Strong and Multifunctional Geopolymer Composites: A Multi-Scale Study

坚固且多功能的地质聚合物复合材料：多尺度研究

• 批准号: 1727922
• 负责人: Ange-Therese Akono
• 金额: $ 33.45万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-15 至 2018-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1727922&HistoricalAwards=false
• 关键词: Strong; Multifunctional; Geopolymer; Composites; Multi

This award supports fundamental research to provide new knowledge that paves the way for a systematic design of advanced geopolymer composites. Geopolymer composites are a new class of amorphous polymeric hybrids with attractive attributes that have the potential to drastically change the way composites materials are synthesized. Geopolymer-based hybrids are relevant to a vast array of fields such as civil, aerospace, mechanical, and biomedical engineering. However, established relationships between performance, chemistry, and composition are lacking. As a consequence, the widespread application of geopolymer-based materials has been impeded, despite their high potential. The integration of cutting-edge experiments with advanced computational modeling will accelerate the discovery of high-performance multifunctional structural composites. Geopolymer composites have been theorized for many interdisciplinary applications including enhanced-performance construction materials, passive cooling systems for buildings, biomaterials for bone repair, membranes for clean energy generation, and sound insulation systems. Therefore, results from this research will benefit the U. S. economy and society, and spur materials discovery. This research involves the collaboration between three institutions and across disciplines including nanoscience, solid mechanics, and materials science. Comprehensive outreach activities will be implemented in collaboration with local high schools to contribute to raising the next generation of materials scientists. Therefore, the multi-disciplinary approach will help broaden participation of underrepresented groups in research and positively impact engineering education.Geopolymers are amorphous inorganic polymers that result from the reaction between an aluminosilicate source and an alkali metal hydroxide or silicate solution. Despite a wealth of studies, the origin of the strength of geopolymer composites is not fully understood. This research is to fill the knowledge gap by connecting the effective response to the micro- and nano- constituents based on continuum and computational micromechanics integrated with nanoscale mechanical characterization methods. The research team will formulate a theoretical micromechanics model to predict the macroscopic constitutive behavior, articulate new variational solutions using the modified secant approach within nonlinear homogenization theory, build a periodic microfield finite element model that accounts for multiaxial loading cases as well as morphological features, test the hypothesis that nano-porosity is the driving factor controlling the macroscopic mechanical response, validate the theoretical models by carrying out nano- and macro-scale mechanical tests on microsphere-reinforced potassium-based geopolymer composites, and establish correlations between nano- and micro-scale characteristics and the macroscopic behavior.

该奖项支持基础研究，提供新知识，为先进地质聚合物复合材料的系统设计铺平道路。地质聚合物复合材料是一类新型的无定形聚合物杂化材料，具有引人注目的属性，有可能彻底改变复合材料的合成方式。基于地质聚合物的混合物与民用、航空航天、机械和生物医学工程等众多领域相关。然而，性能，化学和成分之间的关系是缺乏的。因此，地质聚合物基材料的广泛应用受到阻碍，尽管它们具有很高的潜力。尖端实验与先进计算建模的结合将加速高性能多功能结构复合材料的发现。地质聚合物复合材料已被理论化用于许多跨学科的应用，包括增强性能的建筑材料，建筑物的被动冷却系统，用于骨骼修复的生物材料，用于清洁能源发电的膜和隔音系统。因此，这项研究的结果将有利于美国。S.经济和社会，并刺激材料发现。这项研究涉及三个机构之间的合作和跨学科，包括纳米科学，固体力学和材料科学。将与当地高中合作开展全面的外联活动，为培养下一代材料科学家做出贡献。因此，多学科的方法将有助于扩大研究中代表性不足的群体的参与，并对工程教育产生积极影响。地质聚合物是由铝硅酸盐源与碱金属氢氧化物或硅酸盐溶液之间反应产生的无定形无机聚合物。尽管进行了大量的研究，但地质聚合物复合材料强度的起源尚未完全了解。本研究将基于连续介质和计算微观力学的有效响应与纳米尺度力学表征方法相结合，填补了这一知识空白。研究小组将制定一个理论微观力学模型来预测宏观本构行为，使用非线性均匀化理论中的修改割线方法阐明新的变分解，建立一个周期性微观有限元模型，该模型考虑多轴载荷情况以及形态特征，测试纳米孔隙率是控制宏观力学响应的驱动因素的假设，通过对微球增强的钾基地质聚合物复合材料进行纳米和宏观尺度的力学测试来验证理论模型，并建立纳米和微米尺度特征与宏观行为之间的相关性。

项目成果

Influence of pore structure on the strength behavior of particle- and fiber-reinforced metakaolin-based geopolymer composites

• DOI: 10.1016/j.cemconcomp.2019.103361
• 发表时间: 2019-11-01
• 期刊: CEMENT & CONCRETE COMPOSITES
• 影响因子: 10.5
• 作者: Akono, Ange Therese;Koric, Seid;Kriven, Waltraud M.
• 通讯作者: Kriven, Waltraud M.