Properties and printability evaluation of three-dimensional printing magnesium oxychloride cement by fully utilizing aeolian sand

IF 2.9 3区工程技术 Q2 ENGINEERING, CIVIL Frontiers of Structural and Civil Engineering Pub Date : 2024-01-12 DOI:10.1007/s11709-023-0994-6

Qinghua Wang, Jinggang Xu, Duo Feng, Wei Li, Yuanyuan Zhou, Qiao Wang

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Abstract

Three-dimensional concrete printing (3DCP) is increasingly being applied in harsh environments and isolated regions. However, the effective utilization of aeolian sand (AS) resources and by-products derived from arid zones for 3DCP is yet to be fully realized. This study developed a three-dimensional (3D) printing composite using AS and magnesium oxychloride cement (MOC) from local materials. The effects of the mole ratio of MgO/MgCl₂ and sand/binder (S/B) ratio on the mechanical properties such as water resistance, drying shrinkage strain, rheology, and printability, were investigated systematically. The results indicated that the optimal mole ratio of MgO/MgCl₂ was 8, which yielded the desired mechanical performance and water resistance. Furthermore, the S/B ratio can be increased to three within the desired printability to increase the AS utilization rate. The rheological recovery and buildability of the 3D-printed MOC with AS were verified. These findings provide a promising strategy for construction in remote deserts.

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充分利用风化砂的三维印刷氧氯化镁水泥的性能和印刷适性评估

三维混凝土打印（3DCP）越来越多地应用于恶劣环境和偏远地区。然而，如何有效利用来自干旱地区的风化砂（AS）资源和副产品进行三维混凝土打印（3DCP），仍有待充分实现。本研究利用当地材料中的AS和氧氯化镁水泥（MOC）开发了一种三维（3D）打印复合材料。系统研究了氧化镁/氯化镁的摩尔比以及砂/粘合剂（S/B）比对力学性能（如耐水性、干燥收缩应变、流变性和可印刷性）的影响。结果表明，MgO/MgCl2 的最佳摩尔比为 8，可获得理想的机械性能和耐水性。此外，在理想的可印刷性范围内，可将 S/B 比增加到 3，以提高 AS 的利用率。使用 AS 的 3D 打印 MOC 的流变恢复和可构建性得到了验证。这些发现为在偏远沙漠地区进行建筑施工提供了一种前景广阔的策略。

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来源期刊

Frontiers of Structural and Civil Engineering Engineering-Architecture

CiteScore

5.20

自引率

3.30%

发文量

734

期刊介绍： Frontiers of Structural and Civil Engineering is an international journal that publishes original research papers, review articles and case studies related to civil and structural engineering. Topics include but are not limited to the latest developments in building and bridge structures, geotechnical engineering, hydraulic engineering, coastal engineering, and transport engineering. Case studies that demonstrate the successful applications of cutting-edge research technologies are welcome. The journal also promotes and publishes interdisciplinary research and applications connecting civil engineering and other disciplines, such as bio-, info-, nano- and social sciences and technology. Manuscripts submitted for publication will be subject to a stringent peer review.