Two-component Robotic Extrusion Additive Manufacturing of Concrete Structures: Silicone-solution Phases and Fiber Distributions for Functionally Graded Materials

混凝土结构的双组分机器人挤压增材制造：功能梯度材料的有机硅溶液相和纤维分布

• 批准号: 2217985
• 负责人: Reza Moini
• 金额: $ 43.12万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-11-01 至 2026-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2217985&HistoricalAwards=false
• 关键词: Two; component; Robotic; Extrusion; Additive

Additive manufacturing using concrete materials has a potential to revolutionize the future of building infrastructure constructions. Current additive manufacturing techniques, however, are limited in their ability to produce more structurally robust concrete, mainly because of employing a single material in the process and complex process physics in concrete-mixture extrusion. This award supports fundamental research to advance two-component robotic additive manufacturing (with concrete and adjustable chemical liquid phase) that provides an innovative method to create cutting-edge designs and manufacturing of concrete components. The project brings together work on the science of an extrusion-based process with materials and chemistry research, achieving concrete materials with properties that can be engineered and tuned across fabricated layers, namely, to produce functional gradient. The two-component extrusion additive manufacturing investigated can be applied to develop highly engineered infrastructure components and will benefit the construction additive manufacturing industry to better exploit the growing global market. The study will support the U.S. industry in maintaining its competitiveness in a rapidly growing technological field of concrete additive manufacturing, as it continues to spread in the construction and housing sectors. The project will also stimulate manufacturing innovations and broaden diversity through educational and outreach activities including workshop and research opportunities to high-school, undergraduate and graduate students from underrepresented groups.This research aims at a foundational understanding of the two-component extrusion process in layer-wise robotic additive manufacturing and the physical and chemical characteristics of fiber-reinforced concrete with silicone-containing hydrophilic or hydrophobic compounds to develop tunable functionally graded concrete. The primary scientific barriers in two-component extrusion reside in the need for fundamental knowledge about the physics of intermixing with two materials. This research is motivated to understand how the two-component process, together with the chemistry of the silicone-containing concrete compounds at the layered interfaces, be leveraged to tune the local gradient properties of materials and improve their load-bearing capacities. The project will elucidate (i) the underlying physical relationship between the materials' rheological properties and the processing parameters (flow rates, pressures, in-line intermixing in an extrusion nozzle) combining an experimental method and analytical model, (ii) the novel engineering of the interfacial bonding mechanisms through hydrophilic and hydrophobic chemistry, and (iii) new manufacturing of stronger and tougher functionally graded concrete materials by incorporating fiber reinforcements of various configurations investigated by an experimental-analytical-modeling approach including fracture mechanics. The enhanced materials processing knowledge gained through this project will help harness opportunities for effective designs and manufacturing of stronger engineering materials.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

使用混凝土材料的增材制造有可能彻底改变建筑基础设施建设的未来。然而，目前的增材制造技术在生产结构更坚固的混凝土方面受到限制，这主要是因为在工艺中采用单一材料，并且在混凝土混合物挤出中采用复杂的工艺物理。该奖项支持推进双组分机器人增材制造（使用混凝土和可调节化学液相）的基础研究，该研究提供了一种创新方法来创建混凝土部件的尖端设计和制造。该项目将基于挤压的工艺科学与材料和化学研究结合起来，获得具有可以在制造层上进行设计和调整的特性的混凝土材料，即产生功能梯度。研究的双组分挤出增材制造可用于开发高度工程化的基础设施部件，并将有利于建筑增材制造行业更好地开拓不断增长的全球市场。随着混凝土增材制造技术在建筑和住房领域的不断普及，这项研究将支持美国工业在快速发展的混凝土增材制造技术领域保持竞争力。该项目还将通过教育和推广活动刺激制造创新并扩大多样性，包括为来自弱势群体的高中生、本科生和研究生提供研讨会和研究机会。这项研究旨在对分层中的双组分挤出过程有基本的了解。明智的机器人增材制造以及含有含硅亲水或疏水化合物的纤维增强混凝土的物理和化学特性，以开发可调节的功能级配混凝土。双组分挤出的主要科学障碍在于需要有关两种材料混合的物理原理的基础知识。这项研究的目的是了解如何利用双组分过程以及层状界面处含硅混凝土化合物的化学性质来调整材料的局部梯度特性并提高其承载能力。该项目将结合实验方法和分析模型，阐明（i）材料流变特性与加工参数（流量、压力、挤出喷嘴中的在线混合）之间的潜在物理关系，（ii）新颖的工程通过亲水和疏水化学研究界面粘合机制，以及（iii）通过结合通过包括断裂力学在内的实验分析建模方法研究的各种配置的纤维增强材料，新制造更强韧的功能级配混凝土材料。通过该项目获得的增强的材料加工知识将有助于利用有效设计和制造更坚固的工程材料的机会。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。