Dipotassium hydrogen phosphate activated Al-rich steel slag: The role of layered double hydroxides and aluminum hydrate gel

IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement and Concrete Research Pub Date : 2025-01-10 DOI:10.1016/j.cemconres.2025.107783
Mengyu Zhu , Qingliang Yu , S.R. van der Laan , Yuxuan Chen
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Abstract

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.
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磷酸氢二钾活化富铝钢渣:层状双氢氧化物与水合铝凝胶的作用
由于缺乏C-S-H凝胶,化学活化的混合富铝钢渣往往表现出较低的早期强度。提出了一种利用磷酸氢二钾(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值和提供磷酸盐离子作为层间阴离子,显著促进层状双氢氧化物(LDHs)的形成。Ca-Al-LDHs与用于形成亚稳态C2AH8的Ca2+Ca2+竞争,从而释放额外的AlOH4−AlOH4−,这进一步伴随着AH3凝胶形成的增加。因此,dhp活化的钢渣形成了由高结晶LDHs和无定形AH3凝胶主导的致密微观结构,并获得了令人印象深刻的抗压强度(28天40 MPa)。综上所述,本研究提供了一种独特的激活方法,通过原位生成LDHs和AH3凝胶来提高钢渣的早期水力活性,为炼钢副产物的利用提供了独特的途径。
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来源期刊
Cement and Concrete Research
Cement and Concrete Research 工程技术-材料科学:综合
CiteScore
20.90
自引率
12.30%
发文量
318
审稿时长
53 days
期刊介绍: Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.
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