碱激发粉煤灰－炉渣协同水泥固化水库清淤底泥试验研究

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关键词：水库清淤；底泥；固化；粉煤灰；炉渣；力学性能；浸出毒性中图分类号：X705 文献标识码：A 文章编号：1008-9500（2025）07-0023-05DOI：10.3969/j.issn.1008-9500.2025.07.07

Experimental Study on Reservoir Dredged Sludge Solidified with Alkali Stimulated Fly Ash-Slag and Cement

DENG Jingwen，WUXu （SchoolofEnvironmentalScience&Engineering，HuazhongUniversityofcienceandTechnology，Wuhan43O74，China）

Abstract：Flyash，slagandsodiumhydroxidewereutilized tocurereservoirdesiltingsubsoilwithasmallamountofcement insynergy，andtheectsofthedosageandproportionoflyash，slagandsoiumhdroxideonthemechanicalpoprties andleaching toxicityofreservoirdesilting subsoil were investigated，as wellas the microscopiccuring mechanism.The resultsshowed that the optimal dosages of fly ash，slag and calcium hydroxide were 7.5% ， 12.5% and 0.75% ，respectively， and the 28 d unconfined compressive strength of thecured soil under this ratio was 2.856 MPa，and the curing rate of the six pollutant elements，including Pb and As，was more than 90 % .The micro-morphological analysis showed that the curing agenthadahydrationreaction inthe specimen，which producedcalcium silicate hydrate（C-S-H），calciumaluminate hydrate （C-A-H），andcalciumalumina （AFt），which filledtheporesofthesoilbodyandenhancedtheinter-particle connection，andefectivelyimprovedthestrengthofthesoilbody.Atthesametime，these hydrationproductscured heavy metal ions through the pathways of adsorption，complexation，and substitution.

Keywords： reservoir dredging; sludge; curing; fly ash; slag; mechanical properties; leaching toxicity

我国河湖库资源丰富，每年开展的清淤工程将会产生大量底泥，这些淤泥常被用作生态修复、土方回填和绿化种植等[1-3]，未经固化处理的淤泥力学性能差，含有的重金属等污染物还有可能带来生态风险[4。（剩余5369字）