CAREER: Understanding Behavior and Properties of Nano-Sized Particles in Cement-Based Materials

职业：了解水泥基材料中纳米颗粒的行为和性能

• 批准号: 1454574
• 负责人: Kay Wille
• 金额: $ 50万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1454574&HistoricalAwards=false
• 关键词: CAREER; Understanding; Behavior; Properties; Nano

This Faculty Early Career Development (CAREER) award will investigate the behavior and properties of nano-sized particles in cement-based materials. Nanoparticles have the potential to lead to more dense materials, and to carry over specific functionalities leading to novel material design possibilities, such as intelligent multi-functional highly durable engineered concretes. These design possibilities will allow for enhanced performance control and will increase the potential in effectively addressing the current poor condition of the nation's aging infrastructure as well as prepare for future infrastructure concerns. Unlocking the full potential of nano-sized particles in cement-based systems is currently held back by the limited understanding of the mechanisms by which they disperse throughout the concrete matrix. This information is critical for understanding and improving the strength and durability of the material. This award supports fundamental research to provide needed knowledge for high quality dispersion of nano-particles in cement-based systems. Meaningful impacts will be created through educational outreach activities by a) sharing newly gained knowledge for the advancement of the cement based technology, b) inspiring and motivating the next generation to pursue science, technology, engineering and mathematics (STEM), letting them discover their potential of creativity, and c) connecting knowledge of various science disciplines to enhance the interaction between civil engineers, materials scientists and chemists. Inspired by biology and life science, the centerpiece of the educational impact is creating 3D visualization of particle dispersion mechanisms. The research objective of this CAREER award is to examine and understand the dispersion mechanisms of nano-sized pozzolans in cement-based composites. The central hypothesis is that enhancing the chemical bond energy between polymer and nanoparticle (100 nm) in addition to improving the stabilization forces between polymer-particle units in cement based matrix will lead to better dispersion quality and densification of the matrix. In pursuit of this hypothesis the proposed research is subdivided into the following five interconnected research aims, 1) constituents characterization, 2) polymer synthesis and characterization, 3) particle-polymer interfacial interactions, 4) nanoparticle stabilization and 5) concrete density assessment. A multi-method investigation is proposed to study the intriguing complex dispersion mechanisms. The main challenge of the proposed research is to isolate interconnected mechanisms to reduce the system complexity. Controlled polymer synthesis and controlled ionic concentration of the cement based pore solution are examples of facilitating the isolation of parameters influencing adsorption kinetics and dispersion mechanisms.

这个教师早期职业发展（CAREER）奖将调查水泥基材料中纳米颗粒的行为和性质。纳米颗粒有可能导致更致密的材料，并携带特定的功能，从而导致新的材料设计的可能性，如智能多功能高耐久性工程混凝土。这些设计可能性将允许增强性能控制，并将增加有效解决国家老化基础设施目前状况不佳的潜力，并为未来的基础设施问题做好准备。目前，由于对纳米颗粒在混凝土基质中分散的机制了解有限，无法充分发挥纳米颗粒在水泥基系统中的潜力。这些信息对于理解和提高材料的强度和耐久性至关重要。该奖项支持基础研究，为纳米颗粒在水泥基系统中的高质量分散提供所需的知识。将通过教育推广活动产生有意义的影响，具体做法是：a）分享新获得的知识，促进水泥基技术的发展; B）激励和激励下一代追求科学、技术、工程和数学（STEM），让他们发现自己的创造潜力; c）将各种科学学科的知识结合起来，加强土木工程师之间的互动，材料科学家和化学家。受生物学和生命科学的启发，教育影响的核心是创建粒子分散机制的3D可视化。 该奖项的研究目标是研究和理解纳米级火山灰在水泥基复合材料中的分散机制。中心假设是，除了提高水泥基基质中聚合物-颗粒单元之间的稳定力之外，提高聚合物和纳米颗粒（100 nm）之间的化学键能将导致基质的更好的分散质量和致密化。为了实现这一假设，提出的研究被细分为以下五个相互关联的研究目标，1）组分表征，2）聚合物合成和表征，3）颗粒-聚合物界面相互作用，4）纳米颗粒稳定化和5）混凝土密度评估。提出了一种多方法的研究，以研究有趣的复杂的分散机制。所提出的研究的主要挑战是隔离互连的机制，以降低系统的复杂性。水泥基孔隙溶液的受控聚合物合成和受控离子浓度是促进影响吸附动力学和分散机制的参数分离的实例。