Performance and hydration mechanisms of ultrafine iron ore tailings enhanced supersulfated cement with high phosphogypsum content

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-12-13 DOI:10.1016/j.cemconcomp.2024.105891

Mingzhe Zhang , Bing Chen , Weisheng Zhu

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Abstract

This study systematically investigates the influence of ultrafine iron ore tailings (UIOT) on the performance and hydration process of supersulfated cement (SSC) with high phosphogypsum (PG) content. UIOT incorporation retards early-age strength but enhances later-age strength, with a 20 % replacement ratio of granulated blast furnace slag (GBFS) leading to a 52 % increase in 28-day compressive strength. The performance improvement can be primarily attributed to the following aspects: in the first instance, UIOT regulates the formation rate of ettringite (AFt) by promoting the formation of Fe-Al-bearing AFt ((Fe, Al)-AFt), thereby reducing the excessive formation of AFt typically observed in high-gypsum blended systems. Furthermore, UIOT promotes the formation of calcium-alumino-silicate hydrate (C-(A)-S-H) gel and optimizes the Si/Ca ratio of the gel. The unreacted UIOT particles also play a physical filling role, contributing to the performance enhancement.

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超细铁矿尾矿增强高磷石膏超硫酸盐水泥性能及水化机理

本研究系统研究了超细铁尾矿（UIOT）对高磷石膏（PG）含量过硫酸盐水泥（SSC）性能及水化过程的影响。掺入UIOT会降低早期强度，但会提高后期强度，颗粒化高炉渣（GBFS）替代率为20%，28天抗压强度提高52%。性能的提高主要归因于以下几个方面：首先，UIOT通过促进含Fe-Al的AFt （(Fe, Al)-AFt）的形成来调节钙矾石（AFt）的形成速度，从而减少了高石膏混合体系中常见的AFt的过量形成。此外，UIOT促进了钙铝硅酸盐水合物（C-(A)- s - h）凝胶的形成，并优化了凝胶的Si/Ca比。未反应的UIOT颗粒也起到物理填充作用，有助于提高性能。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.