Generic Corrosion Damage Modeling Frameworks for Traditional and Alternative Cementitous Matrices

钢筋腐蚀是混凝土结构中最常见的腐蚀机制之一，美国民用基础设施腐蚀的年度成本估计约为250亿美元。因此，以新型耐腐蚀钢、缓蚀剂和替代水泥的形式开发创新的、廉价的、普遍有效的缓蚀策略是很重要的。尽管这些材料的发展受到了人们的关注，但由于其长期耐用性和性能方面的不确定性，它们的广泛采用受到了限制。在很大程度上，通过反复试验来生产新的、可负担得起的材料来抵抗混凝土中的钢腐蚀的方法是无效的。在这项工作中，pi将建立一个计算机建模框架，以评估这些不确定性并智能地预测新材料的腐蚀行为。这项研究将产生深远的社会和经济影响，使研究人员和材料开发人员能够通过建模框架来设计、优化和评估新材料，以经济有效的方式减轻钢筋混凝土结构中钢材腐蚀的相关问题。PI将继续通过该大学的青年科学与工程暑期体验项目进行推广。本研究的目的是建立一个全耦合的通用反应-传输-腐蚀-损伤模型框架，用于模拟钢筋混凝土结构构件的腐蚀退化。该研究的独特之处在于热力学计算的耦合，以模拟混凝土中可能发生的带有运输、腐蚀和损伤现象的反应。在混凝土中模拟腐蚀产物的形成及其在多孔结构中的分布，并对有无腐蚀裂缝的混凝土进行分析。模拟反应的热力学计算的一般性质允许模拟由传统和替代粘合剂生产的结构部件的腐蚀引起的损伤。这些模型对于现有的结构系统也很重要，因为它们有助于早期识别由于钢腐蚀造成的损害，从而可以采取先发制人的缓解行动，并优先进行必要的修复。这项研究需要一个多学科的方法来公开建模框架，以便来自一般工程界这些不同背景的研究人员可以在相关的研究领域使用、扩展或应用它。

Corrosion of steel reinforcement is one of the most prevalent deterioration mechanisms in concrete structures, and the annual cost of corrosion of civil infrastructure in the United States is estimated to be around $25 billion. Therefore, development of innovative, inexpensive, and ubiquitously effective corrosion mitigation strategies in the form of new corrosion-resistant steels, corrosion inhibitors, and alternative cements, is important. Although the development of these materials have been gaining attention, their widespread adoption has been limited due to uncertainties associated with their long-term durability and performance concerns. Trial-and-error procedures to produce new and affordable materials to resist steel corrosion in concrete have been, to a large degree, ineffective. In this work, the PIs will establish a computer-modeling framework that will evaluate these uncertainties and intelligently predict the corrosion behavior of new materials. This research will have far-reaching social and economic impacts by enabling researchers and material developers with a modeling framework to design, optimize, and assess new materials to mitigate issues associated with steel corrosion in reinforced concrete structures in a cost effective way. The PI will continue outreach through the university's Summer Experience in Science and Engineering for Youth program.The objective of this research is to establish a fully coupled generic reaction-transport-corrosion-damage modeling framework for simulating corrosion-induced deterioration of reinforced concrete structural components. The unique feature of the study is the coupling of thermodynamic calculations to model reactions that can take place in concrete with transport, corrosion and damage phenomena. The formation of corrosion products and their distribution within the porous microstructure will be simulated in concrete with and without corrosion induced cracks. The generic nature of thermodynamic calculations to model reactions allows the simulation of corrosion-induced damage in structural components produced with traditional and alternative binders. These models are also important for existing structural systems since they help early identification of damage due to steel corrosion so that pre-emptive mitigation actions can be pursued and necessary repairs can be prioritized. This research requires a multi-disciplinary approach to make the modeling framework public so that researchers from these different backgrounds in the general engineering community can use, expand or apply it in related fields of investigation.