Collaborative Research: Understanding Mechanism of Internal Frost-Induced Damage of Concrete from Microstructure Aspects

“该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。“该项目将研究和教育结合起来，以提高对波特兰水泥混凝土在冻融循环下霜冻引起的破坏机制的认识。该研究项目的主要目标是将基于微观结构的计算建模和创新传感器技术的专业知识联合收割机结合起来，研究混凝土中冻害的基本机制。研究将包括不同长度尺度的混凝土微观结构的实验表征，创新的时域反射（TDR）传感器的开发，以准确地确定冻融状态，以及霜冻引起的损伤模型的制定和验证。 这项研究预计将导致一个模型，可以清楚，简洁地描述霜冻可能造成的损害，在混凝土。 该模型将提供一个有价值的工具，以评估潜在的成功的各种霜冻损害预防策略和产品。 该研究将有助于开发耐久性混凝土，并有益于寒冷地区混凝土设计和施工相关行业。混凝土的耐久性在这些地区发展所依赖的整个基础设施系统的可持续性方面发挥着核心作用。在这个项目中，研究和教育活动将被整合，以促进教学，培训和学习的K-12学生和教师，本科生和研究生在工程和科学，专业工程师。此外，本计画所发展之混凝土冻害机制研究方法，亦可应用于解决混凝土其他耐久性问题，如作为盐结垢及化学反应等。

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."This project integrates research and education to advance the state of knowledge of the mechanism of frost-induced damage in Portland cement concrete under freeze-thaw cycles. The primary objective of this research project is to combine expertise in microstructure-based computational modeling and innovative sensor technologies to study the fundamental mechanisms of frost damage in concrete. Research will include the experimental characterization of concrete microstructure across different length scales, the development of an innovative Time Domain Reflectometry (TDR) sensor to accurately determine the freeze-thaw status, and the formulation and validation of a frost-induced damage model. This research is expected to result in a model that can clearly and concisely describe the damage that frost can inflict in concrete. This model will provide a valuable tool to assess the potential success of various frost damage prevention strategies and products. This research will help develop durable concrete and benefit the industries involved with concrete design and construction in cold regions. The durability of concrete plays a central role in the sustainability of the whole infrastructure system on which such regions depend for their development. In this project, research and educational activities will be integrated to promote teaching, training, and learning for the K-12 students and teachers, undergraduate and graduate students in engineering and science, and professional engineers. Additionally, the methodology developed in this project for understanding the frost damage mechanisms of concrete will be applicable for solving other durability issues such as salt scaling and chemical reaction.