Effect of Hematite on Mechanical Properties and Reaction Mechanism of Metakaolin-based Geopolymers
LUO Yiping1,*, XING Meiguang1, WANG Defa2, YI Wancheng2, YANG Lianbi2, XUE Guobin3
1 College of Water Resources and Hydropower, Xi'an University of Technology, Xi'an 710048, China 2 College of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China 3 Senior Engineer of State Grid Gansu Electric Power Company, Lanzhou 730030, China
Abstract: 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 (Fe2(SiO4)3).
雒亿平, 邢美光, 王德法, 易万成, 杨连碧, 薛国斌. 赤铁矿对偏高岭土基地聚物力学性能及反应机理的影响[J]. 材料导报, 2025, 39(8): 24040075-8.
LUO Yiping, XING Meiguang, WANG Defa, YI Wancheng, YANG Lianbi, XUE Guobin. Effect of Hematite on Mechanical Properties and Reaction Mechanism of Metakaolin-based Geopolymers. Materials Reports, 2025, 39(8): 24040075-8.
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2025, Vol. 39 
