中/高度真空环境下水泥基材料性能的研究进展

Research Progress on Properties of Cement-Based Materials under Medium or High Vacuum Environment

构建低真空运行环境以减小空气阻力和噪声的真空管道磁悬浮高速列车系统,是高速轨道交通技术发展的重要方向。混凝土作为水泥基材料的重要代表,是真空磁悬浮管线方案中的重要备选结构材料,需应对真空服役环境的新挑战。本文总结了中/高度真空环境对硬化水泥浆体水化产物特征峰的影响,中/高度真空环境对水泥基材料水分传输、收缩变形和孔结构的影响,以及中/高度真空环境下水泥基材料力学性能变化规律。最后对水泥基材料在真空环境下的应用方向进行了讨论与展望,以期为开发适用于真空环境的高性能水泥基材料提供借鉴与参考。

Constructing a vacuum pipeline maglev high-speed train system with low vacuum operating environment to reduce air resistance and noise is an important direction for the development of higher speed rail transit technology in the future.Concrete,as an important representative of cement-based materials,is an important alternative structural material in vacuum magnetic levitation pipeline scheme and needs to address new challenges in vacuum service environment.This paper summarizes the influence of medium/high vacuum environment on characteristic peak of hydration products of hardened cement paste,the influence of medium/high vacuum environment on water transmission,shrinkage deformation and pore structure of cement-based materials,and the change law of mechanical properties of cement-based strength of materials in medium/high vacuum environment.Finally,the application direction of cement-based materials in vacuum environment is discussed and prospected in order to provide reference for the development of high-performance cementbased materials suitable for vacuum environment.