硫酸盐侵蚀作用下碱激发金尾矿充填体性能研究  

Study on the Performance of Alkali Activated Gold Tailing Filler Under the Effect of Sulfate Erosion

作　　者：龙庆辉 刘坤 李曙光 章本本 蒋波[3] Long Qinghui;Liu Kun;Li Shuguang;Zhang Benben;Jiang Bo(Hunan Yiyang Highway and Bridge Construction Co.,Ltd.,Yiyang 413000,China;Hunan Zhitong Expressway Construction and Development Co.,Ltd.,Changsha 410000,China;College of Civil Engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湖南省益阳公路桥梁建设有限责任公司,湖南益阳413000 [2]湖南省芷铜高速公路建设开发有限公司,湖南长沙410000 [3]湘潭大学土木工程学院,湖南湘潭411105

出　　处：《市政技术》2023年第10期223-229,共7页Journal of Municipal Technology

基　　金：湖南省教育厅优秀青年项目(21B0123)。

摘　　要：为研究硫酸盐侵蚀作用对碱激发金尾矿充填体性能的影响机理,基于室内模拟硫酸盐侵蚀试验,通过表观形貌、无侧限抗压强度、质量变化以及微观表征手段,探究了在清水环境以及硫酸钠溶液、硫酸镁溶液、硫酸钠+硫酸镁混合溶液侵蚀环境下,碱激发金尾矿充填体宏观力学特性和微观特征的演变过程。研究结果表明,硫酸镁溶液和硫酸钠+硫酸镁混合溶液对充填体性能的劣化损伤作用远大于硫酸钠溶液和清水。随着浸泡龄期的增加,在硫酸镁溶液和硫酸钠+硫酸镁混合溶液中的充填体表观损伤严重,无侧限抗压强度持续减小直至丧失承载力,质量先增加后减少;而在硫酸钠溶液和清水中的充填体表观形貌未发生明显变化,无侧限抗压强度不断增大直至平缓稳定,质量缓慢减少。总体而言,硫酸盐对充填体性能的劣化损伤作用从高到低依次为硫酸镁>硫酸钠+硫酸镁>硫酸钠。The influence mechanism of sulfate erosion on the performance of alkali activated gold tailing filler is studied in this paper.Based on indoor simulated sulfate erosion tests,under a clear water environment and a corrosive environment of sodium sulfate solution,magnesium sulfate solution,and a mixture of sodium sulfate and magnesium sulfate solution,the evolution process of macroscopic mechanical and microscopic characteristics of alkali activated gold tailing fller were studied by the apparent morphology,unconfined compressive strength,quality changes,and microscopic characterization methods.The research results indicate that the degradation damage effect of magnesium sulfate solution and sodium sulfate+magnesium sulfate mixed solution on the performance of the filler was much greater than that of sodium sulfate solution and water.With the soaking age increasing,the apparent damage of the fller in the mixed solution was severe.The unconfined compressive strength continued to decrease until the bearing capacity was lost.The mass first increased and then decreased;However,there was no significant change in the apparent morphology of the fller in sodium sulfate solution and clear water.The unconfined compressive strength continued to increase until it became stable while the mass slowly decreased.Generally,the degradation and damage effects of sulfate on the performance of filler were in descending order of magnesium sulfate>sodium sulfate+magnesium sulfate>sodium sulfate.

关 键 词：硫酸盐侵蚀 碱激发 金尾矿 充填体 

分 类 号：TU528.01[建筑科学—建筑技术科学]