Concrete has been the most widely used construction material in recent decades, while the use of macro-polymer fibres has gained increasing attention due to their significant advantages. Despite the commendable structural performance of concrete, it is crucial to recognize that…
Concrete has been the most widely used construction material in recent decades, while the use of macro-polymer fibres has gained increasing attention due to their significant advantages. Despite the commendable structural performance of concrete, it is crucial to recognize that fiber- reinforced concrete faces a substantial risk when exposed to certain conditions, such as elevated temperatures. Although there is extensive scientific literature on this subject, much of it does not capture the material’s behaviour at the precise moment it is subjected to high temperatures. To address this gap, the present research focuses on analysing the flexural response of fiber-reinforced concrete at 20°C, 165°C, 185°C, and 200°C. For this study, it was essential to carefully isolate the specimens to minimize temperature loss during testing. Upon completion of the tests and thorough fracture surface analysis, the results indicated that polyolefin fibers reduce the risk of spalling; as temperature increases, the residual load-bearing capacity of the material diminishes, approaching that of plain concrete at the highest temperature studied.