铁道科学与工程学报2025，Vol.22Issue(2)：636-648,13.DOI:10.19713/j.cnki.43-1423/u.T20240549
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
摘要
Abstract
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 carbon emission of the recycled cementitious curing agent was only 1.66%of that of cement at the same incorporation,and the recommended optimal incorporation for subgrade bed engineering of the reutilization cementitious curing agent was 6%～8%.The popularization and application of this technology have important environmental and social significance.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Key words
industrial solid waste/response surface methodology/curing agent/mechanical property/durability/solidification mechanism分类
建筑与水利引用本文复制引用
姜鹏,刘林,邹仁,仝亚刚,张小宁,王帅,郎永贤..基于再生胶凝固化剂的季冻区路基固化土工程性能研究[J].铁道科学与工程学报,2025,22(2):636-648,13.基金项目
国家重点研发计划(2022YFB2601900) （2022YFB2601900）
国家自然科学基金资助项目(52178429,52478456) （52178429,52478456）
山东省自然科学基金资助项目(ZR2020UE242) （ZR2020UE242）
