江西建材Issue(5)：19-22,36,5.
特细铁尾矿砂改良黏土力学性能研究
Study on the Improvement of Mechanical Properties of Clay by Adding Ultrafine Iron Tailings Sand
陈龙庭 1金坚定 1黄维 1陈春香 1郑好瑜2
作者信息
- 1. 浦江公路与运输事业发展中心,浙江 金华 321000
- 2. 河海大学,江苏 南京 210024
- 折叠
摘要
Abstract
To address the need for enhancing the performance of clay subgrades and the resource utilization of iron tailings sand,this study systematically analyzed the effects of the addition of ultrafine iron tailings sand and cement on the mechanical properties of the improved soil through indoor experiments.Specimens were prepared based on the optimum moisture content,and California Bearing Ratio(CBR)and unconfined compressive strength tests were conducted at 7 days and 28 days.The microscopic mechanism was revealed by scanning electron microscopy and BET nitrogen adsorption method.The results show that the CBR and unconfined compressive strength of the improved soil increase first and then decrease with the increase of iron tailings sand content,reaching the peak at 50％content.The addition of cement significantly enhances the strength,but the increase slows down when the content exceeds 2％.The optimal ratio is 50％iron tailings sand+2％cement.Microscopic analysis indicates that at 50％content,a dense cementation network is formed by tailings sand,clay,and cement,with the mesopore volume reduced to 0.081 7 cm3/g and the macropore volume decreased by 25.91％,significantly optimizing the pore structure.The study confirms that the improved soil meets the requirements of high-grade highway subgrades and has both solid waste resource utilization and engineering economic value.关键词
铁尾矿砂/加州承载比/无侧限抗压强度/微观特性Key words
Iron tailings sand/California Bearing Ratio(CBR)/Unconfined compressive strength/Microscopic characteristics分类
建筑与水利引用本文复制引用
陈龙庭,金坚定,黄维,陈春香,郑好瑜..特细铁尾矿砂改良黏土力学性能研究[J].江西建材,2026,(5):19-22,36,5.
