碱激发粉煤灰-高炉矿渣粉固化铸造废砂用作路基填料研究

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中图分类号：U414 文献标志码：A 文章编号：1005-8249（2025）04-0117-06

DOI：10.19860/j.cnki.issn1005-8249.2025.04.022

CHEN Guangsheng

（Canton One Construction Group Co.， Ltd.，Guangzhou 51OooO，China）

Abstract：Toutilizefoundrywastesandasaroadbasematerialviageopolymerization，thevariationpatersofseting timeand unconfinedcompresivestrengthofthe mixtures were investigatedusinggroundgranulatedblastfurnaceslag（GGBS）powderand flyashascementitious materialsatdiferentdosages，withaNaOHsolutionastheactivator，microstructural morphologyanalysis of the mixtures was alsoconducted.Theresultsshowthatcasting wastesand particles with large particle size，alkaline solution is difficult to stimulate its activity and curing；only 5% fly ash can not make the casting waste sand curing；at the same time， blastingfurnaceslag powder，flyash，geopolymerizationreactioncanoccur；Increase thedosageof blasting furnace slag powder，theconcentrationof alkaline solutioncanshortenthecuring time；Increasethedosageofflyash，willextendthecuring time； 5% of the dosage of fly ash，the dosage of blast furnace slag powder for 15% fly ash dosage，the maximum unconfined compressive strength；Thesameblastfurnace slag powderdosage，thecompresive strength increases withthe increase inflyash dosage；Increase theconcentrationof alkalinesolution，sothat thecompresivestrengthof themixtureisreduced；Mixture maintenance 28d ，you can get about 85% of the compressive strength；Alkali excitation of blast furnace slag powder，fly ash can beproduced inlargequantities to produce agel，filing andcompacting ofcastingsand particles betweenthe poresto

improve thecompactnessof themix，whilegeneratingzeolitecrystals，whichtogethercanproducealarge amountof gel，filng andcompactingcastingsandparticlesbetweentheporestoimprovethecompactnessofthemix，while generating zeolitecrystals. Atthe same time，zeolitecrystalsaregenerated to improvethecompressivestrength of the mixture.Theresearchresultscan provide theoretical basis for the casting waste sand used as roadbed filler.

Key words：roadbed engineering；casting waste sand； alkali excitation； industrial waste residue；roadworthiness

0 引言

石英砂为铸造模具的主要材料，铸造石英砂在循环使用中发生质量损失后无法继续使用成为铸造废砂，我国每年在铸件生产过程中产生铸造废砂超过5000万 t[1-2] 。（剩余6535字）