Use of Nanoclays and Methylcellulose to Tailor Rheology for Three-Dimensional Concrete Printing
Use of Nanoclays and Methylcellulose to Tailor Rheology for Three-Dimensional Concrete Printing
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DOI：
10.14359/51733129
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发表时间：
2021-11-01
影响因子：
1.7
通讯作者：
Kawashima, Shiho
中科院分区：
文献类型：
--
作者：
Douba, AlaEddin;Kawashima, Shiho
如果混凝土系统能够提供最小的处理阻力，同时保持高负载阻力和结构稳定性，则该系统被认为是高度可打印的。三维（3D）混凝土打印的主要复杂性之一在于其对材料和设备的敏感性，这些材料和设备会随层间时间、水化时间和剪切历史的变化而变化。纳米粘土是增强结构形成的有效添加剂，甲基纤维素作为次级添加剂被引入，可以显著增强纳米粘土对静态屈服应力的影响，同时延长层间打开时间，提高长丝的粘结性。通过静态屈服应力、稳态粘度、存储模量等流变特性以及等温量热法测定水化热，研究了两种体系在不同含量下的相容性。与参考膏体相比，混合体系在总质量含量仅为3.0%时，静态屈服应力增加了900%。
A concrete system is identified as highly printable if it can offer minimal resistance to handling while sustaining high load resistance and structural stability. One of the major complexities of three-dimensional (3D) concrete printing lies in its sensitivity to materials and equipment that varies the time among layers, hydration time, and shear history. While nanoclays are effective additives for enhancing structural buildup, methylcellulose is introduced as a secondary additive to significantly amplify the nanoclays' effect on the static yield stress while prolonging the open time between layers and increasing filament cohesiveness. The compatibility of these two systems at different contents is studied by characterizing rheological properties such as static yield stress, steady-state viscosity, and storage modulus, as well as the heat of hydration through isothermal calorimetry. The hybrid system is found to increase the static yield stress by up to 900% compared to the reference paste at only 3.0 wt.% total content by mass.