不同温湿度下聚合物与硫铝酸盐水泥的长期协同作用机制

With the increasingly serious environmental pollution pressure, sulphoaluminate cement gradually attracted attention by its low carbon characteristics and high development potential. The development of sulphoaluminate cement based functional materials mostly needed to be incorporated by polymer, but so far the related researches are still confined to its early performance at room temperature. Exploration of long-term performance and related scientific problems of polymer/sulphoaluminate cement composite cementitious material under various temperatures and relative humidities is necessary for the evaluation of the reliability of this kind of material, which has important scientific significance. This project will choose sulphoaluminate cement mixing with styrene-butadiene rubber copolymer as the research object, to study the development of long-term performance and microstructure of polymer/sulphoaluminate cement under various temperature and relative humidity environments, and to establish the quantitative relationship between long-term performance and microstructure evolution. By tracking the cement hydration process, hydration product transformation, polymer structure evolution, interaction between phases and its influence on the microstructure of the material, the project will clarify the composite cementing mechanism and long-term synergistic effect mechanism between polymer and sulphoaluminate cement. The research results of the project will provide theoretical basis for the formulation of sulphoaluminate cement based functional materials with long-term stable performance under various environmental conditions, the development of the application fields of sulphoaluminate cement, and the promotion of green and functionalization of cement-based materials.

随着环境问题日趋严重，硫铝酸盐水泥以其低碳特性和高开发潜质逐渐引起人们重视，而硫铝酸盐水泥基功能材料的开发大多需要掺入聚合物，但迄今相关研究仍仅局限于常温下早期性能。探索不同温湿度下聚合物/硫铝酸盐水泥的长期性能及相关科学问题，对评估该类材料的可靠性十分必要，具有重要科学意义。本项目将掺入丁苯共聚物的硫铝酸盐水泥作为研究对象，以温度和湿度同时变化作为主要实验条件，研究聚合物/硫铝酸盐水泥长期间内的宏观性能发展和微观结构演变及其定量关系。通过跟踪聚合物/硫铝酸盐水泥的水化过程、水化产物的种类转化、聚合物的结构演化、相与相之间的相互作用程度及其对复合胶结体微观结构的影响，阐明聚合物和硫铝酸盐水泥的复合胶结硬化机理及长期协同作用机制。为配制在不同温湿度变化下性能长期稳定的硫铝酸盐水泥基功能材料，拓展硫铝酸盐水泥的应用领域，推动水泥基材料的绿色化和功能化提供理论基础。

随着环境问题日趋严重，硫铝酸盐水泥以其低碳特性和高开发潜质逐渐引起人们重视，而硫铝酸盐水泥基功能材料的开发大多都需要掺入聚合物，但以往相关研究仅局限于常温下早期性能。探索不同温湿度下聚合物/硫铝酸盐水泥的长期性能及相关科学问题，对评估该类材料的可靠性十分必要，具有重要科学意义。本项目以温湿度变化作为主要实验条件，研究获得了丁苯共聚物/硫铝酸盐水泥复合胶凝材料在不同温湿度条件下长期间内物理力学性能的发展规律，并结合微观结构演变阐明了聚合物和温湿度的作用机理，同时发现不同温湿度下丁苯共聚物均能改善硫铝酸盐水泥砂浆的物理力学性能。对比了三种聚合物对硫铝酸盐水泥砂浆物理力学性能和耐久性的影响以及对硫铝酸盐水泥水化的影响差异。通过跟踪聚合物/硫铝酸盐水泥的水化进程、水化产物的种类转化、聚合物的结构演化、相与相之间的相互作用及其对复合胶结体微观结构的影响，阐明了聚合物和硫铝酸盐水泥的复合胶结硬化机理及长期协同作用机制，建立了不同温湿度下聚合物改性硫铝酸盐水泥的水化产物和微观结构演变模型。为配制在不同温湿度变化下性能长期稳定的硫铝酸盐水泥基功能材料，拓展硫铝酸盐水泥的应用领域，推动水泥基材料的绿色化和功能化奠定了基础。