为解决传统粉煤灰混合水泥砂浆早期强度发展缓慢、孔隙结构粗化等问题。通过共沉淀法合成了聚羧酸盐改性水化硅酸钙（C-S-H/PCE）纳米复合材料，并采用多种表征对其结构进行分析。深入探究其对粉煤灰混合水泥砂浆早期力学性能、孔隙结构、水化动力学和水化产物的影响。结果表明：掺加C-S-H/PCE能够有效提高砂浆的早期抗压强度，且其抗压强度增长率与C-S-H/PCE掺量成正比；随着养护龄期的延长，抗压强度增长率减缓；C-S-H/PCE能够显著降低砂浆试样的孔隙率，并减小砂浆中的大孔比例，从而起到提高水泥砂浆的致密性，细化孔隙结构的作用；C-S-H/PCE能够促进水泥浆体的早期水化，提高浆体的早期水化程度且C-S-H/PCE掺量越高，促进效果越明显；C-S-H/PCE不仅有效促进了水泥生成更多的水化产物，加速了整个水化进程，而且这一过程并未改变水化产物的种类组成，确保了水泥性能的稳定性与可控性。未来研究可进一步聚焦于优化C-S-H/PCE的制备工艺，探索其在不同种类水泥及掺合料体系中的适用性，以及其对水泥基材料长期耐久性的影响机制。同时，结合先进的计算模拟技术，深入揭示C-S-H/PCE纳米复合材料与水泥基体间的相互作用机理，为开发高性能、长寿命的水泥基材料提供理论基础和技术支撑。

In order to solve the problems of slow development of early strength and coarsening of pore structure of traditional fly ash mixed cement mortar，polycarboxylate modified calcium silicate hydrate（C-S-H/PCE） nanocomposites were synthesized by co-precipitation method，and their structures were characterized by various microscopic testing methods.Its effects on the early mechanical properties，pore structure，hydration kinetics and hydration products of cement mortar were deeply explored.The results showed that the addition of C-S-H/PCE could effectively improve the early compressive strength of mortar，and the growth rate of compressive strength was proportional to the content of C-S-H/PCE.When curing age was increased，the growth rate of compressive strength was decreased.C-S-H/PCE could significantly reduce the porosity of mortar samples and reduce the proportion of macropores in mortar，so as to improve the compactness of cement mortar and refine the pore structure.C-S-H/PCE could promote the early hydration of cement paste and improve the early hydration degree of cement paste.The higher the content of C-S-H/PCE，the more obvious the promotion effect.C-S-H/PCE not only effectively promoted the formation of more hydration products of cement and accelerated the whole hydration process，but also this process did not change the composition of hydration products，which ensured the stability and controllability of cement performance.Future research could focus on optimizing the preparation process of C-S-H/PCE，exploring its applicability in different types of cement and admixture systems，and its influence mechanism on the long-term durability of cement-based materials.At the same time，combined with advanced computational simulation technology，the interaction mechanism between C-S-H/PCE nanocomposites and cement matrix was deeply revealed，which provided theoretical basis and technical support for the development of high-performance and long-life cement-based materials.