Preparation and Properties of CO2 Driven Magnesium Slag-based 3D Printing Materials
HUANG Shuai1, ZHANG Wenqin2, LIU Zhichao1,3,*, WANG Fazhou3
1 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China 2 Research Center of Silicate Materials Engineering, Wuhan University of Technology, Wuhan 430070, China 3 State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology), Wuhan 430070, China
Abstract: Magnesium slag is an industrial solid waste containing a large amount of dicalcium silicate with poor hydration activity and good carbonation activity. A preparation method of magnesium slag-based 3D printing material is proposed. The method uses magnesium slag with high carbonation activity as the main cementitious component, and silica fume, water and superplasticizer are added to prepare printable paste with adjustable rheology. After printing, 3D printing samples with excellent mechanical strength can be obtained in a short time through pre-drying and CO2 curing. The influence of carbonation curing conditions on the mechanical properties and microstructure of printed samples was investigated. Results show that, a proper pre-drying is beneficial to the carbonation strength. After pre-drying to 0.05 water to solid ratio before carbonation curing, then CO2 curing for 3h at 0.3 MPa, the compressive strength of the printed sample reaches 48.8 MPa; the densification of microstructure and the formation of calcite are the main reasons for the rapid strength gain of printed sample after CO2 curing.
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2023, Vol. 37 
