A state-of-the-art review on high temperature resistance of lightweight aggregate high-strength concrete

Lightweight aggregate high-strength concrete (LWA-HSC) exposed to high temperatures usually exhibits the poor resistance to the deterioration properties of materials, which would be bring about a serious threat to the safety of concrete structures after fire disaster or high temperature action. It is of great significance to explore the damage mechanism of LWA-HSC at elevated tem-peratures aiming at its popularization and application in the practical engineering. Based on the research status of LWA-HSC performance behavior at home and abroad, the damage evolution mechanisms of concrete at elevated temperatures were first summarized and introduced. The in-fluence of some factors, including lightweight aggregate types and dosage, replacement ratio, heating rate, and cooling system, on the mechanical and durability-related properties of LWA-HSC after high temperatures was further discussed, and the strengthening mechanisms of the re-sistance to high temperature was elaborated and analyzed. On this basis, the future research on the performance behavior of LWA-HSC would be finally proposed, which is helpful to perfect the-oretical development and technological innovation.