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锑尾矿粗集料(ATCA)混凝土的强度和耐久性性能

Strength and Durability Properties of Antimony Tailing Coarse Aggregate (ATCA) Concrete.

作者信息

Li Long, Wang Jianqun, Zhang Longwei, Deng Renjian, Zhou Saijun, Wang Gongxun

机构信息

Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control, School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.

出版信息

Materials (Basel). 2021 Sep 27;14(19):5606. doi: 10.3390/ma14195606.

Abstract

Antimony (Sb) is a trace element applied widely in modern industry. A large number of tailing solid wastes are left and accumulated in the mining area after purifying the precious antimony from the antimony ores, causing serious pollution to the environment. The major aim of this study is to investigate the feasibility of utilizing antimony tailing coarse aggregate (ATCA) as a complete substitute for natural coarse aggregate (NCA) in high-strength concrete. Concrete specimens with 25%, 50%, 75%, and 100% ATCA replacing the NCA in conventional concrete were prepared for evaluating the performance of ATCA concrete. The investigators find that ATCA concrete has good workability, and the mechanical properties and long-term behavior (shrinkage and creep) of ATCA concrete with all replacement levels are superior to those of NCA concrete. The durability indices of ATCA concrete, such as the frost-resistant, chloride permeability, and resistance to carbonation, are better than those of NCA concrete. While the alkali activity and cracking sensitivity behavior of ATCA concrete seem to be decreased, nevertheless, the difference is not significant and can be neglected. The researchers demonstrate that all of the control indices of ATCA concrete meet the requirements of the current industry standards of China. Overall, ATCA can be used in concrete to minimize environmental problems and natural resources depletion.

摘要

锑(Sb)是一种在现代工业中广泛应用的微量元素。从锑矿石中提纯出珍贵的锑后,矿区会留下并堆积大量尾矿固体废物,对环境造成严重污染。本研究的主要目的是探讨在高强度混凝土中使用锑尾矿粗骨料(ATCA)完全替代天然粗骨料(NCA)的可行性。制备了用25%、50%、75%和100%的ATCA替代传统混凝土中NCA的混凝土试件,以评估ATCA混凝土的性能。研究人员发现,ATCA混凝土具有良好的工作性,所有替代水平的ATCA混凝土的力学性能和长期性能(收缩和徐变)均优于NCA混凝土。ATCA混凝土的耐久性指标,如抗冻性、氯离子渗透性和抗碳化性,均优于NCA混凝土。虽然ATCA混凝土的碱活性和开裂敏感性行为似乎有所降低,但差异不显著,可以忽略不计。研究人员证明,ATCA混凝土的所有控制指标均符合中国现行行业标准的要求。总体而言,ATCA可用于混凝土中,以最大限度地减少环境问题和自然资源消耗。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1f/8510015/ccaa40afe083/materials-14-05606-g001.jpg

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