Enhancing carbonation and strength of MgO cement through 3D printing
Enhancing carbonation and strength of MgO cement through 3D printing
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DOI：
10.1016/j.conbuildmat.2022.126867
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发表时间：
2022-04
影响因子：
7.4
通讯作者：
A. Douba;P. Badjatya;S. Kawashima
中科院分区：
文献类型：
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作者：
A. Douba;P. Badjatya;S. Kawashima
氧化镁（MgO）通过碳化作用增强物理强度，是碳密集型波特兰水泥的潜在替代品。在本文中，我们研究了3D打印是否可以提高碳化和抗压强度。使用纳米粘土和甲基纤维素的混合物对氧化镁糊状物的流变性进行了改性，以制备出具有暴露的开放式和封闭式（固体）填充的圆柱体。结果表明，与常规铸造试样相比，3天和28天的强度显著增加。这是由于较高的暴露表面积和较高的早期水分蒸发导致的孔隙度增加，两者都导致了较高的二氧化碳摄入量。
Magnesium oxide (MgO), which develops physical strength through carbonation, is a potential alternative to carbon intensive Portland cement. In this paper, we examined whether 3D printing could improve carbonation and compressive strength. The rheology of MgO paste was modified using mixtures of nanoclays and methylcellulose to produce cylinders with exposed open-to-air and closed (solid) infills. The results showed significant increases in strength at 3 and 28 days compared to conventionally cast specimens. This was attributed to higher exposed surface area and increase in porosity caused by high early water evaporation, both of which led to higher CO2intake.