摘要
为了将固废聚合物改良高液限土作为填料更好地应用于上路堤或路床工作区,该文利用工业固体废弃物(粉煤灰、钢渣等)制备胶凝聚合物和水泥传统改良材料,并与改良高液限土进行对比,研究其力学特性及经济效益。通过液塑限试验、室内击实试验、收缩试验、_(CBR)试验以及干湿循环试验,研究固废胶凝聚合物改良高液限土的力学性能及其浸水稳定性与耐久性,并探讨其改良机理,进一步系统分析了固废掺量、干湿循环次数、压实度等因素对改良高液限土力学特性的影响。试验结果表明:随着固废掺量的增加,改良高液限土的塑性指数和液限明显降低,收缩系数大幅减小;压实度为96%,并掺入3%固废改良土的R_(CBR)值与干湿循环15次的R_(CBR)值均满足《公路路基设计规范》(JTG D30—2015)要求,且在循环期间虽出现细小裂缝并未贯穿试样;对于其经济效益,接近等强度条件下,3%水泥与4%固废填料消耗固废比水泥低23.8%,降低了施工成本;高液限土经过固废聚合物改良后具有较好的路用力学性能,可以将其作为填筑材料用作上路堤和路床。
To improve the application of the solid waste polymer-modified high liquid limit soil as filler in the upper embankment or road bed work area,this study prepared colloidal polymer and improved materials of traditional cement by using industrial solid waste(fly ash,steel slag,etc.)and compared them with the improved high liquid limit soil to investigate its mechanical properties and economic benefits.The mechanical properties of high liquid limit soil improved by the colloidal polymer of solid waste,as well as its stability and durability when immersed in water were studied through a liquid-plastic limit test,a laboratory compaction test,a shrinkage test,a California bearing ratio(_(CBR))test,and a dry-wet cycle test,and the improvement mechanism was analyzed.The effects of solid waste content,number of dry-wet cycles,and compaction degree on the mechanical properties of improved high liquid limit soil were analyzed.The results show that with the increase of solid waste content,the plastic index and liquid limit of improved high liquid limit soil decrease obviously,and the shrinkage coefficient drops greatly.The R_(CBR) value of the improved soil with the compaction degree of 96%and solid waste of 3%and the R_(CBR) value after the dry-wet cycles for 15 times correspond with Specifications for Design of Highway Subgrades(JTG D30—2015),and only small cracks appear during the cycle period and do not run through the sample.In terms of economic benefits,the consumption of solid waste from the use of 3%cement and 4%solid waste filler is 23.8%lower than that of cement under nearly equivalent strength conditions,saving construction costs.The high liquid limit soil improved by solid waste polymer demonstrates good mechanical properties and can be used as the filling material of the upper embankment and road bed.
作者
张亚飞
覃雅澜
伍嘉诚
张锐
高英力
祝张煌
李露
ZHANG Yafei;QIN Yalan;WU Jiacheng;ZHANG Rui;GAO Yingli;ZHU Zhanghuang;LI Lu(School of Transportation,Changsha University of Science&Technology,Changsha,Hunan 410114,China;National Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment,Changsha University of Science&Technology,Changsha,Hunan 410114,China)
出处
《中外公路》
2025年第6期94-101,共8页
Journal of China & Foreign Highway
基金
国家自然科学基金资助项目(编号:52278432)
海南省地方标准修订项目(编号:2021-Z043)
长沙理工大学本科生开放基金资助项目(编号:kfjbks202308)。
关键词
路基工程
高液限土改良
固废胶凝聚合物
R_(CBR)强度
干湿循环耐久性
经济性分析
subgrade engineering
high liquid limit soil improvement
colloidal polymer of solid waste
R_(CBR)strength
durability of dry-wet cycle
economic analysis
