基于再生胶凝固化剂的季冻区路基固化土工程性能研究  

Study on the performance of subgrade stabilized soil in seasonal freezing area based on reutilization cementitious curing agent

作　　者：姜鹏[1] 刘林 邹仁 仝亚刚 张小宁 王帅[1] 郎永贤 JIANG Peng;LIU Lin;ZOU Ren;TONG Yagang;ZHANG Xiaoning;WANG Shuai;LANG Yongxian(School of Civil Engineering,Shandong University,Jinan 250061,China;China Railway No.5 Engineering Group Co.,Ltd.,Guiyang 550003,China;Qinghai Traffic Construction Management Co.,Ltd.,Xining 810021,China)

机构地区：[1]山东大学土建与水利学院,山东济南250061 [2]中铁五局集团有限公司,贵州贵阳550003 [3]青海交通建设管理有限公司,青海西宁810021

出　　处：《铁道科学与工程学报》2025年第2期636-648,共13页Journal of Railway Science and Engineering

基　　金：国家重点研发计划(2022YFB2601900);国家自然科学基金资助项目(52178429,52478456);山东省自然科学基金资助项目(ZR2020UE242)。

摘　　要：为实现工业固废在道路与铁道路基工程中的高值化利用,助力双碳目标在交通运输工程领域中的达成,采用钢渣、矿渣与2种脱硫产物(DP-1、DP-2)等工业固废制备再生胶凝固化剂。基于响应面法考察不同工业固废的交互作用并得到其最优组配。采用最优组配下的固化剂对粉土进行改良固化,并表征本研究固化粉土微观结构。与水泥固化粉土作对比,探究了固化剂掺量、养护龄期对固化粉土力学性能和耐久性的影响规律,并分析2种固化粉土的矿物成分,探究再生胶凝固化剂的粉土固化机理。研究结果表明:7 d无侧限抗压强度(p_(usc))响应面模型经残差正态概率分布检验,模型可靠度较高。钢渣与矿渣、钢渣与DP-2交互作用对7 d p_(usc)值的影响极其显著,再生胶凝固化剂最优配比(%)为钢渣∶矿渣∶DP-1∶DP-2=52.1∶19.9∶19.5∶8.5。研究可知,固化粉土具有良好的力学性能和耐久性,在养护后期(28 d)与水泥固化粉土p_(usc)值、加州承载比值、水稳性能系数值、冻融循环系数值分别相差1.9%、0.5%、1.0%、2.3%。再生胶凝固化剂组分在碱性环境中发挥协同作用,水化产物交错生长填充了粉土颗粒之间的孔隙,从而提高了固化粉土的力学性能。同掺量的再生胶凝固化剂碳排放仅为水泥的1.66%,推荐再生胶凝固化剂路床固化工程最优掺量为6%~8%,该技术的推广应用具有重要环保和社会意义。In order to realize the high-value utilization of industrial solid waste in highway and railway subgrade engineering,and help achieve the dual-carbon goal in the field of transportation engineering,a recycled cementitious curing agent was fabricated using industrial solid waste materials,including steel slag,mineral slag,and two desulfurization products(DP-1,DP-2).The interaction among different industrial solid waste materials were investigated using response surface methodology to determine the optimal mixing ratio.The curing agent with the optimal mixing ratio was used to stabilize silt,and the stabilized silt microstructure was characterized.Cement stabilized silt was selected as a control group to explore the effects of curing agent incorporation and curing age on mechanical properties and durability of the stabilized silt.Besides,the mineral components of the two stabilized silts were analyzed to elucidate the solidification mechanism of recycled cementitious curing agent.The results show that the 7-day(7 d)unconfined compressive strength(pusc)response surface model,validated through the normal probability distribution of residuals,has high reliability.The interactions between steel slag and mineral slag,as well as those between steel slag and DP-2,significantly affects the 7 d pusc value.The optimal mixing ratio of recycled cementitious curing agent(%)was determined to be steel slag∶mineral slag∶DP-1∶DP-2=52.1∶19.9∶19.5∶8.5.The stabilized silt in this study exhibits good mechanical properties and durability;in the post-stage curing period(28 d),the differences of pusc value,California bearing ratio value,water stability coefficient and freeze-thaw cycle coefficient between it and cement stabilized silt were 1.9%,0.5%,1.0%and 2.3%,respectively.The components of the recycled cementitious curing agent synergistically acted in an alkaline environment,and the hydration products intergrew to fill the voids between silt particles,thereby improving the mechanical properties of the stabilized silt.The c

关 键 词：工业固废 响应面法 固化剂 力学性能 耐久性 固化机理 

分 类 号：TU414[建筑科学—岩土工程]