崔   峰1 ,2 ,  刘历波1 ,2 ,  王晓磊1 ,2 ,  李彦苍1 ,2

( 1 .  河北工程大学 土木工程学院 ，邯郸 056007 ;  2.  邯郸市城市地下空间工程技术创新中心 ，邯郸 056007)

摘   要 ：为提升建筑废弃物资源化利用率并改善混凝土抗火性能 ， 以复合再生微粉（ 再生砖粉与再生混凝 土粉） 为研究对象 ，探讨其在高温条件下对混凝土性能的影响。通过替代 20% 水泥 ，在 200 、400 、600 和 800 ℃ 高温处理下进行测试 ，采用超声波检测技术测定相对波速和损伤因子 ， 同时利用 SEM 对微观结构进行观 察和分析。结果表明： 随着温度升高 ，试件质量损失率 、内部损伤程度增加 ，抗压强度下降 ；掺入复合再生微 粉的试件在高温下表现出更优性能 ，特别是再生混凝土粉与砖粉质量比为 3 ∶7 和 7 ∶3 的试件在 400 ~ 800 ℃范围 内性能最优 ；SEM 观察揭示了混凝土抗压强度损失与内部损伤机理。合理掺量的复合再生微粉可显著提升混凝 土耐高温性能 ，为改善混凝土抗火性能提供了数据支持与研究基础。

关键词：复合再生微粉混凝土 ；高温 ；抗压强度 ；超声波检测 ；微观分析

中图分类号：TU528           文献标志码：A        

文章编号： 1005- 8249  (2025)  03- 0006- 08 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .03 .002

CUI Feng^1,2，LIU Libo¹，WANG Xiaolei^1,2，LI Yancang¹

(1. College of Civil Engineering Hebei University of Engineering, Handan 056007 China;

2. Urban Underground Space Engineering Technology Innovation Center in Handan City, Handan 056007 China)

Abstract: The utilization of composite recycled micro-powder (recycled brick powder and recycled concrete powder) was investigated to improve the resource utilization rate of construction waste and enhance the fire resistance of concrete. A replacement of 20% cement was used under high-temperature conditions (200°C, 400°C, 600°C, and 800°C). The relative wave speed and damage factor were measured by ultrasonic testing, and the microstructure was observed and analyzed using SEM. The results indicated that with increasing temperature, the mass loss rate, internal damage degree, and compressive strength decreased. Specimens incorporating composite recycled micro-powder exhibited better performance at high temperatures, particularly those with a mass ratio of recycled concrete powder to brick powder of 3:7 and 7:3, which showed the best performance within the 400°C to 800°C range. SEM observations revealed the mechanisms of compressive strength loss and internal damage. It was concluded that an appropriate amount of composite recycled micro-powder can significantly improve the high-temperature performance of concrete, providing data support and research foundation for enhancing fire resistance.

Keywords: composite recycled fine powder concrete ; high temperature ; compressive strength ;ultrasonic testing ; micro-analysis

基金项目： 国家自然科学基金资助项目  (U21 A20164) 。

作者简介：崔   峰 (1999—) ,  男 ，硕士研究生。研究方向： 混凝土材料。

通信作者： 王晓磊  (1983—) ,   男 ，博士 ，教授。研究方向： 建筑平移与顶升。

收稿日期：2024 - 12 - 31