本项目面向废弃混凝土再生微粉(Recycled Concrete Powder, RCP)高值化利用及混凝土制品免蒸养技术发展的双重迫切需求，提出精细化利用RCP中水化产物组分制备纳米晶种及其诱导水化实现免蒸养早强的研究思路：采用机械力-化学协同作用，选择性解离微粉颗粒，建立基于RCP组分的纳米化控制原则，实现水化产物组分的纳米化制备和微结构优化；采用高分子表面修饰及电荷干预，钝化纳米粒子表面结构并提供反团聚高密度电荷，同时建立钝化结构再激活的化学干预机制，构筑同时兼顾储运高稳定性和使用高活性的功能表面，攻克纳米粒子易团聚、易失活的共性难题；探明RCP纳米晶种作用下水泥水化的成核、生长过程，提出基于RCP纳米晶种诱导水化的免蒸养早强设计方法，构建RCP制备纳米晶种及其应用的理论基础。项目研究将开辟RCP高值化利用的新途径、开拓装配式构件等混凝土制品免蒸养设计的新思路。

Based on urgent demands of both high-value utilization of Recycled Concrete Powder (RCP) and development of free of steam curing for precast concrete, it is proposed that nano nucleation seeds prepared from hydration products in RCP would be employed to induce cement hydration to achieve high early strength without any steam curing. Firstly, mechanical force and chemical intervention would be adopted to selectively dissociate RCP particles, followed by establishing a principle based on RCP components to control the nano particles in the system. In this way, the hydration products in RCP would be grinded into nano particles and the microstructure would be optimized. Furthermore, polymer surface modification and charge intervention would be used to passivate active sites on the surface of nanoparticles and provide anti-agglomeration high-density charge. At the same time, a chemical intervention mechanism for reactivation of passivation structure would be established. Based on this, functional surface of nano particles would be constructed and the slurry would achieve high stability in transportation and storage and high activity in its use. The functional surface would overcome the common problem that nanoparticles are easy to agglomerate and easily deactivated due to high surface activity. Moreover, the nucleation formation and its growth process in cement hydration with addition of RCP-based nucleation seed system would be revealed. One new view that addition of RCP-based nucleation seed system to achieve high early strength with free of steam curing would be proposed for further development of precast concrete. One theoretical basis of preparation and application of RCP-based nucleation seed would be given. The results obtained in this proposal would develop one new way for high value utilization of RCP and guide the development of the free of steam curing technology in precast concrete.