Micro-cable reinforced geopolymer composite for extrusion-based 3D printing
Micro-cable reinforced geopolymer composite for extrusion-based 3D printing
复制标题
用于基于挤出的 3D 打印的微缆增强地质聚合物复合材料
DOI：
10.1016/j.matlet.2018.09.159
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发表时间：
2019-01-15
影响因子：
3
通讯作者：
Bai, Gang
中科院分区：
文献类型：
--
作者：
Ma, Guowei;Li, Zhijian;Bai, Gang
在土木工程实践中，大地聚合物已被应用于适应3D打印的快速发展，并通过消除波特兰水泥的使用，使这项技术达到了最大的生态友好潜力。然而，3D打印混凝土的固有问题在于抗拉强度低，且由于无筋而延性差，这极大地限制了3D打印材料和结构的应用。因此，本研究在实验上探索了在纤维(12 Mm)沉积过程中直接缠绕连续微细钢缆(1.2 mm)，形成一种增强的地聚合物复合材料的可行性。设计了三种不同的打印路径配置，验证了微缆增强土聚合物复合材料在挤出3D打印中的适用性。通过四点弯曲试验对该复合材料的弯曲性能进行了测试和评价。结果表明，微缆与地聚合物具有良好的粘结性和协调性。土聚合物复合材料的机械强度、韧性和开裂后变形均有显著提高。(C)2018爱思唯尔B.V.保留所有权利。
Geopolymer has been applied to accommodate the rapid development of 3D printing in civil engineering practices and contributed this technique to reach its maximum eco-friendly potentials by eliminating the use of Portland cement. However, inherent problems with 3D printing concrete lie in the low tensile strength and poor ductility due to non-reinforcement, which greatly limit the application of 3D printing materials and structures. Hence, this study experimentally explores the feasibility of directly entraining a continuous micro steel cable (1.2 mm) during filaments (12 mm) deposition process, forming a reinforced geopolymer composite material. Three different printing path configurations are deigned to verify the applicability of micro-cable reinforced geopolymer composite for extrusion-based 3D printing. Flexural bending capacities of the proposed composite is measured and evaluated through four-point bending test. The results prove the well bonding and coordination of the micro-cable and geopolymer. Significant improvement of mechanical strength, toughness and post-cracking deformation of geopolymer composite are demonstrated. (C) 2018 Elsevier B.V. All rights reserved.