Microstructure and macroscopic properties of low-carbon concrete subjected to elevated temperature: State-of-the-Art Review

Concrete made from supplementary cementitious materials has received increasing attention due to its low carbon dioxide emissions and excellent service performance. High-temperature induce microstructural deterioration in low-carbon concrete, resulting in diminished mechanical and durability performance, which substantially curtails the service life of the structure. In order to apply low-carbon concrete to infrastructure construction and strategically important buildings, the high-temperature stability of its structure cannot be ignored. Considering the importance of high temperature resistance of low-carbon concrete, this article provides a comprehensive review of the phase composition, microstructure, and macroscopic properties of low-carbon concrete prepared with different supplementary cementitious materials under high temperature conditions. Effective strategies for improving the high-temperature resistance of low-carbon concrete were explored from the perspectives of fibers and aggregates, with a focus on exploring the mechanism of such strategies in dealing with high-temperature damage. This article provides a comprehensive summary of the latest developments in this field and identifies future research needs and challenges. These topics discussed could provide some important insights on researchers and engineers in the fields of low-carbon concrete subjected to elevated temperature.