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王   全¹ , 陈永亮^1,2 , 朱肖情¹ , 杨金健¹ , 李傲君³

 

(1. 武汉科技大学 资源与环境工程学院 , 武汉   430081;

2. 国家环境保护矿冶资源利用与污染控制重点实验室 , 武汉   430081;

3. 宝武环科武汉金属资源有限责任公司 , 武汉   430081)

摘  要: 为了促进建筑垃圾资源化利用 , 采用机械-热处理联合活化建筑垃圾制备再生微粉 , 研究了不同球磨时间和煅烧温度对建筑垃圾活性激发效果的影响 , 并利用 X 射线衍射  (XRD) 和扫描电子显微镜  (SEM) 揭示其微观结构和作用机理 。结果表明 : 再生微粉经过 30 min 球磨后 , 其活性指数可达到 79. 0%。继续进行煅烧处理可进一步提高其活性 , 当煅烧温度为 800 ℃ 时 , 再生微粉的活性指数达到 96. 0% , 主要性能满足 JG/T573— 2020《混凝土和砂浆用再生微粉》 的要求 。微观分析表明 , 机械球磨可以增大微粉的比表面积 , 改善粒度分布 ,促进水化反应的进行 , 经过 800 ℃ 活化的再生微粉可水化生成大量片状 Ca (OH)2 与絮状 C-S-H 凝胶紧密粘接 ,针状钙矾石交织穿插形成网状结构 , 提高了试块强度 。为建筑垃圾再生微粉的应用提供技术指导和理论依据。

关键词: 建筑垃圾 ; 再生微粉 ; 机械活化 ; 热活化 ; 活性指数 ; 水化产物

中图分类号: X705      文献标志码: A      文章编号: 1005-8249 (2026) 04-0050-06

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 008

 

Preparation of Recycled Fine Powder by Mechanically-Thermal

Activation of Construction Waste and Mechanism

WANG Quan¹ , CHEN Yongliang^1,2 , ZHU Xiaoqing¹ , YANG Jinjian¹ , LI Aojun³

(1. School of Resource and Environmental Engineering, Wuhan University of

Science and Technology, Wuhan 430081, China;

2. National Key Laboratory of Mining and Metallurgical Resources Utilization and Pollution Control for Environmental Protection, Wuhan 430081, China;

3. Baowu Huanke Wuhan Metal Resources Co. , Ltd. , Wuhan 430081, China)

Abstract : In order to promote the resource utilization of construction waste, construction waste recycled fine powder was prepared by combined activation of mechanical and thermal treatment. The effects of different ball milling times and calcination temperatures on the activity excitation were studied, and the microstructure and action mechanism were analyzed by X -ray diffraction (XRD) and scanning electron microscope (SEM). The results show that after 30 minutes of ball milling, the activity index of recycled fine powder reaches 79. 0%.  Further firing treatment at 800 ℃ can improve the activity, the activity index reaches 96. 0% and main properties meet the requirements of " Regenerated Micropowder for Concrete and Mortar" JG/T573- 2020. Microscopic analysis shows that mechanical ball milling can increase the specific surface area of the fine powder and improve the particle size distribution to promote the hydration reaction.  After the fine powder is activated at 800℃ , a large number of plate-like Ca (OH)2 are closely bonded with the flocculent C-S-H gel, and acicular ettringite are interwoven to form a network structure in hydration product, which improves the strength of the test block.

Key words: construction  waste;  recycled  fine  powder;  mechanical  activation;  thermal  activation;  activity index; hydration product