硫铝酸钡钙水泥具有突出的快硬早强、防腐抗渗和水化微膨胀等优良特性，更适于沿海建筑、离岸岛礁和深海隧道等特种海洋工程的快速建设和修补加固，但是其主导矿物硫铝酸钡钙(C4-xBxA3s)的晶体结构尚未精确表征、水化性能相异机理(Ba/Ca摩尔比不同)尚未系统阐明，使得此水泥的生产和使用过程不能实施准确分析和有效调控，困扰其广泛应用。鉴于此，本项目在前期研究硫铝酸钡钙合成的基础上，基于精确的Rietveld/XRD方法，结合物理、化学、晶体学、X射线学及水泥混凝土科学等理论，拟开展下列研究内容：C4-xBxA3s 的量化表征与晶体结构模拟；晶型转变与高温分解过程晶相的组成和结构的演变规律；Ba/Ca对C4-xBxA3s矿物的水化行为的调控机制；矿物的本征水化模型与外因素影响下的水化硬化机理。为揭示硫铝酸钡钙的结构和性能并实施有效调控，进而优化硫铝酸钡钙水泥使用效能提供理论基础。

The calcium barium sulphoaluminate cement has such advantages as faster hardening, higher early-strength, better anti-corrosion and anti-permeability, hydrated volumetric microexpansion and so on. It was shown better adaptability of rapid construction and repairing-strengthening of specific ocean engineering such as coastal constructions, offshore islands and deep-sea tunnels. But the calcium barium sulphoaluminate (abbr. C4-xBxA3s) as the main mineral of that cement was not fully characterized and elucidated in respect of crystal structure and hydration properties with various Ba/Ca ratios. That disadvantages restricted the accurate analysis and effective regulation of the calcium barium sulphoaluminate cement production and application. In view of that background, this project, on the basis of the previous research about C4-xBxA3s synthesis, will carry out the following contents supported by Rietveld/XRD refined method and theories of Physics, Chemistry, Crystallography, X-ray Optics, Cement and Concrete. The quantitative characterization and crystal structure simulation of C4-xBxA3s are given the priority to be investigated based on Rietveld/XRD method. And the evolution of mineralogical composition and the crystal structures will be thereafter studied during the process of crystal transition and decomposition of C4-xBxA3s. The regulation mechanism exerted by Ba/Ca on C4-xBxA3s hydration behavior is going to be studied with quantitation of hydration products and ion concentration at certain hydration time. And the intrinsic hydration model and hydration-hardening mechanism influenced by external factors will be finally illuminated. It is expected that these studies could reveal the crystal structure and properties of C4-xBxA3s as well as its effective regulation, thus making theoretical foundation for optimizing the performance of the calcium barium sulphoaluminate cement.