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NanoEngineered Concrete Internal Conditioning for Targeted Suppression of Alkali-Silica Reaction

用于定向抑制碱硅反应的纳米工程混凝土内部调节

基本信息

批准号：
1935799
负责人：
Jianqiang Wei
金额：
$ 35.02万
依托单位：
University of Massachusetts Lowell
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1935799&HistoricalAwards=false
关键词：
NanoEngineered Concrete Internal Conditioning Targeted

项目摘要

Alkali-silica reaction (ASR) is a major deterioration mechanism causing significant expansion, cracking and damage to concrete material in service. Inspired by immunization and targeted therapy in cancer treatment, targeted suppression of ASR is the focus of this research. The existing mitigation methods are primarily targeted at single ASR prerequisites with limited efficiency and potential negative impacts on concrete performance. The primary objective of this project is to uncover the side-effect free mitigation of ASR, and then use the insights gained to guide the design of highly durable and sustainable infrastructure materials with unprecedented properties. A state-of-the-art methodology will be used by bridging the gaps between nanoengineering and cement chemistry to convert nanostructure of ASR gels to prevent volume expansion and cracking. This will lead to resilient and durable concrete thereby extending the lifetime of infrastructure and reducing the repair and maintenance costs. Overall, the acquired knowledge from this research effort will reduce the economic and societal impact of infrastructure deteriorations by providing insights for degradation preventions and service-life extension of new and existing concrete structures. The university's STEM program will be exploited to involve students in K-12 level as well as students at the undergraduate level.Nanoengineered internal conditioning of concrete material triggered by multifunctional clay nanoparticles will be exploited based on a combined thermodynamic modeling and experimental approach. A fundamental understanding of the role of the nanoengineered internal conditioning in cement hydration that can suppress formation of ASR will be investigated. The research will focus on four research thrusts at: 1. Clay level: to functionalize clay nanoparticles to improve their dispersion, reactivity and tunable functions for internal conditioning; 2. Cement level: to tailor hydration behavior, pore network, and both solid and liquid compositions; 3. ASR level: to suppress ASR formation which prevents volume expansion and cracking; and 4. Concrete level: to improve durability-related mechanical and physical properties, and resistance to multiple aging mechanisms with a goal to design truly sustainable, resilient, and durable concrete material. The success of this project would be instrumental in advancing resilience-based and problem-oriented concrete material design through nanoengineering and thermodynamic means to stratify the quality requirement and performance expectation of future infrastructure.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.

碱-硅酸反应(ASR)是引起在役混凝土材料显著膨胀、开裂和破坏的主要劣化机制。受肿瘤治疗中免疫和靶向治疗的启发，靶向抑制ASR是本研究的重点。现有的缓解方法主要针对单一的ASR先决条件，效率有限，对混凝土性能有潜在的负面影响。该项目的主要目标是揭示ASR的无副作用缓解，然后使用所获得的见解来指导具有前所未有的性能的高度耐用和可持续的基础设施材料的设计。将使用一种最先进的方法，通过弥合纳米工程和水泥化学之间的差距来转换ASR凝胶的纳米结构，以防止体积膨胀和破裂。这将导致具有弹性和耐久性的混凝土，从而延长基础设施的使用寿命，并降低维修和维护成本。总体而言，从这项研究工作中获得的知识将为预防退化和延长新的和现有混凝土结构的使用寿命提供见解，从而减少基础设施恶化对经济和社会的影响。该大学的STEM项目将涉及K-12水平的学生以及本科生。将基于热力学建模和实验相结合的方法，开发由多功能粘土纳米颗粒触发的混凝土材料的纳米工程内部调节。对纳米工程内部调节在抑制ASR形成的水泥水化中的作用的基本理解将被调查。这项研究将集中在四个方面：1.粘土水平：使粘土纳米颗粒功能化，以改善其分散性、反应性和内部调节功能；2.水泥水平：调整水化行为、孔隙网络以及固体和液体组成；3.ASR水平：抑制ASR的形成，防止体积膨胀和裂缝；以及4.混凝土水平：改善与耐久性相关的力学和物理性能，以及抗多种老化机制，目标是设计真正可持续、有弹性和耐久的混凝土材料。该项目的成功将有助于通过纳米工程和热力学手段来分层未来基础设施的质量要求和性能预期，推动基于弹性和面向问题的混凝土材料设计。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。