Novel Coating Technology for Improving the Corrosion Resistance and Mechanical Properties of Reinforcing Steel in Concrete

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.


  • English


  • Status: Active
  • Contract Numbers:

    Project 20-30, IDEA

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Jawed, Inam

  • Performing Organizations:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  United States  78228-0510
  • Principal Investigators:

    Caseres, Leonardo

  • Start Date: 20141212
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 38387

Subject/Index Terms

Filing Info

  • Accession Number: 01547688
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-30, IDEA
  • Files: TRB, RiP
  • Created Date: Dec 13 2014 1:01AM