再生复合微粉混凝土高温水冷损伤试验研究

打开文本图片集

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

Abstract：The utilization of compositerecycled micro-powder（recycled brick powder andrecycled concrete powder）was investigatedtoimprovetheresourceutilizationrateof construction wasteandenhance thefireresistanceofconcrete.A replacement of 20% cement was used under high - temperature conditions （2Oo、400、6OO and 800 C ）． The relative wave sped and damage factor were measured byultrasonic testing，andthe microstructure was observedand analyzedusing SEM. Theresultsindicated that with increasing temperature，themasslossrate，internaldamagedegree，andcompresivestrength decreased.Specimens incorporating compositerecycledmicro-powder exhibited beterperformance athigh 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 range. SEM observations revealed the mechanisms of compressve strength loss and internal damage.It was concluded that anappropriate amount ofcomposite recycled micro-powder can significantly improvethe hightemperature performance of concrete，providing data support and research foundation for enhancing fire resistance.

Keywords：compositerecycledfinepowderconcrete；high temperature；compresivestrength；ultrasonic testing；micro-analysis

0 引言

再生微粉由废砖和废混凝土经细磨加工而成，其特性表现为高细度、显著火山灰活性和良好的填充效应[1-2]。（剩余8466字）