Freeze-Thaw Characteristics Study of Slag-Fly Ash Based Geopolymer Stabilized Pb-contaminated Soil
YU Guanglei1, LI Liang1,*, ZHENG Xiyao1, WU Jun2, DU Xiuli1
1 Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China 2 School of Civil Engineering, Shanghai Normal University, Shanghai 201418, China
Abstract: Freeze-thaw cycle will intensify the penetration of the heavy metal lead (Pb) in the contaminated site, and geopolymer can effectively reme-diate lead-contaminated sites. Based on mass loss, unconfined compressive strength (UCS), ion leaching test, and microstructure analysis, the physical and mechanical properties of geopolymer stabilized Pb-contaminated soil under freeze-thaw cycles were studied, and revealed its microscopic mechanism of action. The results indicate that as lead concentration and freeze-thaw cycles increase, the mass loss and strength loss of geopolymer stabilized soil gradually rise, but the rate of strength loss slows and tends to stabilize with more freeze-thaw cycles. The primary cause of performance degradation of stabilized contaminated soil was identified as the widening of pores and cracks. However, geopolymer can still maintain the stabilization rate of lead ions above 99%.
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2026, Vol. 40 
