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Dipotassium hydrogen phosphate activated Al-rich steel slag: The role of layered double hydroxides and aluminum hydrate gel
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-10 , DOI: 10.1016/j.cemconres.2025.107783
Mengyu Zhu, Qingliang Yu, S.R. van der Laan, Yuxuan Chen

Due to absence of C-S-H gel, chemically activated mixed Al-rich steel slag often shows low early-age strength. This work proposes a novel method to accelerate the hydration of Al-rich steel slag by dipotassium hydrogen phosphate (DHP) activation. Results reveal that DHP significantly promotes the formation of layered double hydroxides (LDHs) by increasing pH of the pore solution and supplying phosphate ions as the interlayer anion. Ca-Al-LDHs competes with the Ca2+ used to form metastable C2AH8, thereby releasing additional AlOH4, which is further accompanied by the increased formation of AH3 gel. Consequently, DHP-activated steel slag develops a denser microstructure dominated by highly-crystalized LDHs and amorphous AH3 gel and achieving impressive compressive strength (40 MPa at 28 days). Overall, this study provides a unique activation method for enhancing the early hydraulic activity of steel slag by in-situ formation of LDHs and AH3 gel, contributing to the unique way to utilize steel-making byproducts.

中文翻译:


磷酸氢二钾活化富铝钢渣:层状双氢氧化物和水合铝凝胶的作用



由于缺乏 C-S-H 凝胶,化学活化的混合富铝钢渣通常表现出较低的早期强度。本研究提出了一种通过磷酸氢二钾 (DHP) 活化加速富铝钢渣水化的新方法。结果表明,DHP 通过提高孔隙溶液的 pH 值并提供磷酸根离子作为层间阴离子,显著促进层状双氢氧化物 (LDH) 的形成。Ca-Al-LDHs 与用于形成亚稳 C2AH8 的 Ca2+ 竞争,从而释放出额外的 AlOH4−,这进一步伴随着 AH3 凝胶的形成增加。因此,DHP 活化钢渣形成了更致密的微观结构,以高度结晶的 LDH 和非结晶的 AH3 凝胶为主,并实现了令人印象深刻的抗压强度(28 天时为 40 MPa)。总体而言,本研究提供了一种独特的活化方法,通过原位形成 LDH 和 AH3 凝胶来增强钢渣的早期水力活动,有助于利用炼钢副产品的独特方式。
更新日期:2025-01-10
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