Objective The application of multi-solid-waste collaborative high-performance low-carbon cementitious materials in suburban railway construction is an effective approach to realize the resource utilization of solid waste and promote green suburban railway development. It is necessary to study the feasibility and necessity of such applications.

Method The energy consumption and carbon emission across the full suburban railway lifecycle are analyzed. Combined with the advantages of solid-waste-based cementitious materials in production cost, carbon emission reduction, and solid waste resource utilization, the feasibility and necessity of applying these materials in suburban railway construction are elaborated. Based on the construction of the Jiaxing-Fengnan and Jiashan-Xitang suburban railway projects in Jiaxing, high-performance low-carbon cementitious materials are developed using slag, steel slag, fly ash, and gypsum as raw materials. Engineering application tests are conducted in typical sections, including shield tail synchronous grouting and soft soil foundation reinforcement.

Result & Conclusion  Replacing cement with multi-solid-waste collaborative high-performance cementitious materials in suburban railway construction can effectively consume large quantities of industrial solid waste, reduce carbon emissions, and save engineering costs, showcasing promising application prospects. However, challenges such as low market awareness and incomplete standards remain in the promotion of this material. Measures such as strengthening publicity, improving standards and regulations, and promoting coordinated industrial development are proposed to overcome barriers, support green metropolitan railway construction, and advance sustainable urban development.