-Mixed hydrogen and biofuels cement clinker: Characterisation, microstructure, and performance

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-10-25 DOI:10.1016/j.cemconcomp.2024.105814

Samuel Adu-Amankwah , Ben Douglas , Leslie Arkless , Nina Cardinal , Maciej Zajac

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引用次数: 0

Abstract

Over 35 % of the CO₂ associated with cement production comes from operational energy. The cement industry needs alternative fuels to meet its net zero emissions target. This study investigated the influence of hydrogen mixed with biofuels, herein designated net zero fuel as an alternative to coal, on the clinker quality and performance of cement produced in an industrial cement plant. Scanning electron microscopy, X-ray diffraction and nuclear magnetic resonance were coupled to study the clinker mineralogy and polymorphs. Hydration and microstructure development in plain and slag blended cements based on the clinker were compared to commercial cement equivalent. The results revealed a lower alite/belite ratio, but a significant proportion of the belite was of the α′_H-C₂S polymorph. These reacted faster and compensated for the alite/belite ratio. Gel and micro-capillary pores were densified, which reduced total porosity and attained comparable strength to the reference plain and blended cement. This study demonstrates that the investigated net zero fuel-produced clinker meets compositional and strength requirements for plain and blended cement, providing a feasible pathway for the cement industry to lower its operational carbon significantly.

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净零燃料（混合氢气和生物燃料）水泥熟料：特性、微观结构和性能。

与水泥生产相关的二氧化碳有 35% 以上来自运营能源。水泥行业需要替代燃料来实现净零排放目标。本研究调查了氢气与生物燃料混合对工业水泥厂生产的水泥熟料质量和性能的影响。通过扫描电子显微镜、X 射线衍射和核磁共振对熟料矿物学和多晶体进行了研究。将以该熟料为基础的普通水泥和矿渣混合水泥的水化和微观结构发展情况与等效的商用水泥进行了比较。结果表明，铝酸盐/白云石比率较低，但白云石中有很大一部分是α'H-C2S多晶体。它们的反应速度更快，弥补了铝矾土/白云石比率的不足。凝胶孔和微毛细管孔被致密化，从而降低了总孔隙率，并获得了与普通水泥和混合水泥相当的强度。这项研究表明，所调查的净零燃料生产熟料符合普通水泥和混合水泥的成分和强度要求，为水泥行业大幅降低运营碳提供了一条可行的途径。

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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.