常温条件制备粉煤灰-尾矿地聚物的强度与微观结构研究  

Study on strength and microstructure of fly ash-tailings geopolymer prepared under ambient conditions

作　　者：贡嘎顿珠 江述虹 张欢春 DONDROB Kun-ga;JIANG Shu-hong;ZHANG Huan-chun

机构地区：[1]西藏大学工学院,西藏拉萨850000 [2]高原建筑工业化自治区工程研究中心,西藏拉萨850000 [3]西藏集为建设工程有限公司,西藏拉萨850000

出　　处：《砖瓦》2025年第3期16-19,共4页Brick-tile

基　　金：西藏大学“青苗计划”培育项目(ZDQHJH23-06)。

摘　　要：为提高尾矿资源化利用效率,研究了在常温条件下以粉煤灰和尾矿为原料制备地聚物的方法,并测试了不同配比地聚物的抗压强度。通过X射线衍射分析、扫描电子显微镜和傅里叶变换红外光谱测试等技术手段,研究了地聚物的微观结构,并探讨了地聚物强度的影响机理。研究发现,地聚物的抗压强度与液固比、碱灰比和尾矿掺入量呈反比。在液固比为0.3、碱灰比为0.25、灰砂比为1的条件下,28d抗压强度达到2.88MPa,通过优化配合比可进一步提高强度,可用于低强度建筑材料。此外,尾矿并不参与地质聚合反应,但尾矿会损耗碱激发剂并发生物相变化。To improve the efficiency of tailings resource utilization,this paper investigates the preparation and compressive strength of geopolymer derived from fly ash and tailings under ambient conditions,using X-ray diffraction analysis,scanning electron microscopy,and Fourier-transform infrared spectroscopy to study the microstructure of geopolymer and the influence mechanism of strength.The results show that the compressive strength of geopolymer is inversely proportional to liquid-to-solid ratio,alkali-to-fly ash ratio,and tailings content.Under the conditions of a liquid-to-solid ratio of 0.3,an alkali-to-fly ash ratio of 0.25,and a fly ash-to-tailing ratio of 1,the 28d compressive strength reaches 2.88MPa,by optimizing the mix proportion,the strength will be further improved,can be used as low strength building materials.Additionally,tailings do not participate in the geological polymerization reaction but it will consume alkali activator and undergo phase changes.

关 键 词：地聚物 尾矿 粉煤灰 常温条件 强度 微观性质 

分 类 号：TU502[建筑科学—建筑技术科学]