Development and Characterization of Reative Enamel-Coated Steel Rebars for Improved Concrete-Steel Bonding and Enhanced Corrosion Resistance

“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。“这项研究的目的是开发一种化学结合的反应搪瓷涂层钢筋，耐腐蚀，并提高钢筋与周围混凝土之间的粘结强度。工作范围包括1）表征钢筋在碱性环境中的耐腐蚀性能; 2）表征和量化钢筋和混凝土之间的长期粘结强度，包括物理和化学效应，包括？自我修复搪瓷涂层上产生的裂缝的行为; 3）确定钢筋在静态和循环荷载下在钢筋混凝土结构中的总体意义。新技术的优化将通过定制搪瓷组合物来实现，以与钢形成化学牢固的结合，并与周围的水泥基质反应并形成牢固的结合。增加的粘结强度将通过测试一个大型梁柱结构来验证。在美国，腐蚀每年造成近100亿美元的桥梁支出，间接成本接近每年10倍。钢筋防腐涂层技术的发展将产生巨大的经济影响。该项目代表了材料科学家和结构工程师的合作，有两名博士参与。学生和一个或多个本科生，特别是那些来自代表性不足的群体。学生们将分别在专业会议和校园年度本科生研究会议上展示他们的成果。

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."This study is aimed at developing a chemically-bonded reactive enamel-coated steel rebar that is corrosion resistant, and enhances the bond strength between the rebar and its surrounding concrete. The scope of work includes 1) Characterize the corrosion resistant properties of the rebar in alkaline environments; 2) Characterize and quantify the long-term bond strength between the rebar and concrete both for physical and chemical effects, including the ?self-healing? behavior of cracks induced on enamel coating; 3) Determine the overall significance of the rebar in reinforced concrete structures under static and cyclic loading. The optimization of the new technology will be achieved by tailoring enamel compositions to create chemically strong bonds to steel, and to react and form a strong bond to the surrounding cement matrix. The increased bond strength will be validated by testing a large-scale beam-column structure.Corrosion is responsible for annual bridge expenditures in the United States of nearly $10 billion with indirect costs approaching 10 times that amount per year. The development of a corrosion-resistant coating technology for steel rebar will have a huge economic impact. This project represents a collaboration of materials scientists and structural engineers with strong participations of two Ph.D. students and one or more undergraduate students, particularly those from underrepresented groups. The students will present their results at professional meetings and at the annual undergraduate research conference on campus, respectively.