Kosson Michael, Brown Lesa, Thorne Garrett, Sanchez Florence
Department of Chemical and Biomolecular Engineering, Vanderbilt University, PMB 351604, 2301 Vanderbilt Place, Nashville, TN 37235-1604, USA.
Department of Civil and Environmental Engineering, Vanderbilt University, PMB 351831, 2301 Vanderbilt Place, Nashville, TN 37235-1831, USA.
Materials (Basel). 2024 Nov 23;17(23):5736. doi: 10.3390/ma17235736.
Cement-based 3D printing provides an opportunity to create cement-based elements with a hierarchy of structures and patterns that are not easily achievable using traditional casting techniques, thereby providing new possibilities for improving thermal control and energy storage in cement-based materials. In this study, the influence of internal architecture and ink formulation on the thermal behavior of 3D-printed cement composite beams was investigated using infrared thermal imaging and a conceptual one-dimensional heat transfer model based on cooling fins in convective media. Three-dimensional printed beams with rectilinear, three-dimensional honeycomb, and Archimedean chord infill patterns and cement ink formulations with and without 5% halloysite nanoclay were exposed to a heating source at one end. The thermal behavior of the beams was found to be predominantly influenced by their internal architecture rather than the cement ink formulation, with differences in void structures and heat transfer pathways among the different architectures resulting in a hierarchy of apparent thermal conductivity. The internal architecture resulted in a reduction in apparent thermal conductivity by up to 75%, while the incorporation of halloysite nanoclay in the cement ink led to a reduction of up to 14%. Among the tested internal architecture, the rectilinear architecture showed a 10-15% higher apparent thermal conductivity compared to the three-dimensional honeycomb architecture and a 35-40% higher apparent thermal conductivity than the Archimedean architecture. The research demonstrates a promising strategy for fabricating and evaluating cement-based materials with thermal management capabilities using 3D printing methods.
基于水泥的3D打印为制造具有层次结构和图案的水泥基构件提供了机会，而这些结构和图案使用传统铸造技术难以实现，从而为改善水泥基材料的热控制和能量存储提供了新的可能性。在本研究中，利用红外热成像和基于对流介质中散热片的概念性一维传热模型，研究了内部结构和油墨配方对3D打印水泥复合梁热行为的影响。具有直线、三维蜂窝和阿基米德弦填充图案的三维打印梁以及含有和不含5%埃洛石纳米粘土的水泥油墨配方在一端暴露于热源。结果发现，梁的热行为主要受其内部结构而非水泥油墨配方的影响，不同结构之间的孔隙结构和传热路径差异导致了表观热导率的层次结构。内部结构使表观热导率降低了75%，而在水泥油墨中加入埃洛石纳米粘土使表观热导率降低了14%。在测试的内部结构中，直线结构的表观热导率比三维蜂窝结构高10-15%，比阿基米德结构高35-40%。该研究展示了一种利用3D打印方法制造和评估具有热管理能力的水泥基材料的有前景的策略。
