Fracture property of polypropylene fibre-reinforced lightweight concrete at high temperatures

The main purpose of this study was to investigate the fracture property of polypropylene fibre (PPF)-reinforced lightweight concrete (LWC) at high temperatures, and also the basic properties including compressive strength, mass loss and relative elastic modulus at different temperatures were investigated. The results showed that adding PPFs into LWC decreased its compressive strength at high temperatures. PPFs could improve the fracture energy of LWC at an ambient temperature. The fracture energy of LWC without PPF reinforcement tended to increase with the increase of temperature. The fracture toughness exhibited a downwards trend with the increase of temperature.