The effect of waste glass incorporation on the high-temperature resistance of cement-based concrete

Waste glass concrete, as a solid waste building material, can alleviate resource waste and achieve carbon reduction in buildings. However, the high-temperature melting and softening characteristics of glass alter the damage pattern of concrete. To promote the application of waste glass concrete, exploring its fire safety is crucial. Research indicates that glass can be used to replace concrete aggregates or cementitious materials according to different particle sizes. According to the application type of glass in concrete, this paper demonstrates the influence of different substitution methods on concrete performance. Subsequently, the thermal properties of waste glass concrete were statistically analyzed, revealing that the low thermal conductivity of glass enhances the thermal insulation performance of concrete. Additionally, the influence mechanism of glass on concrete high-temperature damage from the perspectives of high-temperature melting and condensation of glass was summarized. The high-temperature damage behavior of waste glass concrete was systematically discussed in terms of appearance characteristics, mass loss, compressive strength, tensile strength, and other aspects. The results indicate that glass gradually begins to melt and soften after 600℃, allowing it to fill and heal concrete cracks and delay the rate of mechanical performance degradation, and is an environmentally friendly material with excellent high-temperature resistance. With the advocacy for low-carbon buildings, the study of glass concrete holds significant scientific significance and application value. Therefore, this article proposes some follow-up hot research topics based on existing research.