将超声波、高速分散机的物理作用与硅烷偶联剂的化学作用相结合,制备了一种聚天冬氨酸酯聚脲纳米复合材料。采用激光粒径分析仪（Zetasizer）、扫描电镜（SEM）和红外光谱（FTIR）表征了纳米复合材料的微观结构。当SiO 2纳米粒子用量达到6％时，复合材料的力学性能达到最佳。通过纳米复合材料的耐久性试验发现，纳米复合材料可提高混凝土的抗冻、抗碳化和抗冲磨能力。该纳米复合材料经国家建筑工程质量监督检验中心检验，性能优良，绿色环保。该纳米复合材料在三峡大坝进行了现场生产性试验，情况良好，有望应用于水工混凝土的保护。

In this study, polyurea based on polyaspartic esters nanocomposites were prepared by the combination of the ultrasonic dispersion method, high-speed scattering machine and silane coupling agent. The microstructure of the nanocomposites was characterized by Zetasizer, scanning electron microscope (SEM) and Fourier transform infrared (FTIR) spectra. With a 6% of silica nanoparticles amount in total, mechanic property of SiO 2-polyurea nanocomposites reaches to the best. The durability tests of the nanocomposites were completed. The results of the tests indicate the nanocomposites can significantly enhance the frost-resisting property, anti-carbonating property, as well as abrasion-resistance of hydraulic concrete. The performance of the nanocomposites is excellence and environmentfriendly tested by National Center for Quality Supervision and Test of Building Engineering. The on-site test of the nanocomposites was completed on the Three Gorges Dam and the result of the test is satisfying. The nanocomposites are expected to have promising applications in hydraulic concrete protection.