Effect of high-temperature exposure on fibre-reinforced concrete with quaternary binder systems

Abstract High rise buildings are frequently exposed to severe weather conditions including heat, fire, and temperature changes, which can seriously harm structural components like concrete. The utilization of fly ash (FA), calcined clay (CC), and silica fume (SF) as additional cementitious materials when combined with polypropylene fibres (PP) in high strength concrete (HSC) is investigated in this study. These materials, which are industrial byproducts, offer a sustainable way to lower carbon emissions related to the manufacturing of cement. When concrete is exposed to temperatures between 200 and 500 degrees Celsius, the addition of PP fibres increases the concrete’s durability and resistance to spalling. However, thermal deterioration causes the concrete to noticeably lose compressive strength when the exposure temperature rises beyond 500 °C. A blend of 17.5% FA, 5% CC, and 5.5% SF can lower carbon emissions by more than 25% when compared to traditional HSC, according to sustainability evaluation. The results show that the FA, CC, SF, and PP fibres work together to improve strength, durability, and moderate heat resistance while lowering the demand for conventional cement. This method encourages environmentally friendly, sustainable concrete that is suitable for modern structures that are subjected to exceptionally high temperatures.