彻底改变混凝土:用电弧炉 (EAF) 替换渣提高性能和获得基本见解
Jing Cheng Jason Ting1, Foo Wei Lee1, Kim Ho Yeap1
1Department of Civil Engineering, University Tunku Abdul Rahman, Sungai Long Campus, Jalan Sungai Long, Bandar Sungai Long, Kajang 43000, Selangor, Malaysia.
Materials (Basel, Switzerland)
|April 24, 2025
概括
中型电弧炉 (EAF) 渣渣颗粒 (R2) 提高了混凝土的压力强度和碳化. 在45%的替代率下,最佳使用会产生可持续的,高性能混凝土,具有优越的强度和二氧化碳吸收能力.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 环境科学 环境科学
背景情况:
- 电弧炉 (EAF) 渣是一种钢铁制造的副产品.
- 可持续的建筑实践需要创新的材料利用.
- 优化EAF渣在混凝土中的融入对于性能和环境效益至关重要.
研究的目的:
- 调查EAF渣渣颗粒大小和替代水平对混凝土工程性能的影响.
- 确定EAF渣的最佳特性,以提高混凝土性能和碳捕获.
- 阐明EAF渣对混凝土的影响背后的微观结构机制.
主要方法:
- 在三个粒子大小范围 (R1,R2,R3) 中分析EAF渣.
- 评估混凝土的压力强度和碳化潜力在不同的替换百分比.
- 使用扫描电子显微镜 (SEM) 和能量分散式X射线光谱 (EDX) 的微结构分析.
主要成果:
- 中型EAF渣渣颗粒 (R2) 显示出一致的压力强度和优异的碳化效率.
- 富含和氧化物的R2颗粒促进了碳酸的形成和二氧化碳的吸收.
- 通过将R2EAF渣渣取代45%的细聚合物,从而提高强度稳定性和碳化,实现了最佳性能.
结论:
- 在EAF,渣渣颗粒的大小极大地影响了混凝土的机械性能和碳化行为.
- 中型EAF渣 (R2) 是可持续混凝土,平衡强度和二氧化碳封存的最佳选择.
- 该研究提供了EAF渣成分,微观结构和增强混凝土性能之间的可量化的联系.
更多相关视频
相关概念视频
Additives and Fillers in Concrete
63
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
The...
63
Corrosion of Reinforcement
119
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
119
Pozzolans
86
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
Fly ash is...
86
Types of Cement II
84
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
84
Steel Manufacturing
347
Steel manufacturing is a multi-stage process that begins by smelting iron ore into cast iron in a blast furnace. This initial stage involves layering iron ore with coke, a type of fuel, and crushed limestone within the furnace. The coke is ignited with a high volume of air, leading to the creation of carbon monoxide, which acts to reduce the iron ore to pure iron.
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
347
Reinforcements in Concrete
60
Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
60


