我国每年建筑废弃物排放量巨大，但是综合利用率不足10%。全国城市化建设和生态文明建设要求进一步提高建筑废弃物的综合利用水平。再生细粉是建筑废弃物破碎后小于0.16mm的粉末，具有复杂的化学组成、粗糙的形貌、不稳定的颗粒级配以及较高的吸水率等特征，综合利用难度大。本项目根据再生细粉的物理特性及化学活性，建立其性能评价体系。明晰再生细粉物相组成、颗粒级配、掺量及活性对水泥基材料流变性能时变规律的影响，建立水泥基材料流变模型。运用颗粒堆积理论及富余浆体理论，揭示再生细粉颗粒堆积与水泥基材料屈服应力、塑性黏度及水膜层厚度的相关性。同时，明晰外加剂与再生细粉的交互作用机制，揭示外加剂的调控机制，实现运用外加剂优化及配合比调整的方法，形成快分散、高保坍、高稳健的施工性能调控方法。最后，从水泥基材料的力学性能、耐久性能、体积稳定性及水化微结构演变规律，形成基于流变性能调控的制备工艺评价体系。

There is a great quantity of construction waste produced annually in China, but only less than 10% of them can be reused as recycled products. The National urbanization and ecological civilization requires further improvement of the comprehensive utilization of construction waste. Recycled powder is the particle less than 0.16mm after crushing the construction waste, which has the characteristics of complex chemical composition, rough morphology, unstable particle size grade and high water absorption. So that the recycling of recycled powder has faced with a lot of difficult challenges. In this project, the performance evaluation system is established according to the physical characteristic and chemical activity of recycled powder. The influence of composition, grain size, replacement and chemical activity of recycled powder on the rheological properties of cement-based materials as hydration time is comprehensively investigated, so as to establish the rheological model of cement-based materials. Based on the theory of particles agglomerate and surplus paste, the relationship between the packing of fine powder and the rheological factors will be established, such as yield stress, plastic viscosity and the excess water film thickness. In addition, the interaction between the admixture and recycled powder is seriously ascertained to reveal the regulation mechanism of the admixture, so as to propose a control method for achieving construction performance of cement-based materials with the fast dispersion, high slump and high stability by the admixture optimization and mixture proportion adjustment. Finally, based on the comprehensive properties of cement-based materials, such as mechanical properties, durability, volume stability and the evolution of hydration microstructure, an evaluation system of the preparation process considering the rheological property control is proposed.