CAREER: Towards Perpetually Limited Corrosion of Steel in Concrete with Tailored Interfaces

事业：通过定制界面永久限制混凝土中钢的腐蚀

• 批准号: 2338983
• 负责人: Christopher Alexander
• 金额: $ 59.31万
• 依托单位: University of South Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-07-01 至 2029-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2338983&HistoricalAwards=false
• 关键词: CAREER; Towards; Perpetually; Limited; Corrosion

This Faculty Early Career Development (CAREER) award will support integrated research and education thrusts aimed at maximizing the sustainability and durability of reinforced concrete infrastructure. Corrosion of steel continues to be a limiting factor in the durability of reinforced concrete and has prevented the use of novel and otherwise durable carbon-dioxide consuming cement and concrete. This project will identify optimal steel and concrete interface conditions that can perpetually limit chloride influenced corrosion damage considering both traditional and sustainable alternative concrete mixture formulations. The research effort will be integrated with an education goal to improve the ability of civil engineering students and practitioners to address often overlooked corrosion durability issues in civil infrastructure. Research experiences for high school students will be used to enhance interests in STEM careers among underrepresented groups. Corrosion damage forecasting modules disseminated and administered through an internationally recognized corrosion organization will provide a knowledge foundation and skill set to civil engineering practitioners tasked with ensuring the durability of civil infrastructure.The research objective is to characterize the multi-scale evolution of steel corrosion within concrete considering the condition of the steel and concrete interface. Corrosion starts as small, localized pits that can grow and accumulate into more widespread corrosion damage. However, under some conditions the pits can stop growing by the process of repassivation. The project aims to: 1) identify steel and concrete interface conditions required to promote repassivation of chloride-induced pitting corrosion, 2) establish the mechanisms controlling pit shape evolution and damage progression, and 3) identify optimally corrosion resistant interface conditions based on multi-scale damage forecasting models calibrated to exposure testing results. The ability of the interface condition to promote repassivation of localized pits will be quantified according to pit stability coefficients measured by single pit growth experiments accounting for cathodic limitations due to moisture levels and the porous-reactive nature of binder formulations. Split bipolar electrochemistry coupled with a multi-physics model will yield pit growth kinetics and shape evolution considering the quality of the steel and concrete interface. A multi-scale corrosion damage forecasting model that can simulate the transition of localized pitting corrosion to macro-scaled corrosion damage will be used to inform optimal interface conditions that maximize corrosion durability considering traditional and novel carbon-sequestering concrete formulations. The results of this work will enable the development of performance-based specifications for the design of perpetually limited corrosion of reinforced concrete 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.

该教师早期职业发展（职业）奖将支持旨在最大化钢筋混凝土基础设施的可持续性和耐用性的综合研究和教育推力。钢的腐蚀仍然是钢筋混凝土耐用性的一个限制因素，并阻止了新型和其他耐用的二氧化碳消耗水泥和混凝土的使用。该项目将确定最佳的钢和混凝土界面条件，这些条件可能会永久限制氯化物影响腐蚀损害，考虑到传统和可持续的替代混凝土混合物配方。研究工作将与教育目标集成，以提高土木工程学生和从业人员解决民用基础设施中经常被忽视的腐蚀耐用性问题的能力。高中生的研究经验将用于增强代表性不足的群体中STEM职业的兴趣。通过国际认可的腐蚀组织传播和管理的腐蚀损害预测模块将为土木工程从业人员提供知识基础和技能，该实践者的任务是确保民用基础设施的耐用性。该研究目标是表征钢腐蚀的多尺度钢腐蚀性在具体的状态，以考虑钢和固定界面的状态。腐蚀始于小的局部坑，可以生长并积聚成更广泛的腐蚀损害。但是，在某些情况下，坑可以通过重新启动过程而停止增长。该项目的目的是：1）确定促进氯化物诱导的点腐蚀的重新激活所需的钢和混凝土界面条件，2）建立控制坑形进化和损伤进程的机制，以及3）确定基于基于多层尺度损伤预测模型的多尺度损伤预测模型校准曝光测试结果的最佳耐腐蚀界面条件。界面条件促进局部凹坑重新激活的能力将根据通过单坑生长实验测量的PIT稳定系数来量化，从而考虑了由于水分水平和粘合剂配方的多孔反应性而导致的阴极限制。考虑到钢和混凝土界面的质量，分裂的双极电化学以及多物理模型将产生凹坑生长动力学和形状进化。一个多尺度腐蚀损伤预测模型，该模型可以模拟局部点蚀腐蚀向宏观腐蚀损伤的过渡，以告知最佳界面条件，以考虑传统和新颖的碳序列化混凝土配方，从而最大程度地提高了腐蚀耐用性。这项工作的结果将使基于绩效的规格开发，以设计钢筋混凝土基础设施的永久腐蚀腐蚀。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点和更广泛影响的评估标准来通过评估来进行评估的。