生石灰激发地质聚合物固化土剪切特性试验研究

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中图分类号：TU447 文献标志码：A 文章编号：1008-0562（2025）05-0568-10

HUJianlin，YANGWenlong，ZHOU Yongxiang，etal.Experimental studyonshear propertiesofquicklime-stimulated geopolymer solidifiedsoilJ].JouralofiaoingTechicalUniversity（NaturalSience）544（5）：68-57O：10.56j.ss 0562.20250058

Experimental study on shear properties of quicklime-stimulated geopolymer solidified soil

HU Jianlin1²，YANG Wenlong1，ZHOU Yongxiang²，LENG Faguang，DU Xiuli²

（1.College of Civil Engineering， Hebei University ofArchitecture， Zhangjiakou 075ooo， China;2.NationalKeyLaboratory of Bridge SafetyandResilience，Beijing University ofTechnology， Beijing 10o124， China;3. China Academy of Building Research Company Limited， Beijing 100124， China）

Abstract：To enhance the shear strength of soil，geopolymers were prepared using quicklime as the alkaline activatorandused to solidify thesoil.The influence laws of the dosage of quicklime，the mass ratio of blast furnace slag toflyash，the dosage of solidifying agent，and the curing age on the shear strength of geopolymersolidified soil were studied through direct shear tests.The microstructure of the soil was studied by scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. The results show that the dosage of quicklime has a significant threshold effect on the shear strength of geopolymer solidified soil. When the dosage of quicklime is 10% ，the shear strength of the soil reaches the peak.With the increase of the mass ratio of blast furnace slag toflyash，the shear strengthof the soil graduall increases.Withthe increaseof the dosageof the curing agentand the extensionof the curing age，thecohesion and shear strength of thesoil gradually increase， and the internal friction angle shows a changing trend of first increasing and then tending to stabilize.Adding an appropriate amount of quicklime can promote the polycondensation reaction，generating a large amount of C-A-SH gel，thereby improving the soil structure and enhancing the soil strength.The research results can provide a reference for the application of quicklime-activated geopolymer solidified soil.

Keywords： direct shear test; geopolymer solidified soil; shear properties; microstructure; polymerizate; quicklime

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