电-热超高性能混凝土:设计、制备与应用

Electro-Thermal Ultra-High Performance Concrete: Design,Preparation,and Application

发展高性能与多功能混凝土已成为混凝土可持续发展的一个重要方向。其中, 具有电-热功能的混凝土在混凝土基础设施施工中的低温养护与热养护、交通基础设施的融雪化冰和室内与养殖场电热取暖以及电-热能存储建筑取暖等诸多领域具有广泛的应用前景。超高性能混凝土 (Ultra- high performance concrete, UHPC) 具备发展高导电性、导热性以及优异电-热性能的高性能与多功能混凝土的原材料组成“基因”, 但应用常规钢纤维制备的UHPC电导低而无法实现电-热功能。在此背景下, 本文系统综述了电-热UHPC的研究进展, 首先介绍了电-热UHPC设计/制备的方法及原理; 其次, 探讨了电-热UHPC在自养护、自加热及储能应用的相关方法及原理; 最后, 总结讨论了电-热UHPC的未来研究方向。该综述有助于丰富高性能与多功能/智能混凝土及相关理论, 并提高基础设施建造和使用/运营效率及安全性和舒适性, 同时实现节能降碳。

Developing high-performance and multifunctional/smart concrete has become an important direction for sustainable concrete development. Among these, concrete with electro-thermal functionality has broad application prospects in various fields, such as low-temperature curing and thermal curing in concrete infrastructure construction, snow and ice melting in transportation infrastructure, indoor and livestock-facility electric heating, and electro-thermal energy storage for building heating. Ultra-high-performance concrete ( UHPC) inherently possesses the raw-material “genes” needed for developing concrete with high electrical conductivity, high thermal conductivity, and excellent electro-thermal properties; however, UHPC incorporating conventional steel fibers exhibits low electrical conductivity and therefore cannot realize electro- thermal functionality. Against this background, this paper systematically reviews the research progress on electro-thermal UHPC. First, the design and preparation methods and underlying principles of electrothermal UHPC are introduced. Then, the mechanisms and application strategies of electro-thermal UHPC in self-curing, self-heating, and energy-storage systems are discussed. Finally, future research directions for electro-thermal UHPC are summarized. This review advances the understanding of high-performance and multifunctional/ smart concrete and related theories, and helps improve the efficiency, safety, and comfort of infrastructure construction and operation while contributing to energy conservation and carbon reduction.