Novel Coating Technology for Improving the Corrosion Resistance and Mechanical Properties of Reinforcing Steel in Concrete
| 项目名称： | Novel Coating Technology for Improving the Corrosion Resistance and Mechanical Properties of Reinforcing Steel in Concrete |
| 摘要： | This project will develop and test a coating deposition technology for improved corrosion resistance and mechanical performance of the reinforcing steel in concrete. Work in Stage 1 focuses on developing and optimizing a diamond-like carbon (s-DLC) deposition methodology under atmospheric conditions and low temperatures. Initially, flat coupons will be coated to characterize and optimize the coating application technique, chemistry, adhesion, and uniformity. The feasibility of depositing s-DLC coatings of various thicknesses over the steel surface will be examined to establish an optimal coating thickness for reinforcing steels. Work in Stage 2 will involve electrochemical testing of coated steels in simulated concrete pore solutions and after the exposure tests. This will include flat coupons, blemished and unblemished coated rebars, and bent/straightened coated rebars. The coated rebars will be exposed to three distinct environments -- simulated concrete pore solutions with target pH values of 9.7 (simulating carbonated concretes) and 13.3 (normal alkalinity concretes), and a concrete mixture typically found in bridge applications. Chloride ions will be introduced with the mixing water to accelerate corrosion of the embedded rebars. Conventional and standard electrochemical tests will be performed to determine the corrosion resistance of the s-DLC coating. After exposure, the coated rebars will be inspected for corrosion and or other damages. Additionally, mechanical testing of the coated flat coupons, rebars, and bent/straightened rebars after exposure to simulated concrete pore solutions and concrete will be performed. Coating disbondment, pull-off strength, and water contact angles will be measured and compared to other commercially available coatings. Coating brittleness will be assessed by measuring the coating ductility and adhesion. The final report will provide all relevant data and guidelines for field implementation of the technology. |
| 状态： | Active |
| 资金： | 115000.00 |
| 资助组织： | Federal Highway Administration<==>American Association of State Highway & Transportation Officials (AASHTO)<==>National Cooperative Highway Research Program |
| 项目负责人： | Jawed, Inam |
| 执行机构： | Southwest Research Institute |
| 开始时间： | 20141212 |
| 主题领域： | Bridges and other structures；Highways；I30: Materials |
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