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Feasibility study of using carbonated and ultrasound treated electric arc furnace slag as a nano-enhanced supplementary cementitious material
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.cemconcomp.2025.105946
Jiongqi Chen, Weiyu Li, Wenjie Huang, Qiujin Chen, Yuwei Ma, Mingzhong Zhang, Zongjin Li, Jiyang Fu, Xiaowei Ouyang
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.cemconcomp.2025.105946
Jiongqi Chen, Weiyu Li, Wenjie Huang, Qiujin Chen, Yuwei Ma, Mingzhong Zhang, Zongjin Li, Jiyang Fu, Xiaowei Ouyang
As a primary by-product of the electric arc furnace (EAF) steelmaking process, the relatively low carbonation capacity of EAF slag limits its use as a carbon-sequestering construction material. To address this limitation, this study proposed a two-step chemical-physical modification approach. First, a gas-solid carbonation process was applied, where humidity, temperature, CO₂ concentration, and carbonation duration were adjusted to specifically promote the growth of aragonite whiskers. Next, the carbonated EAF slag underwent liquid-phase ultrasound treatment, and the resulting liquid-solid mixture was used to prepare cement paste. The effect of the two-step modification was evaluated by characterizing the physical properties, microstructural evolution, and phase transformation of the EAF slag. The study further elucidated the feasibility of using modified EAF slag as a supplementary cementitious material (SCM) by examining its nucleation morphology, hydration products, and impact on hydration kinetics. Ultrasound treatment uniformly dispersed the aragonite whiskers, which acted as nanomaterials to fill the pores in the cement paste. Additionally, the exposed silica-rich surface facilitated the nucleation of C-S-H during hydration. The refined pore structure of the hardened paste ultimately resulted in a 30–50 % improvement in compressive strength compared to the untreated group and a 10–20 % increase compared to the pure ordinary Portland cement group. This study offers a novel perspective on utilizing EAF slag as an environmentally beneficial SCM, uncovering its potential properties while addressing the objectives of the CCUS strategy.
中文翻译:
碳酸盐和超声处理的电弧炉渣作为纳米增强补充胶凝材料的可行性研究
作为电弧炉 (EAF) 炼钢工艺的主要副产品,电弧炉渣相对较低的碳化能力限制了其作为碳封存建筑材料的使用。为了解决这一限制,本研究提出了一种两步化学物理修饰方法。首先,应用气固碳化工艺,其中湿度、温度、CO₂ 浓度和碳化持续时间被调整,以专门促进文石晶须的生长。接下来,对碳酸盐化电弧炉渣进行液相超声处理,所得液固混合物用于制备水泥浆。通过表征电弧炉渣的物理性质、微观结构演变和相变来评价两步改性的效果。该研究通过检查改性电弧炉渣的成核形态、水化产物和对水化动力学的影响,进一步阐明了使用改性电弧炉渣作为补充胶凝材料 (SCM) 的可行性。超声处理均匀分散了文石晶须,文石晶须作为纳米材料填充了水泥浆中的孔隙。此外,暴露的富含二氧化硅的表面促进了水合过程中 C-S-H 的成核。与未处理的水泥组相比,硬化浆料的精细孔隙结构最终使抗压强度提高了 30-50%,与纯普通波特兰水泥组相比,抗压强度提高了 10-20%。本研究为利用电弧炉渣作为对环境有益的 SCM 提供了一种新颖的视角,在解决 CCUS 战略目标的同时揭示了其潜在特性。
更新日期:2025-01-30
中文翻译:
碳酸盐和超声处理的电弧炉渣作为纳米增强补充胶凝材料的可行性研究
作为电弧炉 (EAF) 炼钢工艺的主要副产品,电弧炉渣相对较低的碳化能力限制了其作为碳封存建筑材料的使用。为了解决这一限制,本研究提出了一种两步化学物理修饰方法。首先,应用气固碳化工艺,其中湿度、温度、CO₂ 浓度和碳化持续时间被调整,以专门促进文石晶须的生长。接下来,对碳酸盐化电弧炉渣进行液相超声处理,所得液固混合物用于制备水泥浆。通过表征电弧炉渣的物理性质、微观结构演变和相变来评价两步改性的效果。该研究通过检查改性电弧炉渣的成核形态、水化产物和对水化动力学的影响,进一步阐明了使用改性电弧炉渣作为补充胶凝材料 (SCM) 的可行性。超声处理均匀分散了文石晶须,文石晶须作为纳米材料填充了水泥浆中的孔隙。此外,暴露的富含二氧化硅的表面促进了水合过程中 C-S-H 的成核。与未处理的水泥组相比,硬化浆料的精细孔隙结构最终使抗压强度提高了 30-50%,与纯普通波特兰水泥组相比,抗压强度提高了 10-20%。本研究为利用电弧炉渣作为对环境有益的 SCM 提供了一种新颖的视角,在解决 CCUS 战略目标的同时揭示了其潜在特性。