【摘要】 本工作提出了一种碳化养护钢渣粉3D打印材料的制备方法。以钢渣粉为主要胶凝材料，利用少量普通硅酸盐水泥的高水化活性保证材料打印成型后的初始强度，增强打印材料的可建造性；材料体系中硅灰颗粒的“滚珠效应”改善了打印材料的可挤出性；使用聚乙烯醇(PVA)、羧甲基纤维素钠(CMC)作为流变调节组分进一步调控打印材料的流变性能，满足材料打印性能需求。研究了拌合水固比与流变调节组分掺量对钢渣粉3D打印材料流变性能、打印性能与力学强度的影响规律，探究了碳化养护过程中钢渣粉3D打印材料成分变化与微观结构演变。结果表明，当浆料拌合水固比为0.16,PVA与CMC掺量分别为0.2%(质量分数，下同)、0.1%时，钢渣粉3D打印材料具有最佳的打印性能与力学强度，打印样品经12 h碳化养护后抗压强度为64 MPa;碳化养护过程中，大量镁方解石碳化反应产物填充基体孔隙，迅速提高打印材料基体的致密程度，是打印材料力学性能快速发展的主要机理。更多还原

【Abstract】 A CO₂ curable steel slag powder 3D printing material was designed based on the high carbonation activity of steel slag powder. In steel slag 3D printing material, steel slag was used as the main binder, a small amount of hydraulic ordinary Portland cement was used to ensure the initial strength of printing structure and enhance the buildability of the steel slag printing slurries. The appropriate amount of SF was applied to improve the extrudability of steel slag printing slurries, due to the ball-rolling effect of SF particles. And in order to meet the printing performance requirements of steel slag 3D printing materials, PVA and CMC were used to further regulate the rheological properties. Effect of water to solid ratio and proportion of rheology modifying agent on rheological property, printability and mechanical property of steel slag 3D printing materials was investigated. Composition and microstructure changes of steel slag 3D printing materials during carbonation curing were illustrated. The result showed that the steel slag 3D printing material displayed the best printability and mechanical strength when the mixing W/S was 0.16, while the proportions of PVA and CMC were 0.2wt% and 0.1wt%, respectively. The compressive strength of printing samples reached 64.0 MPa after 12 h carbonation curing. During the carbonation curing, a large amount magnesium calcite, what was the main carbonation product, filled the matrix pores and rapidly densified the printing samples, which was main mechanism for the development of steel slag 3D printing materials’ mechanical properties.更多还原