陶瓷粉对碱激发UHPC高温性能的影响研究

Research on the Influence of Ceramic Powder on the High-Temperature Performance of Alkali-Activated UHPC

摘要: 本研究将陶瓷粉应用于碱激发UHPC体系，用废弃陶瓷粉以10%、20%和30%的质量分数等量替代矿粉，从宏观角度初步探讨了陶瓷粉对碱激发超高性能混凝土(UHPC)高温性能的影响。研究通过对试样在经历200℃、400℃、600℃和800℃高温处理后的外观形貌、质量损失和残余抗压强度进行系统性测试，旨在揭示陶瓷粉的作用规律与机制。研究发现，掺入陶瓷粉能有效提升碱激发UHPC的高温稳定性，减轻表面损伤并降低质量损失。其中，20%掺量的陶瓷粉试样在高温后表现出最优的综合力学性能，在600℃和800℃下的残余抗压强度分别达到了86.25 MPa和77.50 MPa。研究认为，陶瓷粉通过物理填充和潜在的火山灰反应，生成了更耐热的物相，从而改善了材料的高温性能。

Abstract: This study investigated the application of ceramic powder in an alkali-activated UHPC system, replacing mineral powder with waste ceramic powder at mass fractions of 10%, 20%, and 30% on a weight-for-weight basis. From a macroscopic perspective, the study preliminarily examined the influence of ceramic powder on the high-temperature performance of alkali-activated ultra-high-performance concrete (UHPC). Through systematic testing of the specimens surface morphology, mass loss, and residual compressive strength after high-temperature treatment at 200˚C, 400˚C, 600˚C, and 800˚C, the study aimed to reveal the behavior patterns and mechanisms of ceramic powder. The results showed that the incorporation of ceramic powder effectively enhances the high-temperature stability of alkali-activated UHPC, reduces surface damage, and minimizes mass loss. Specifically, specimens containing 20% ceramic powder exhibited the best overall mechanical properties after high-temperature treatment, with residual compressive strengths of 86.25 MPa and 77.50 MPa at 600˚C and 800˚C, respectively. The study suggests that ceramic powder generates more heat-resistant phases through physical filling and potential pozzolanic reactions, thereby improving the material’s high-temperature performance.