CAREER: An Integrated Research and Education Program in Long-Term Durability of Nano-Structured Cement-Based Materials during Environmental Weathering

职业：环境风化期间纳米结构水泥基材料长期耐久性的综合研究和教育计划

• 批准号: 0547024
• 负责人: Florence Sanchez
• 金额: --
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0547024&HistoricalAwards=false
• 关键词: CAREER; Integrated; Research; Education; Program

CAREER: An integrated research and education program in long-term durability of nano-structured cement-based materials during environmental weatheringF. SanchezRandomly oriented nano/microfiber (steel, carbon, or polymer) reinforced cement-based materials are an important class of composite materials with superior structural and functional properties that will open doors for new applications in civil infrastructure with the possibility of lowering total life cycle costs. It is important to gain a better understanding of the long-term durability of these materials under environmental stresses because of the critical needs that they can potentially fulfill to improve infrastructural health and function. The goal of this CAREER is to (1) develop a fundamental understanding of the controlling mechanisms of environmental weathering of nano/microfiber reinforced cement-based materials through integration of theory, experimental observation, and computational simulation focusing on how molecular level chemical phenomena at the fiber-cement interface and interfacial zone influence long-term bulk material performance and (2) educate students at multiple levels through laboratory projects, undergraduate and graduate level courses, graduate research and training, and interactive activities that reveal the relationships between material chemistry, weathering phenomena, and material durability. State-of-the-art experimental chemical, mechanical, and physical characterization of weathering mechanisms across multiple length scales (nano to macro), multi-scale computational analysis, and traditional durability testing will be integrated to (i) further elucidate the failure modes of the fiber-cement interface, and (ii) quantify and relate mechanical and chemical changes of the fiber-cement interface and interfacial zone during decalcification, carbonation, and calcium substitution/transfer to observed macro-scale properties. The educational program proposes to provide undergraduate research experience opportunities and graduate research and training, to develop a freshman seminar and course modules for the Vanderbilt-Fisk Nanoscience IGERT program, and to promote civil engineering to K-12 students through the development of interactive practical science engineering activities for classrooms disseminated through a web-based virtual laboratory. This integrated research and education program will (1) provide significant contributions toward defining the link between molecular level chemical changes and macro-scale material properties necessary to increase the predictability of cement-based material performance, (2) provide a fundamental understanding of interfacial chemistry necessary to design tailored, advanced cementitious composites that have improved durability and resistance to weathering, (3) engage student intellectual curiosity concerning the nature and properties of materials and the complex and intriguing chemical interactions that occur in cement, and (4) integrate chemistry and nanotechnologies into civil engineering education.

职业：环境Weatheringf期间纳米结构水泥材料的长期耐用性的综合研究和教育计划。 Sanchezrandomy取向的纳米/微纤维（钢，碳或聚合物）增强水泥的材料是一类重要的复合材料类，具有卓越的结构和功能性能，可为民用基础设施中的新应用打开门，并具有降低总生命周期成本的可能性。重要的是要在环境压力下更好地了解这些材料在环境压力下的长期耐用性，因为它们有可能满足基础设施健康和功能的关键需求。这项职业的目的是（1）通过整合理论，实验观察和计算模拟，重点是分子水平的化学现象，通过在纤维水平和互动级别的层次上培训学生（2），通过理论，实验性观察和计算模拟，通过整合分子水平的化学现象，通过在长期材料级别上进行多重级别（2），（2）通过对分子水平的化学现象进行多种级别（2），从而，对纳米/微纤维增强水泥的基于水泥的环境风化的控制机制有了基本的理解。课程，研究生研究和培训以及互动活动，这些活动揭示了物质化学，风化现象和物质耐用性之间的关系。跨多个长度尺度（纳米到宏），多尺度计算分析和传统耐用性测试的风化机制的最新实验化学，机械和物理表征将集成到（i）以进一步阐明光纤接口的失败模式，以及（ii）量化和相关性和化学界面和化学界面和化学界面和化学界面的启发性和化学界面的启发性和化学界面，并在启发界面变化，并进行了启发和化学界面。取代/转移到观察到的宏观尺度特性。该教育计划建议为范德比尔特 - 风险纳米科学Igert计划提供新生研讨会和课程模块，为新生研讨会和课程模块开发新生研讨会和课程模块，并通过开发互动性实用科学工程活动，以通过基于网络的虚拟实验室来开发互动式实用科学工程活动，以促进K-12学生的土木工程。该集成的研究和教育计划（1）将为定义分子水平的化学变化与宏观尺度材料的联系提供重要贡献，这是提高基于水泥材料的可预测性所必需的，（2）提供了对设计量身定制的界面化学的基本理解，该界面化学是设计了量身定制的界面化学方法，这些化学对于具有改善了材料和材料的材料且具有材料的能力和构图（3）的材料（3）的材料效率（3），（3）水泥中发生的有趣的化学相互作用，以及（4）将化学和纳米技术整合到土木工程教育中。