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Preparation and Physical Properties of Red Mud Based Artificial Lightweight Aggregates

文献类型：期刊论文

作者Han, Rubin3; Zhao, Yunrui3; Luo, Hui3,4; Leng, Hongxiu3; Wu, Wenbo3; Song, Bukai3; He, Bao-Jie1,2
刊名MATERIALS
出版日期2025-08-10
卷号18期号:16页码:25
关键词red mud fly ash physical characteristics lightweight aggregates heavy metals
DOI10.3390/ma18163741
通讯作者Luo, Hui(water@njfu.edu.cn) ; He, Bao-Jie(baojie.he@cqu.edu.cn)
英文摘要Highly alkaline and highly toxic red mud and other bulk industrial solid wastes become severely accumulated, posing huge risks such as soil degradation and environmental pollution. It is urgent to develop a long-term and stable resource disposal method. In the present research, artificial lightweight aggregates were fabricated utilizing industrial solid residues including red mud, phosphate tailing powder, and fly ash as raw materials. The physical characteristics, microstructure, heavy metal leaching attributes, and freeze-thaw resistance under different mixed water and curing conditions were studied. The results showed that, under the optimal curing condition (steam curing temperature of 80 degrees C and curing time of 10 h), lightweight aggregates exhibited the best comprehensive performance, with favorable trends in bulk density, apparent density, softening coefficient, and 1 h water absorption. In addition, the impact of extending the curing time on the further enhancement of the cylinder crush strength is limited. The microscopic morphology study showed that the hydration products in lightweight aggregates are primarily N-A-S-H and C-(A)-S-H, forming a strong colloidal structure and evenly dispersed on the particle surface, thereby improving its strength. Moreover, the heavy metal leachates (Cr, Pb, As, Cu, and Ni) from the lightweight aggregates met the environmental discharge criteria for non-hazardous substances.
WOS关键词ALKALI-ACTIVATION ; CEMENT ; MECHANISM ; CERAMSITE ; CONSTRUCTION ; ASH
资助项目National Natural Science Foundation of China ; Lianyungang Key Research and Development Plan (Social Development) project of China[SF2130] ; Natural Science Foundation of the Jiangsu Higher Education Institutions of China[22KJB560001] ; [52108322]
WOS研究方向Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种英语
WOS记录号WOS:001558022400001
出版者MDPI
源URL[http://ir.qdio.ac.cn/handle/337002/203224]  
专题中国科学院海洋研究所
通讯作者Luo, Hui; He, Bao-Jie
作者单位1.Univ New South Wales, Fac Built Environm, Sydney, NSW 2052, Australia
2.Chongqing Univ, Ctr Climate Resilient & Low Carbon Cities, Sch Architecture & Urban Planning, Chongqing 400045, Peoples R China
3.Jiangsu Ocean Univ, Sch Civil & Ocean Engn, Lianyungang 222005, Peoples R China
4.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式
GB/T 7714		 Han, Rubin,Zhao, Yunrui,Luo, Hui,et al. Preparation and Physical Properties of Red Mud Based Artificial Lightweight Aggregates[J]. MATERIALS,2025,18(16):25.
APA Han, Rubin.,Zhao, Yunrui.,Luo, Hui.,Leng, Hongxiu.,Wu, Wenbo.,...&He, Bao-Jie.(2025).Preparation and Physical Properties of Red Mud Based Artificial Lightweight Aggregates.MATERIALS,18(16),25.
MLA Han, Rubin,et al."Preparation and Physical Properties of Red Mud Based Artificial Lightweight Aggregates".MATERIALS 18.16(2025):25.

入库方式： OAI收割

来源：海洋研究所

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