再生復合微粉混凝土高溫水冷損傷試驗研究

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中圖分類號：TU528 文獻標志碼：A 文章編號：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

再生微粉由廢磚和廢混凝土經細磨加工而成，其特性表現為高細度、顯著火山灰活性和良好的填充效應[1-2]。（剩余8466字）