用于可持续基础设施的高性能与多功能纳米氧化钛混凝土

High Performance and Multifunctional Nano Titanium Oxide Concrete for Sustainable Infrastructures

作为世界上使用量最大的人造材料, 混凝土建造了人类赖以生存的主要基础设施。但随着基础设施的规模化、复杂化以及应用领域的不断扩大, 传统混凝土材料性能单一且性能提升趋缓已不能满足某些特殊/恶劣环境对混凝土性能的要求。混凝土性能的充分挖掘或拓展 (比如高性能化、多功能化、结构-功能一体化) 已成为混凝土材料可持续发展的一个重要方向, 同时也是实现基础设施可持续发展的一个重要途径。纳米氧化钛填料优异的力学、电学、光学、磁学以及生物学本征性能可以改善混凝土的宏-细-微观性能, 应用其有望发展高性能 (包括高力学性能和高耐久性能) 以及多功能混凝土。本文系统介绍了纳米氧化钛复合混凝土的制备、微观结构、水化性能、流变性能、工作性能、力学性能、收缩性能、耐久性能、功能特性以及应用, 并讨论了纳米氧化钛复合混凝土后续发展面临的挑战和发展策略。

As the most used man-made material in the world, concrete has built the main infrastructures on which human beings depend. However, with the increasing scale and complexity of infrastructures and the expansion of application areas, traditional concrete materials with single performance and slow performance improvement can no longer meet the requirements of concrete performance in certain special/harsh environments. The full exploitation or expansion of concrete properties (e. g. high performance, multifunctionality, structural-functional integration) has become an important direction for the sustainable development of concrete materials, and an important way to achieve sustainable infrastructure development. The excellent mechanical, electrical, optical, magnetic and biological intrinsic properties of nano titanium oxide particles can improve the macro-meso-microscopic properties of concrete, and its application is expected to develop high performance (including high mechanical properties and high durability) and multifunctional concrete. This paper systematically introduces the preparation, microstructure, hydration properties, rheological properties, workability, mechanical properties, shrinkage properties, durability, functional properties and applications of nano titanium oxide composite concrete, and discusses the challenges and development strategies for the subsequent development of nano titanium oxide composite concrete.