赤铁矿对偏高岭土基地聚物力学性能及反应机理的影响

doi:10.11896/cldb.24040075

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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).

Key words： geopolymers hematite mechanical property microstructure reaction mechanism

Published: 25 April 2025 Online: 2025-04-18

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TU58

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	Articles by authors
	LUO Yiping
	XING Meiguang
	WANG Defa
	YI Wancheng
	YANG Lianbi
	XUE Guobin

Cite this article:

LUO Yiping,XING Meiguang,WANG Defa, et al. Effect of Hematite on Mechanical Properties and Reaction Mechanism of Metakaolin-based Geopolymers[J]. Materials Reports, 2025, 39(8): 24040075-8.

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https://www.mater-rep.com/EN/10.11896/cldb.24040075 OR https://www.mater-rep.com/EN/Y2025/V39/I8/24040075

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