Generic Corrosion Damage Modeling Frameworks for Traditional and Alternative Cementitous Matrices

钢筋的腐蚀是混凝土结构中最普遍的劣化机制之一，并且美国民用基础设施的腐蚀的年度成本估计为约250亿美元。因此，开发创新的，廉价的，普遍有效的腐蚀缓解策略，以新的耐腐蚀钢，腐蚀抑制剂和替代水泥的形式，是很重要的。虽然这些材料的开发已经引起了人们的关注，但由于与其长期耐用性和性能问题相关的不确定性，它们的广泛采用受到限制。试错程序，以生产新的和负担得起的材料，以抵抗钢筋腐蚀的混凝土已在很大程度上，无效。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使用建模框架来设计，优化和评估新材料，以具有成本效益的方式缓解钢筋混凝土结构中与钢筋腐蚀相关的问题。 PI将继续通过该大学的暑期科学与工程青年项目的经验，本研究的目标是建立一个完全耦合的通用反应-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引起的恶化。这项研究的独特之处在于将热力学计算与混凝土中可能发生的运输，腐蚀和损坏现象的模型反应相结合。 腐蚀产物的形成及其在多孔微观结构中的分布将在有和没有腐蚀引起的裂缝的混凝土中进行模拟。模拟反应的热力学计算的一般性质允许模拟使用传统和替代粘合剂生产的结构部件中的腐蚀引起的损坏。这些模型对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筋腐蚀造成的损坏，以便采取先发制人的缓解措施，并优先进行必要的维修。这项研究需要一个多学科的方法，使公众的建模框架，使这些不同背景的研究人员在一般的工程社区可以使用，扩展或应用它在相关领域的调查。

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.