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崔   峰1 ,2 ,  劉歷波1 ,2 ,  王曉磊1 ,2 ,  李彥蒼1 ,2

( 1 .  河北工程大學(xué) 土木工程學(xué)院 ，邯鄲 056007 ;  2.  邯鄲市城市地下空間工程技術(shù)創(chuàng)新中心 ，邯鄲 056007)

摘   要 ：為提升建筑廢棄物資源化利用率并改善混凝土抗火性能 ， 以復(fù)合再生微粉（ 再生磚粉與再生混凝 土粉） 為研究對象 ，探討其在高溫條件下對混凝土性能的影響。通過替代 20% 水泥 ，在 200 、400 、600 和 800 ℃ 高溫處理下進行測試 ，采用超聲波檢測技術(shù)測定相對波速和損傷因子 ， 同時利用 SEM 對微觀結(jié)構(gòu)進行觀 察和分析。結(jié)果表明： 隨著溫度升高 ，試件質(zhì)量損失率 、內(nèi)部損傷程度增加 ，抗壓強度下降 ；摻入復(fù)合再生微 粉的試件在高溫下表現(xiàn)出更優(yōu)性能 ，特別是再生混凝土粉與磚粉質(zhì)量比為 3 ∶7 和 7 ∶3 的試件在 400 ~ 800 ℃范圍 內(nèi)性能最優(yōu) ；SEM 觀察揭示了混凝土抗壓強度損失與內(nèi)部損傷機理。合理摻量的復(fù)合再生微粉可顯著提升混凝 土耐高溫性能 ，為改善混凝土抗火性能提供了數(shù)據(jù)支持與研究基礎(chǔ)。

關(guān)鍵詞：復(fù)合再生微粉混凝土 ；高溫 ；抗壓強度 ；超聲波檢測 ；微觀分析

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

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

基金項目： 國家自然科學(xué)基金資助項目  (U21 A20164) 。

作者簡介：崔   峰 (1999—) ,  男 ，碩士研究生。研究方向： 混凝土材料。

通信作者： 王曉磊  (1983—) ,   男 ，博士 ，教授。研究方向： 建筑平移與頂升。

收稿日期：2024 - 12 - 31