Early thermal curing regimes are essential for guaranteeing the outstanding performance and increasing the productivity of ultra-high performance concrete (UHPC) by influencing the hydration of binders and microstructure of concrete. Meanwhile, the efficiency of early thermal curing is mainly determined by curing parameters and mix proportion of UHPC. Based on this, this paper provides a comprehensive review on the impact of different types of early thermal curing regimes, involving hot water, hot air, steam, autoclave, microwave, and electric curing, on the mechanical properties, durability, microstructure, and application of UHPC, and then pointing out a bottom-up understanding of each type of thermal curing regime from microstructure to properties. It can be seen that compared with hot air curing and steam curing, autoclave curing possesses more excellent improvement on the early and long-term properties of UHPC due to the combined effect of high temperature and environmental pressure on hydration, but the complex implementation equipment of autoclave curing increases the cost and limits the on-site deployment. Microwave curing shows the best strength growth rate for UHPC due to the high energy input, but there is a risk of microwave leakage. Electric curing possess advantages with simple and convenient layout (for example, steel bars can be used to apply voltage), meanwhile, electric curing has potential to regulate the interface state of steel fibers and steel bars due to the electric conductive function of them. Thus, it is expected to provide revolutionary approach in the material design, field construction, and massive concrete curing, low-temperature construction, and rapid repairing construction of UHPC.

中文翻译：

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早期热养护方式对超高性能混凝土性能的影响：综述


早期热固化制度对于通过影响粘合剂的水合作用和混凝土的微观结构来保证超高性能混凝土（UHPC）的出色性能和提高生产率至关重要。同时，早期热固化的效率主要由固化参数和UHPC的混合比例决定。在此基础上，本文全面综述了不同类型的早期热固化方式，包括热水、热空气、蒸汽、高压釜、微波和电固化对机械性能、耐久性、微观结构和应用的影响。 UHPC，然后指出从微观结构到性能的每种类型的热固化机制的自下而上的理解。可见，与热风养护和蒸汽养护相比，高压釜养护由于高温和环境压力对水化的共同作用，对UHPC的早期和长期性能有更优异的改善，但其实施设备复杂。高压釜固化增加了成本并限制了现场部署。由于能量输入较高，微波固化对 UHPC 显示出最佳的强度增长率，但存在微波泄漏的风险。电固化具有布局简单方便（例如可以用钢筋施加电压）的优点，同时由于钢纤维和钢筋的导电功能，电固化具有调节钢纤维和钢筋界面状态的潜力。有望为UHPC的材料设计、现场施工、大体积混凝土养护、低温施工、快速修复施工提供革命性的方法。