矿渣基胶凝材料固化电厂无机软化污泥机理及配合比优化研究

doi:10.11896/cldb.25020130

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Abstract In order to address the challenges in stabilizing and utilizing inorganic softened sludge from power plants characterized by high moisture content, elevated calcium ion concentration, and strong alkalinity, thiswork employed alkali-activated slag-based cementitious materials for sludge solidification. Through systematic analysis of the intrinsic relationship between binder dosage and unconfined compressive strength, elucidated the stabilization mechanism of slag-based cementitious materials. The response surface methodology was implemented to optimize the solidification formula while investigating significant interaction mechanisms among raw material components. The results showed that the influence of different raw material content oncompressive strength of solidified sludge varies greatly. With the increase of granulated blast furnace slag content, the strength of solidified sludge increases significantly, while the effect of sodium hydroxide content on the strength is not significant. The change of raw material content affectes the formation ratio of hydration products such as calcium silicate aluminate hydrate(C-A-S-H) and sodium silicate aluminate hydrate(N-A-S-H), thus affecting the strength development. When the content of sodium hydroxide is 2.5%, the optimal mixing ratios of granulated blast furnace slag, fly ash and sodium silicate are 29.57%, 20% and 5.62%, respectively. Their unconfined compressive strength in 7-days reaches 4.10 MPa. The interaction between granulated blast furnace slag content and fly ash content is significant, and the same is true between fly ash content and sodium silicate content. The findings can provide theoretical reference for the application of slag based cementitious materials to solidify sludge in road base materials.

Key words： curing agent compressive strength inorganic softening sludge response surface method mix ratio

Published: 25 February 2026 Online: 2026-02-13

CLC number:

TB332

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	Articles by authors
	MA Chaoyi
	ZHU Chao
	GUO Xin
	LIU Chao

Cite this article:

MA Chaoyi,ZHU Chao,GUO Xin, et al. Research on the Mechanism and Mix Proportion Optimization of Inorganic Softening Sludge in Power Plants Solidified with Slag Based Cementitious Materials[J]. Materials Reports, 2026, 40(4): 25020130-8.

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https://www.mater-rep.com/EN/10.11896/cldb.25020130 OR https://www.mater-rep.com/EN/Y2026/V40/I4/25020130

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