湖南大学学报（自然科学版）2026，Vol.53Issue(5)：77-88,12.DOI:10.16339/j.cnki.hdxbzkb.2026044
碱-硫酸根激发淤泥流态固化土强度与微观结构分析
Strength and microstructural properties of alkali-sulfate activated sludge fluid-solidified soil
摘要
Abstract
Compared to traditional cement solidification technology,alkali-sulfate composite activation solidification offers advantages such as low energy consumption and high resource recycling rates.However,its practical solidification effects and environmental adaptability in sludge solidification applications require further investigation.In this study,alkali-sulfate composite activation technology was employed to prepare sludge fluid-solidified soil,using ground granulated blast furnace slag as the alkali-activated material and flue gas desulfurization gypsum as the sulfate source.Tests,including unconfined compressive strength,direct shear,splitting,and wet-dry cycles,were conducted.Additionally,scanning electron microscopy(SEM)and X-ray diffraction(XRD)analyses were performed to examine the macro-mechanical properties,microstructural evolution,and solidification mechanisms.The results show that composite fluid-solidified soil significantly outperforms cement-based fluid-solidified soil in key indicators such as compressive strength,shear strength,wet-dry cycle resistance,and splitting tensile strength.It also exhibits lower porosity,average pore area,and probability entropy,along with a higher area probability distribution index,indicating a denser and more uniform pore structure.The alkali-sulfate composite activation technology accelerates the conversion of calcium hydroxide(CH)to calcium silicate hydrate(C-S-H)and calcium aluminate hydrate(C-A-H)through the synergistic action of alkali and sulfate ions.This forms a dense cementation network,improving the soil's density and mechanical strength.This study provides both theoretical and practical insights for the application of alkali-sulfate composite activation solidification in sludge treatment.关键词
水泥固化土/淤泥流态固化土/碱-硫酸根复合激发/宏观性能/微观结构Key words
cement-based solidified soil/sludge fluid-solidified soil/alkali-sulfate composite activation/mac-roscopic performance/microstructure分类
建筑与水利引用本文复制引用
张玲,叶虔江,周智游..碱-硫酸根激发淤泥流态固化土强度与微观结构分析[J].湖南大学学报（自然科学版）,2026,53(5):77-88,12.基金项目
国家自然科学基金资助项目(52078205,52108317),National Natural Science Foundation of China(52078205,52108317) （52078205,52108317）
湖南省自然科学基金资助项目(2020JJ3013),Natural Science Foundation of Hunan Province(2020JJ3013) （2020JJ3013）
