavior and narrower cracks ‎compared to those that were not repaired.‎

Repair, RC columns, Fire, Axial capacity, and SHCC&lrm

Reinforced Concrete Structures (RCS)