赤铁矿对偏高岭土基地聚物力学性能及反应机理的影响  

Effect of Hematite on Mechanical Properties and Reaction Mechanism of Metakaolin-based Geopolymers

作　　者：雒亿平 邢美光 王德法[2] 易万成 杨连碧 薛国斌 LUO Yiping;XING Meiguang;WANG Defa;YI Wancheng;YANG Lianbi;XUE Guobin(College of Water Resources and Hydropower,Xi’an University of Technology,Xi’an 710048,China;College of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;Senior Engineer of State Grid Gansu Electric Power Company,Lanzhou 730030,China)

机构地区：[1]西安理工大学水利水电学院,西安710048 [2]西安理工大学土木与建筑工程学院,西安710048 [3]国网甘肃省电力公司,兰州730030

出　　处：《材料导报》2025年第8期108-115,共8页Materials Reports

基　　金：榆林市2020年科技计划项目(CXY-2020-081);基于粉煤灰高效利用的地聚合物混凝土热力学性能研究(2023-YBSF-440)。

摘　　要：探讨了赤铁矿对偏高岭土基地聚物力学性能及反应机理的影响,分析添加不同含量的赤铁矿对地聚物抗压强度、微观结构变化和物相变化的影响。研究表明:偏高岭土基地聚物的流动度随赤铁矿掺量的增加而降低。当赤铁矿掺量从0.2%增至0.6%时,试件抗压强度增长率从27.97%跃升至56.46%,掺量为0.6%的试样抗压强度达到49.17 MPa。当添加0.6%的赤铁矿固化1 d后,试件抗压强度达到44.31 MPa,为7 d强度的90%,表明赤铁矿的掺加对地聚物的早期强度有显著的改善效果。赤铁矿提供了铁元素,平衡了地聚物体系中的n(Si)/n(Al)和n(Si)/n(Fe)。热重分析结果表明,MKF-0试样总质量损失达88.46%,MKF-0.6试样总质量损失达87.58%,赤铁矿颗粒的加入促使更多的胶凝物质生成。SEM显微图表明,赤铁矿同时作为增强剂和填料,使地聚物凝胶区域更均匀、致密。XRD和FTIR结合分析表明,添加赤铁矿,偏高岭土基地聚物会同时产生铝硅酸盐(N-A-S-H)和铝硅酸铁(Fe(Al)-S-H)以及硅酸铁(Fe_(2)(SiO_(4))_(3))物质。The effects of hematite on the mechanical properties and reaction mechanism of metakaolin-based polymers were discussed,and the effects of different contents of hematite on the compressive strength,microstructure and phase changes of geopolymers were analyzed.The results show that the fluidity of metakaolin-based polymers decreases with the increase of hematite content.When the hematite content increases from 0.2%to 0.6%,the growth rate of the compressive strength of the specimen jumps from 27.97%to 56.46%,and the compressive strength of the specimen with 0.6%content reaches 49.17 MPa.When 0.6%hematite was added for 1 day,the compressive strength of the specimen reached 44.31 MPa,which was 90%of the 7-day strength,indicating that the addition of hematite had a significant improvement effect on the early strength of geopolymers.Hematite provides iron and balances n(Si)/n(Al)and n(Si)/n(Fe)in the geopolymer system.The results of thermogravimetric analysis showed that the total mass loss of MKF-0 specimen was 88.46%,and that of MKF-0.6 specimen was 87.58%,and the addition of hematite particles promoted the formation of more cementitious substances.SEM micrographs show that hematite acts as both a reinforcing agent and a filler,making the geopolymer gel region more uniform and dense.XRD and FTIR analysis showed that the addition of hematite and metakaolin-based polymers produced both aluminosilicate(N-A-S-H)and iron aluminosilicate(Fe(Al)-S-H)and iron silicate(Fe_(2)(SiO_(4))_(3)).

关 键 词：地聚物 赤铁矿 力学性能 微观结构 反应机理 

分 类 号：TU58[建筑科学—建筑技术科学]