纳米Al<sub>2</sub>O<sub>3</sub>和钢纤维复合增强煤矸石-矿渣基地聚合物灌浆材料的性能研究

doi:10.11896/cldb.24050076

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Abstract Coal gangue, as an industrial solid waste generated in the process of coal mining, can be used as a gel material to prepare geopolymer grouting materials. It is an effective way to make full use of coal gangue and achieve green and low-carbon development. In this work, the crushed coal gangue powder by ball milling and slag were used as matrix, and modified by different volume fractions of steel fiber (SF) (0%, 0.5%, 1.0%, 1.5%, 2.0%) and nano-Al₂O₃(1.0%, 2.0%, 3.0%). Then the mechanical properties, rheological properties and microscopic analysis of the composite nano-Al₂O₃ grouting materials were studied by macroscopic mechanics and microscopic tests. The results show that the optimal volume fraction of SF alone is 1.5%, and the mortar performance is the best when SF and nano-Al₂O₃ are 1.5% and 2.0%, respectively. At 28 days, the compressive strength, flexural strength and fracture energy of the compound doping increased by 23.08%, 34.55% and 12.10%, respectively. Both the plastic viscosity and the yield stress increased with the increase of SF and nano-Al₂O₃ content. Microstructure analysis of the composite grouting material showed that more C-(A)-S-H gels were produced, the porosity was reduced, and the matrix became denser than the reference group.

Key words： gangue powder steel fiber nano alumina fracture property rheological property

Published: 10 August 2025 Online: 2025-08-13

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TU528

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	Articles by authors
	YANG Zhenghui
	ZHU Tao
	ZHANG Dongsheng
	YANG Qiuning
	MAO Mingjie

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YANG Zhenghui,ZHU Tao,ZHANG Dongsheng, et al. Study on the Properties of Nano-Al₂O₃ and Steel Fiber Composite Reinforced Geopolymer Grouting Materials[J]. Materials Reports, 2025, 39(15): 24050076-11.

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https://www.mater-rep.com/EN/10.11896/cldb.24050076 OR https://www.mater-rep.com/EN/Y2025/V39/I15/24050076

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