Rheology and buildability of sustainable cement-based composites containing micro-crystalline cellulose for 3D-printing
Rheology and buildability of sustainable cement-based composites containing micro-crystalline cellulose for 3D-printing
复制标题
用于 3D 打印的含有微晶纤维素的可持续水泥基复合材料的流变学和可施工性
DOI：
10.1016/j.jclepro.2019.118054
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发表时间：
2019-12-01
影响因子：
11.1
通讯作者：
Xing, Feng
中科院分区：
文献类型：
--
作者：
Long, Wu-Jian;Tao, Jie-Lin;Xing, Feng
与传统制造业相比，3D打印对环境的影响更小，对能源的需求也更低，因此3D打印在建筑业中越来越受欢迎。这项技术的快速应用在很大程度上依赖于与3D打印机兼容的高性能水泥基复合材料的开发。本研究旨在开发高品质、可持续发展的微晶纤维素水泥基复合材料，以满足3D打印的要求。系统地考察了3D打印用水泥基复合材料的工作性、流变性、可构造性和力学性能。流变性分析表明，掺入1wt%MCC的砂浆的塑性粘度和屈服应力分别比不掺MCC的砂浆提高20.9%和190.0%。掺入1wt%MCC的砂浆的成型性也得到了改善，印刷结构在印刷过程中丝束之间没有大的裂纹，也没有出现扭曲的成分。与不掺MCC的砂浆相比，掺入1wt%MCC的砂浆28d抗压和抗折强度分别提高了18.6%和12.5%。此外，通过考虑添加剂制造的材料属性并使用软件工具进行支持建筑信息建模(BIM)的生命周期评估(LCA)建模，对印刷住宅整个生命周期的碳排放进行了量化。结果表明，在相同的力学强度下，与不掺MCC的砂浆相比，掺入1wt%MCC的砂浆可减少6.82%的二氧化碳排放量。流变性和可成型性的全面改善以及环境效益的提高，可以促进MCC增强水泥基材料在3D打印行业中的可持续工业利用。(C)2019爱思唯尔有限公司。保留所有权利。
3D printing is becoming increasingly popular for construction owing to its reduced environmental impact and lower energy demand than conventional manufacturing. Rapid application of this technology relies largely on the development of high-performance cement-based composites compatible with 3D printers. This study aims to develop high-quality and sustainable cement-based composites containing microcrystalline cellulose (MCC) that can satisfy the requirements for 3D printing. The workability, rheological behavior, buildability, and mechanical properties of the cement-based composites for 3D printing were examined systematically. The rheological analysis revealed that the plastic viscosity and yield stress of mortars with 1 wt% MCC were increased by 20.9% and 190.0%, respectively, compared with those of mortars without MCC. The buildability of mortars with 1 wt% MCC was also improved, and the printed structure exhibited neither large cracks among the printed filaments nor distorted components in the printing process. Compared with the mortars without MCC, the 28-d compressive and flexural strengths of the mortars with 1 wt% MCC were increased by 18.6% and 12.5%, respectively. In addition, the carbon emissions from the overall life cycle of a printed residence were quantified by considering the material attributes of additive manufacturing and using software tools to conduct building information modeling (BIM)-enabled life cycle assessment (LCA) modeling. The results indicated that compared with the mortars without MCC at equivalent mechanical strengths, the mortars containing 1 wt% MCC could reduce the CO2 emissions by 6.82%. The comprehensive improvement in rheological properties and buildability as well as the environmental benefits can promote the sustainable industrial utilization of MCC-reinforced cement-based materials in the 3D-printing industry. (C) 2019 Elsevier Ltd. All rights reserved.