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首页> 美国卫生研究院文献>Materials >Effects of Curing Conditions on the MECHANICAL and Microstructural Properties of Ultra-High-Performance Concrete (UHPC) Incorporating Iron Tailing Powder
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Effects of Curing Conditions on the MECHANICAL and Microstructural Properties of Ultra-High-Performance Concrete (UHPC) Incorporating Iron Tailing Powder

机译：固化条件对超高性能混凝土（UHPC）机械和微观结构性能的影响铁拖粉

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摘要

It has been reported that iron tailing powder (ITP) has the potential to partially replace cement to prepare ultra-high-performance concrete (UHPC). However, the reactivity of ITP particles in concrete largely depends on the curing method. This study investigates the effects of curing conditions on the mechanical and microstructural properties of UHPC containing ITP. To achieve this objective, three research tasks are conducted, including (1) preparing seven concrete formulations by introducing ITP; (2) characterizing their mechanical performance under different curing regimes; and (3) analyzing their microstructure by XRD patterns, FTIR analysis, and SEM observation. The experimental results show that there is an optimum ITP dosage (15%) for their application. The concrete with 15% ITP under standard curing obtains 94.3 MPa at 7 days, their early-age strength could be even further increased by ~30% (warm-water curing) and ~35% (steamed curing). The steam curing regime stimulates the activity of ITP and refines the microstructure. This study demonstrates the potential of replacing Portland cement with ITP in UHPC production.
机译：据报道，铁拖尾粉末（ITP）具有部分替代水泥以制备超高性能混凝土（UHPC）。然而，混凝土中的ITP颗粒的反应性很大程度上取决于固化方法。本研究研究了固化条件对含有ITP的UHPC机械和微观结构性能的影响。为实现这一目标，进行了三项研究任务，包括（1）通过介绍ITP制定七种具体配方; （2）在不同的固化制度下表征其机械性能; （3）通过XRD模式，FTIR分析和SEM观察分析它们的微观结构。实验结果表明，它们的应用有最佳的ITP剂量（15％）。在标准固化下的15％ITP的混凝土在7天内获得94.3MPa，其早期强度甚至可以进一步提高〜30％（温水固化）和〜35％（蒸熟固化）。蒸汽固化性能刺激ITP的活性并改善微观结构。本研究表明，在UHPC生产中用ITP取代波特兰水泥的潜力。

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