早期CO2养护对钢渣固废胶凝材料性能的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0304

摘要/Abstract

摘要： 为促进钢渣的低碳和资源化利用,采用钢渣协同高炉矿渣、脱硫石膏和少量水泥制备钢渣固废胶凝材料,通过抗压强度、产物组成、微观结构、体积稳定性和安定性分析,研究了早期CO₂养护对钢渣固废胶凝材料性能的影响。结果表明,相比于未碳化养护,早期CO₂养护下钢渣固废胶凝材料抗压强度和线性膨胀率均降低。早期CO₂养护下,较低钢渣含量(40%~45%,质量分数)且较高高炉矿渣含量(32%~35%,质量分数)时,钢渣固废胶凝材料3 d抗压强度较高,可达14 MPa,高钢渣含量(55%~60%,质量分数)时,钢渣固废胶凝材料后期抗压强度较高,可达52.7 MPa。早期CO₂养护下钢渣固废胶凝材料发生碳化反应,形成CaCO₃晶体,填充孔隙并密实微观结构,部分CaCO₃在后期参与水化反应生成单碳型水化碳铝酸钙。高钢渣含量(>55%,质量分数)和低石膏含量(<15%,质量分数)下钢渣固废胶凝材料具有较低的线性膨胀率和压蒸膨胀率,体积稳定性提升。

关键词: 钢渣, 固废胶凝材料, 抗压强度, 安定性, 早期CO₂养护

Abstract: In order to promote the low-carbon and resource utilization of steel slag, steel slag combined with ground blast furnace slag, desulfurized gypsum and a small amount of cement were used to prepare steel slag solid waste cementitious materials. The effect of early CO₂ curing on the properties of steel slag solid waste cementitious materials was studied by compressive strength, product composition, microstructure, volume stability and soundness analysis. The results show that the compressive strength and linear expansion rate of steel slag solid waste cementitious materials under early CO₂curing are lower than those non-carbonation curing. Under early CO₂ curing, when the steel slag content (40%~45%, mass fraction) is low and the ground blast furnace slag content (32%~35%, mass fraction) is high, the early compressive strength of steel slag solid waste cementitious material is high, up to 14 MPa. When the steel slag content (55%~60%, mass fraction) is high, the late compressive strength of steel slag solid waste cementitious materials is high. Under early CO₂ curing, the steel slag solid waste cementitious materials undergo carbonization reaction to form CaCO₃ crystals, which fill the pores and compact the microstructure. Some CaCO₃ participates in the hydration reaction in the later stage to form single carbon hydrated calcium carboaluminate. The steel slag solid waste cementitious materials with high steel slag content (>55%, mass fraction) and low desulfurized gypsum content (<15%, mass fraction) have lower linear expansion rate and autoclave expansion rate, and improve volume stability.

Key words: steel slag, solid waste cementitious material, compressive strength, soundness, early CO₂ curing

中图分类号:

TU526

叶纪盛, 马英, 李淯伟, 邰安, 王家豪. 早期CO₂养护对钢渣固废胶凝材料性能的影响[J]. 硅酸盐通报, 2025, 44(9): 3326-3336.

YE Jisheng, MA Ying, LI Yuwei, TAI An, WANG Jiahao. Effect of Early CO₂ Curing on Properties of Steel Slag Solid Waste Cementitious Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3326-3336.

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早期CO₂养护对钢渣固废胶凝材料性能的影响

Effect of Early CO₂ Curing on Properties of Steel Slag Solid Waste Cementitious Material

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