固废基土壤胶结料固化淤泥质土耐久性能研究  

Study on the Durability Performance of Solid Waste-Based Soil Solidifiers for Stabilizing Silty Soil

作　　者：邱冰 舒本安 任彦飞 朱茂聪 丘科毅 QIU Bing;SHU Benan;REN Yanfei;ZHU Maocong;QIU Keyi(Foshan Transportation Science and Technology Co.,Ltd.,Foshan Guangdong 528314,China)

机构地区：[1]佛山市交通科技有限公司,广东佛山528314

出　　处：《广东公路交通》2025年第1期67-72,共6页Guangdong Highway Communications

基　　金：长沙理工大学公路养护技术国家工程研究中心开放基金资助项目(kfj230202);湖北工业大学河湖智慧健康感知与生态修复教育部重点实验室开放研究基金(HGKFYBP20)。

摘　　要：固废基固化剂的耐久性一直是软土固化领域近年来的研究热门。本文对比研究了固废基土壤胶结料和水泥固化土在长期标养、海水侵蚀、干湿、冻融等多种环境下的力学性能演变规律,并探究了其微观作用机理。结果表明,胶结料固化土相较水泥固化土具有更优异的耐久性能。相较水泥固化土,胶结料固化土标养一年强度提升135%,海水侵蚀强度提升200%(1年),干湿循环强度提升500%(40次循环),冻融循环强度提升340%(8次循环)。胶结料的水化物主要为水化硅酸钙和钙矾石,标养下固化土结构最密实,宏观表现为固化土的强度最高。海水中的硫酸根离子持续促进了钙矾石的生成,导致其体积膨胀,结构被破坏。干湿(40次)和冻融(8次)均使固化土内部出现更多数量的孔隙和裂纹。经工程应用证实,胶结料搅拌桩28d强度为设计要求的260%~380%。The durability of solid waste-based solidifiers has become a prominent research topic in the field of soft soil solidification in recent years.This study compared and analysed the evolution laws of mechanical property for solid waste-based soil solidifiers and cement-stabilised soil under various environmental conditions,including long-term standard curing,seawater erosion,dry-wet cycles,freeze-thaw cycles.Additionally,the microscopic mechanisms of action were explored.The findings indicated that the solid waste-based soft soil solidifier exhibited superior durability characteristics compared to cement.Specifically,after one year of standard curing,the strength of soil solidifier stabilised soil increased by 135%,in comparison to cement-stabilised soil.Furthermore,the strength after one year of seawater erosion increased by 200%,while strength gains of 500% and 340% were observed for wet-dry cycles(40 cycles)and freezethaw cycles(8 cycles),respectively.The primary hydration products of the soil solidifier include hydrated calcium silicate and ettringite.Under standard curing conditions,the compactness of the solidified soil was maximized,resulting in its highest strength.The continuous promotion of ettringite formation by sulfate ions in seawater resulted in the destruction of the volume expansion structure.The application of dry-wet(40 cycles)freeze-thaw cycles both resulted in the formation of additional pores and cracks within the solidified soil.The results of engineering applications demonstrated that the 28-day strength of the curing agent mixing pile ranged from 260% to 380% of the specified design requirements.

关 键 词：固化剂 固废 软土 耐久性能 

分 类 号：U414[交通运输工程—道路与铁道工程]