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A review on the mechanical characteristics of thermally damaged steel and polypropylene hybrid fiber‑reinforced concretes

He Fengzhen, Biolzi Luigi, Carvelli Valter, Feng Xiaowei

Archives of Civil and Mechanical Engineering

2024

Vol. 24, no. 2

art. no. e69, 2024

Steel and polypropylene hybrid fiber-reinforced concretes have been widely considered for structural applications due to its superior mechanical performance compared to plain and mono fiber-reinforced concretes. Fire is one of the most serious potential risks to concrete structures. The fire resistance of the steel and polypropylene hybrid fiber-reinforced concretes cannot be ignored when assessing the safety of concrete structures. This paper reviews the available studies on the mechanical performance of thermally damaged steel and polypropylene hybrid fiber-reinforced concretes. The deterioration mechanism and the influence of the test factors were discussed. The temperature-dependent mechanical properties of the hybrid fiber-reinforced concretes were analyzed, including compressive elastic modulus, compressive strength, flexural strength, and fracture toughness. In addition, the effect of the post-fire re-curing on the mechanical performance of the thermally damaged steel and polypropylene hybrid fiber-reinforced concretes was also reviewed.