Abstract
This paper performed compressive tests on 24 cylindrical specimens strengthened by an ultra-high performance fiber-reinforced concrete (UHPFRC) jacket. In order to investigate the influence of the concrete strength on the confinement effectiveness, the tests were made with 3 different concrete grades, C25, C40, and C60, using jackets with 25 mm and 35 mm thickness. The results showed that the UHPFRC jacket might significantly increase the confined concrete strength for the 3 different concrete classes. The circumferential strain analysis showed that the relation between the concrete strength and the jacket thickness impacts the jacket's effectiveness. This influence seems essential in comprehending the UHPFRC jacket with undersized or oversized dimensions. Some concrete confinement models were tested to predict the confined concrete strength. A suggestion of an equation to predict the concrete strength was proposed based on the influence of the behavior of the oversized and undersized UHPFRC jacket thickness.
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