Fire Response of circular RC Columns Strengthened with PBO FRCM

This research paper investigates the fire performance of circular RC columns that were strengthened with poly-paraphenylene-ben-zobisoxazole (PBO) fabric-reinforced cementitious matrix (FRCM) system. Four identical columns were cast, with three of them being strengthened using varying number of PBO-FRCM layers. The fire exposure followed ASTM E119 standards. The temperature response curves were analyzed, and the post-fire conditions were evaluated. Initially, the columns with greater number of PBO-FRCM layers exhibited significantly lower temperatures. However, excessive spalling of the concrete led to similar temperature readings in both the strengthened and non-strengthened columns. These findings highlight the effectiveness of PBO-FRCM in reducing temperatures, despite the vulnerability to spalling during the prolonged exposure to fire.Paper 317 - this paper was withdrawn from CICE 2023. It was not presented at the conference, nor does it appear in the official proceeding