Abstract The interfacial transition zone (ITZ) has long been considered as a zone of weakness in concrete. Many scholars have carried out relatively scattered tentative explorations to improve the performance of ITZ. The application of nanomaterials to enhance ITZ in concrete is a promising research. In order to further study the basic principles and practical applications of this field, it is urgent to systematically sort out the existing results. In this study, the nano-modification of ITZ in concrete is systematically reviewed and summarized. First, this study reviews the microscopic characterization of ITZ, including hydration products, porosity, and microhardness. Then, the influence of nanomaterials on ITZ is reviewed from the view of the above three aspects. Finally, the method and mechanism of the ITZ modified by nanomaterials were preliminarily clarified, which provided theoretical and empirical data support for the team’s next experimental work. A large number of research results show that nanomaterials improve the mechanical properties and microstructure of the ITZ, thus enhancing the mechanical properties and durability of concrete. The results of this article will provide source materials for the development of this field, a broader research basis for peer research, and a basis for further development of green engineering materials.

中文翻译：

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混凝土界面过渡区的微观结构特征及纳米改性：综述

摘要 界面过渡区(ITZ)长期以来一直被认为是混凝土的薄弱区。许多学者针对ITZ的性能提升进行了较为分散的尝试性探索。应用纳米材料增强混凝土中的 ITZ 是一项很有前景的研究。为了进一步研究该领域的基本原理和实际应用，迫切需要对已有成果进行系统梳理。本研究对混凝土中ITZ的纳米改性进行了系统的回顾和总结。首先，本研究回顾了 ITZ 的微观特征，包括水化产物、孔隙率和显微硬度。然后从以上三个方面回顾了纳米材料对ITZ的影响。最后，初步阐明了纳米材料修饰ITZ的方法和机理，为团队下一步的实验工作提供了理论和经验数据支持。大量研究结果表明，纳米材料改善了ITZ的力学性能和微观结构，从而提高了混凝土的力学性能和耐久性。本文的研究成果将为该领域的发展提供源头材料，为同行研究提供更广阔的研究基础，为进一步开发绿色工程材料奠定基础。从而提高混凝土的力学性能和耐久性。本文的研究成果将为该领域的发展提供源头材料，为同行研究提供更广阔的研究基础，为进一步开发绿色工程材料奠定基础。从而提高混凝土的力学性能和耐久性。本文的研究成果将为该领域的发展提供源头材料，为同行研究提供更广阔的研究基础，为进一步开发绿色工程材料奠定基础。