碱激发材料是目前最具发展潜力的绿色胶凝材料之一。碱激发粉煤灰/矿渣复合体系比碱激发单一体系在工程性能上更具优势，但由于粉煤灰、矿渣等原材料性质波动较大，难以控制，复合体系反应机制尚不明确，极大限制了其工业应用。本项目拟在系统研究原材料的粒径分布和各活性成分（SiO2、Al2O3、CaO、MgO）的含量与配比、碱激发剂掺量等因素对碱激发反应进程、反应产物、微观结构及宏观性能影响的作用机制的基础上，通过优化浆体初始颗粒的堆积状态和各活性成分反应进程来从物理、化学两方面调控复合体系中反应产物的组成、结构与孔隙分布，获得宏观性能优异的碱激发材料。在建立碱激发粉煤灰/矿渣复合体系初始组成的优化匹配原则的同时，揭示其反应动力学过程与微观结构演化规律。本研究将为工业废渣在碱激发材料中的科学高效利用奠定理论基础，是一项推进混凝土行业节能减排和低碳发展的重要基础研究工作。

Alkali-activated material is a promising building material with a great potential for sustainable development. The alkali-activated fly ash/slag blended system presents a better engineering performance, compared to the single alkali-activated system. However, the quality of the raw material, i.e. fly ash and slag, is variable and difficult to control; further, the reaction mechanism of the fly ash/slag blended system is unclear, which together limit the industrial application of this material. In this project, the effect of the particle size distribution, content and weight proportion of the active constituent (SiO2、Al2O3、CaO、MgO) in the raw materials and the activator content on the alkali-activated fly ash/slag blended system are studied with respect to the reaction process, reaction products, microstructure development and engineering properties. Based on this knowledge, the composition and structure of the reaction products, as well as the pore size distribution of the alkali-activated fly ash/slag blended system is optimized by adjusting the initial packing density and reaction process of the fly ash and slag, in order to obtain an alkali-activated material with excellent engineering property. This project will provide the optimization principle for mixture design of alkali-activated fly ash/slag blended system. Meanwhile, the reaction kinetics and microstructure evolution process of alkali-activated fly ash/slag blended system are revealed. In this project, the theoretical basis for the efficient utilization of industrial by-products in alkali-activated material is provided. Further, this project is an important fundamental study for promoting the energy saving, resources conservation and emissions reduction of concrete industry and low-carbon economic development.