In order to solve the problems of heavy metal and organic compound pollution and low cement strength under high pollution levels,slag geopolymer was used to gradually replace cement to solidify heavy metal Zn2+ and phenol compound polluted soil.The effects of curing age,pollution concentration and slag geopolymer content on the unconfined compressive strength of solidified soil were analyzed and studied.The solidification mechanism was analyzed by scanning electron microscopy and X-ray diffraction.The test results show that the incorporation of geopolymer significantly improves the unconfined compressive strength of cement-stabilized soil.When 80%cement is replaced,the compressive strength of solidified soil with pollution concentration I at 28 d reaches 1.375 MPa.The number of hydration products increased at the extension age,and the pores in the solidified soil were filled.The compressive strength of the solidified soil at 28 d age was 1.26～22.72 times that of the solidified soil at 7 d age.When the pollution concentration increased from I to III,the formation conditions of cementation hydration products were destroyed.The decrease in the number of products made the structure cementation worse,and the compressive strength decreased.The tetragonal sodium zeolite and clinocalcite produced by hydration made the structure compact and improved the integrity,and increased the compressive strength.
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