Hydration activity and expansibility of different RO phase composition in steel slag

IF 1.4 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Cement Research Pub Date : 2023-01-09 DOI:10.1680/jadcr.21.00227

X. Zhao, Jiwei Hou, Zhimin Chen, Jiaxiang Liu

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引用次数: 0

Abstract

Steel slag (SS) accounts for 15%∼20% of steelmaking output, its application in cement concrete was limited since the poor stability. In this study, the divalent metal oxide solid solution (RO phase) in SS was analog synthesized to study its hydration activity and expansibility. The results showed that the hydration activity and expansibility of MgO in analog-RO phase is affected by the content of FeO, with the increase of molar ratio (x) of FeO to MgO in analog-RO phase the autoclave expansion rate and hydration activity of the cement paste decreased. When x≤0.5, the RO phase had high hydration activity and could cause the poor soundness of SS. When x=1, the RO phase had low hydration activity and could cause the slight expansion of SS. When x≥2, the RO phase had no hydration activity and could not cause the expansion of SS. The control of different analog-RO phase composition induced different hydration and expansibility, which provided a theoretical basis for the influence of RO phase on the soundness of steel slag and putting forward measures to reduce the expansion of SS, promoting the high-volume utilization of SS in cement and concrete.

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钢渣中不同反渗透相组成的水化活性和膨胀率

钢渣（SS）占炼钢产量的15%～20%，由于其稳定性差，在水泥混凝土中的应用受到限制。在本研究中，模拟合成了SS中的二价金属氧化物固溶体（RO相），以研究其水化活性和膨胀性。结果表明，MgO在模拟反渗透相中的水化活性和膨胀性受FeO含量的影响，随着模拟反渗透相FeO/MgO摩尔比的增加，水泥浆的高压釜膨胀率和水化活性降低。当x≤0.5时，RO相具有较高的水化活性，可能导致SS的坚固性较差。当x=1时，RO相的水化活性较低，可引起SS的轻微膨胀。当x≥2时，RO相没有水化活性，不会引起SS的膨胀。控制不同的模拟反渗透相组成会引起不同的水化和膨胀性，这为反渗透相对钢渣安定性的影响提供了理论依据，并提出了减少SS膨胀的措施，促进了SS在水泥和混凝土中的大量利用。

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来源期刊

Advances in Cement Research 工程技术-材料科学：综合

CiteScore

3.70

自引率

5.00%

发文量

审稿时长

3.2 months

期刊介绍： Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.