Abstract: To improve the comprehensive utilization rate of manganese tailings and reduce environmental pollution, this study used manganese tailings as raw materials to produce building aggregates through mechanical modification, and C20, C25 and C30 concretes were prepared by fully replacing natural aggregates. The feasibility of manganese tailings concrete (MC concrete) was investigated through mix design, performance testing, and heavy metal leaching toxicity analysis. The experimental results show that: 1) The manganese tailings slag aggregate complies with the Class III requirements of GB/T14684—2022 and GB/T14685—2022. 2) Under full aggregate replacement, the workability of MC is comparable to that of natural aggregate concrete, and its 28-day compressive strength reaches 43.62 MPa. Moreover, it effectively immobilizes heavy metals, resulting in low leaching and minimal environmental impact. 3) Through this approach, critical issues associated with industrial waste disposal and natural resource exploitation can be addressed. The overall cost is reduced by 40%～50%, and the exploitation of natural resources is correspondingly reduced, contributing to the green, environmentally friendly, and economically sustainable development strategy of "carbon peak and carbon neutrality".

Key words: non-metallic materials, manganese tailings, construction aggregates, solid waste resource utilization