School of Resources & Civil Engineering, Northeastern University, Shenyang, 110819, China.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 10083, China.
Environ Sci Pollut Res Int. 2024 Sep;31(44):56194-56209. doi: 10.1007/s11356-024-34746-0. Epub 2024 Sep 11.
Using steel slag (SS) as cementitious material and fine aggregate in concrete is an effective and environmental method for SS consumption and cost reduction. In this paper, SS was recycled in large volumes in concrete as partial cementitious material and fine aggregate. The compressive strength and reaction mechanism of cementitious material with different SS powder contents including 20%, 25%, 30%, and 35% were presented. The results indicated that 20% of SS powder improved the compressive strength by 34.57% and the hydration products were ettringite (AFt) and calcium silica hydrate(C-(A)-S-H). Furthermore, the mechanical and durability performance of concrete with SS as fine aggregate were investigated. When the SS substitution rate was 75%, the compressive strength was increased by 37.83%. The volume shrinkage rate and 28d-carbonation depth were reduced nearly by 64% for 90 days and 2.33 mm, respectively. The chloride ion penetration resistance reached the optimal grade Q-V and abrasion resistance was improved by nearly 24%. Along with the reduced CO by 210-294 kg/m and the decreased cost by 12.61 USD/m, it is regarded as an effective method to consume steel slag. As such, this research provided a scientific and systematic basis for the large-scale disposal and utilization of industrial waste residues as well as recycled materials preparation.
将钢渣（SS）用作胶凝材料和细骨料来生产混凝土是消耗 SS 和降低成本的有效且环保的方法。本文大量回收 SS 作为部分胶凝材料和细骨料来生产混凝土。展示了 SS 粉含量分别为 20%、25%、30%和 35%时，胶凝材料的抗压强度和反应机理。结果表明，20%的 SS 粉提高了抗压强度 34.57%，水化产物为钙矾石（AFt）和硅酸钙水化物（C-(A)-S-H）。此外，还研究了 SS 作为细骨料的混凝土的力学和耐久性性能。当 SS 替代率为 75%时，抗压强度提高了 37.83%。28d 碳化深度减少了近 64%，为 2.33mm，90d 体积收缩率减少了近 64%。氯离子渗透阻力达到最佳等级 Q-V，耐磨性提高了近 24%。同时 CO 排放量减少了 210-294kg/m，成本降低了 12.61 美元/m，这被认为是消耗钢渣的有效方法。因此，这项研究为工业废料的大规模处理和利用以及再生材料的制备提供了科学和系统的基础。
