以黄金尾矿砂为细骨料的工程水泥基复合材料性能研究

doi:10.16552/j.cnki.issn1001-1625.2025.0021

摘要/Abstract

摘要： 工程水泥基复合材料(ECC)因具有极高的延性而受到广泛关注。然而,制备ECC的组分通常以高成本、高碳排放的石英砂作为细骨料,这使ECC应用于实际工程中面临着破坏环境、造价高等问题。为了制备成本、碳排放量更低的ECC,本研究通过工业固废产物黄金尾矿砂全比例替代石英砂制备ECC,在不同水胶比及粉煤灰比例下,分别测试并对比黄金尾矿砂基ECC及石英砂基ECC的流动性和力学性能,且通过断裂韧度、纤维分散等试验对力学性能进行了解释,由此探究黄金尾矿砂全比例替代石英砂作为细骨料,制备低成本、低碳排放ECC的可行性。研究结果发现,黄金尾矿砂由于具有更多的棱角,对ECC的流动性能造成了负面影响。但在力学性能方面,使用黄金尾矿砂制备ECC可以有效提高ECC的抗压和抗拉强度,且获得与石英砂基ECC相当的拉伸应变性能。使用黄金尾矿砂全比例替代石英砂制备低碳ECC具有极大的可行性,有助于降低建筑材料制备过程中所产生的碳排放。

关键词: 工程水泥基复合材料, 黄金尾矿砂, 低碳排放, 流动性, 力学性能

Abstract: Engineered cementitious composites (ECC) have attracted a lot of attention because of their high ductility. The preparation of ECC usually uses quartz sand with high cost and high carbon emission as fine aggregate, which makes ECC face the problems of environmental damage and high cost in practical engineering. In order to prepare ECC with lower cost and carbon emission, this study prepared ECC by replacing quartz sand with gold tailing sand, which is an industrial solid waste product. The flowability and mechanical properties of gold tailing sand based ECC and quartz sand based ECC under different water-cementitious material ratios and fly ash ratios were investigated. And the mechanical properties were explained by tests such as fracture toughness and fiber dispersion, so as to explore the feasibility of replacing quartz sand with gold tailings sand as fine aggregate to prepare low cost and low emission ECC. It is found that the flowability of ECC is negatively affected by the gold tailing sand with angular nature shape. However, in terms of mechanical properties, using gold tailing sand to prepare ECC can effectively improve its compressive and tensile strength, and achieve tensile strain performance comparable to quartz sand based ECC. Besides, the use of gold tailing sand to replace quartz sand in the preparation of low carbon ECC is feasible and helps to reduce the carbon emissions generated during the preparation of building materials.

Key words: engineered cementitious composite, gold tailing sand, low carbon emission, flowability, mechanical property

中图分类号:

TU528

于新, 王龙, 何平平, 刘雨松. 以黄金尾矿砂为细骨料的工程水泥基复合材料性能研究[J]. 硅酸盐通报, 2025, 44(7): 2566-2577.

YU Xin, WANG Long, HE Pingping, LIU Yusong. Performance of Engineered Cementitious Composites Prepared with Gold Tailing Sand as Fine Aggregate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2566-2577.

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