青稞秸秆灰改性氯氧镁水泥的抗盐卤侵蚀性能与细微观结构

doi:10.11896/cldb.24050241

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Abstract In order to investigate the resistance of magnesium oxychloride cement (MOC) modified with highland barley straw ash (HBSA), salt brine immersion tests were performed on MOC mortars (MOCM) with different contents of HBSA. The evaluation indicators of salt brine erosion resistance were utilized to characterize the physical and mechanical properties changes of HBSA-modified MOCM under salt brine erosion environment. Through multiscale analysis such as analyzing the apparent morphology, testing the microscopic pore structure, and characterizing the microstructure, the intrinsic reasons of HBSA affecting the salt brine corrosion resistance of MOCM are revealed. The research results show that, contrasting with ordinary MOCM, the salt brine corrosion resistance of MOCM with 10% HBSA significantly increases, which is 21.24% higher than that without HBSA. After salt brine erosion, the open porosity decreases by 4.26%, and the proportion of harmless and less harmful pores increase, while the proportion of harmful and more harmful pores decrease. The most probable pore size diminishes, and the pore structure becomes more refined. The M-S-H gel is generated in hydration product of MOCM with 10% HBSA, which fills up between the five-phase crystals, increasing the compactness of the microstructure and promoting the stability of the five-phase crystals in salt brine erosion environment, thereby enhancing the salt brine erosion resistance of the MOCM.

Key words： highland barley straw ash magnesium oxychloride cement salt brine erosion resistance apparent morphology pore structure microstructure

Published: 10 July 2025 Online: 2025-07-21

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TU528

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	Articles by authors
	ZHANG Yongcheng
	CAO Feng
	ZHENG Mingjie
	LI Shuangying
	OUYANG Hao

Cite this article:

ZHANG Yongcheng,CAO Feng,ZHENG Mingjie, et al. Resistance to Salt Brine Corrosion and Microstructure of Magnesium Oxychloride Cement Modified with Highland Barley Straw Ash[J]. Materials Reports, 2025, 39(13): 24050241-8.

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https://www.mater-rep.com/EN/10.11896/cldb.24050241 OR https://www.mater-rep.com/EN/Y2025/V39/I13/24050241

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