M-S-H的水化合成及其组成、结构与胶凝性能关系的研究

In response to the gradual reduction of limestone resources, and to promoting the application of magnesian minerals in cement industry, a new type of magnesian cement in which M-S-H (Magnesium Silicate Hydrate) acts as the main cementitious component is developmented in this project. By means of the appropriate testing techniques and characterization methods, the synthesis under the normal temperature and pressure for M-S-H with good cementitious properties is studied. Meantime, the effects of chemical composition, mineral composition and structural state of raw materials, assistant components, curing system and other factors on the hydration reaction are analyzed, and the mechanism and rule of hydration reaction with appropriate reaction rate are investigated. Based on the above, the strength, setting time, consistency and other properties of the M-S-H are researched, and the changing rule of cementitious properties of M-S-H is discussed. Furthermore, the manufacturing method of new magnesian cement in which industrial raw materials are utilized and M-S-H acts as the main cementitious component is studied. The microstructure, macroscopic properties and evolution mechanism of magnesian cement-based materials are analyzed, and theoretical system construction of new magnesian cement in which M-S-H asts as the main cementitious component is discussed. This research has important significance in promoting the development of scientific theory and new technologies of cement-based materials. In addition, due to accelerate the utilization of magnesian minerals in cement industry, project results have clear application prospect and huge market demand.

为应对石灰石原料逐渐减少的资源问题，推进镁质矿产在水泥工业中的应用，课题以发展一种以M-S-H（水化硅酸镁）为主要胶凝组分的新型镁质水泥为导向，借助合适的测试技术与表征方法，对常温常压下水化合成具有良好胶凝性能M-S-H的反应过程进行研究；通过分析原料的化学与矿物组成和结构状态、辅助组分、养护制度等因素对水化合成反应的影响，揭示具有适当反应速率的M-S-H水化合成机理及规律；在此基础上，研究纯M-S-H相的强度、凝结时间、稠度等胶凝性能，分析M-S-H胶凝性能随其组成、结构特征变化的规律，研究利用工业原料制备以M-S-H为主要胶凝组分的新型镁质水泥的途径和方法，对镁质水泥基材料的微结构、宏观性能及其演变机理进行分析，探索建立以M-S-H为主要胶凝组分的水泥理论体系。研究对促进水泥基材料科学的发展具有重要意义；成果将推进镁质矿产在水泥工业中的资源化利用，具有明确的应用前景和广阔的市场需求。

课题组在2013年初设计研究计划时，选取了原申请书中四个主要研究内容中两个关键部分开展研究，对常温常压下M-S-H水化合成方法及技术路线进行探索。研究过程中，课题以工业原材料为研究对象，探讨了具有适当反应速率的M-S-H水化合成反应机理及调控方法，研究了M-S-H的水化合成及其组成、结构与胶凝性能关系等相关问题。课题组完成了上述研究计划，并取得预期的研究结果。在项目的执行过程中，还对以M-S-H为胶凝组分的胶凝材料体系耐久性进行了初步研究，但基于研究时间限制，以及水泥基材料微结构的复杂性及宏观性能的多样性，对以M-S-H为胶凝组分的胶凝材料体系的研究仅仅是初步的分析，需要进一步开展更加深入和系统的研究。