A review of recycled micro-powder concrete: material treatment, performance and mechanism

Recycled micro-powder (RP), composed primarily of recycled concrete powder and recycled brick powder derived from construction and demolition waste, has emerged as a promising sustainable supplementary cementitious material in concrete production. Owing to its inherent pozzolanic reactivity and micro-filler effect, RP contributes to refining pore structures and enhancing both the fresh and hardened properties of cement-based materials. This review provides a comprehensive overview of the physicochemical characteristics and hydration potential of RP, critically evaluating its effects on workability, mechanical performance, and durability. Furthermore, the environmental and economic implications of RP utilization are discussed, emphasizing its potential to reduce energy consumption, lower carbon emissions, and conserve natural resources. Finally, key research gaps are identified, and future directions are proposed to advance the practical application of RP in developing low-carbon, sustainable concrete.