English：

Based on the resource recovery technology of waste concrete, recycled aggregates and recycledfine powder are produced, and they are used to replace quartz sand and cement to manufacture low⁃carbon ultra high performance concrete (UHPC). Through mechanical experiments and carbon reductionresearch, the results indicate that the replacement of quartz sand with recycled aggregate ( < 30%)results in a limited reduction in UHPC compressive strength. Regenerated fine powder (<25%) replacescement, and the reduction in UHPC compressive strength is limited. If the content exceeds 25%, it willreduce the working performance and compressive strength of the UHPC matrix. By mixing recycledaggregate and recycled fine powder ( < 5%), the compressive strength of UHPC remains unchanged.While maintaining the basic mechanical properties of UHPC, recycled fine powder (<25%) can replacecement or recycled aggregate (< 30%) instead of quartz sand. In the production stage, the cost of UHPCcan be reduced by more than 5% per unit. Considering government subsidies for recycled materials andeconomic carbon reduction indicators, the cost can be reduced by up to 10%. Regenerated fine powder( <25%) can replace cement and reduce carbon emissions by 15% per unit during the production stage.Therefore, using recycled materials to produce low⁃carbon UHPC can effectively reduce the productioncost and carbon emissions, facilitate the promotion of UHPC, and assist in ecological construction.