贝利特-硫铝酸钙(C4A3$)水泥具有显著的低碳与节能特性，针对该水泥中期力学强度低和硫排放污染问题，本项目以硫硅酸钙（C5S2$）为中期强度组分，基于诱导成核促使C4A3$低温形成的新思路，一步实现贝利特-C5S2$-C4A3$新型水泥熟料矿物共存，并从源头上杜绝硫的高温分解。着重研究：（1）阐明铝酸钙(C12A7、CA)等诱导成核作用对C4A3$形成过程的影响，优选出最佳低温成核路径，建立C4A3$低温形成的动力学方程;（2）调控贝利特-C5S2$-C4A3$熟料组成，并以煅烧分解形成成核剂的固体废渣作为促进剂，研究该熟料矿物相的低温共存机制、硫的存在形式;（3）探索熟料矿物组成的匹配与水化硬化性能间的相互关系。从而揭示该熟料的低温形成机制，确立最优组成匹配，优化中期性能。研究成果将为低硫排放新型贝利特-C4A3$水泥熟料制备奠定应用基础。

Belite-calcium sulphoaluminate (C4A3$) cement has significant low carbon and energy saving features. However, low mid-term mechanical strength and sulfur emission pollution problem of belite-C4A3$ cement limited their applications. To overcome these problems, in this project, calcium sulphosilicate (C5S2$) will be used as a mid-term strength component, and based on the new idea of inducing nucleation to promote the formation of C4A3$ at low temperature, one step form the new type belite-C5S2$-C4A3$ cement clinker.Moreover, the decomposition of sulfur at high temperature will be eliminated from the source. The main research contents include (1) to elucidate the influence of calcium aluminate (C12A7, CA) and other nucleation on the formation process of C4A3$, select the best path of nucleation at low temperature, and establish the kinetic equation of C4A3$ formation at low temperature; (2) to adjust the composition of belite-C5S2$-C4A3$ clinker, and study the coexistence mechanism of the clinker minerals at low temperature and the existed form of sulfur using solid waste residue ( which can be decomposed into nucleating agent when calcination) as an accelerant; (3) to explore the relationship between the clinker mineral composition and the cement hydration- hardening properties. This project is expected to reveal the mechanism of low temperature formation of the clinker, establish the optimal composition matching, and optimize the mid-term performance of this cement. The research results will provide guidance for preparation and application of low sulfur emission belite-C4A3$ cement.