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. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
