Structural performances of thermally conditioned PBO FRCM confined concrete cylinders

The performances of plain concrete elements confined with PBO (short of Polypara-phenylene-benzo-bisthiazole) fabric meshes embedded into an inorganic stabilized cementitious matrix (Fabric ReinforcedCementitious Mortar, FRCM) and subjected to thermal conditioning are analysed in the paper.The analysis is developed by results of compression tests on PBO-FRCM wrapped plain concrete cylindricalspecimens. Parameters varied were the fibres reinforcement ratio, the concrete strength and thetemperature value, ranging from 20 C (ambient temperature) to 250 C, used for the thermal conditioningof specimens. The effects of the thermal conditioning on the structural response of confined cylindershave been analysed in terms of failure modes, peak strength, axial and transversal (hoop) strains, andductility.Test results were used to define an empirical coefficient that accounts for the thermal conditioningeffects in design models commonly adopted to predict the peak strength and the corresponding strainof the PBO-FRCM wrapped specimens.