Corrosion Protection and Steel-Concrete Bond Improvement of Prestressing Strand

Anderson, Marc; Oliva, Michael; Tejedor, Isabel; National Center for Freight and Infrastructure Research and Education (U.S.); University of Wisconsin--Madison. Dept. of Civil and Environmental Engineering

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Corrosion Protection and Steel-Concrete Bond Improvement of Prestressing Strand

2012-12-01
By Anderson, Marc ; Oliva, Michael ; Tejedor, Isabel

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English

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Details:

Creators:

Anderson, Marc ; Oliva, Michael ; Tejedor, Isabel

Anderson, Marc ; Oliva, Michael ; Tejedor, Isabel Less -
Corporate Creators:

National Center for Freight and Infrastructure Research and Education (U.S.) ; University of Wisconsin--Madison. Dept. of Civil and Environmental Engineering

National Center for Freight and Infrastructure Research and Education (U.S.) ; University of Wisconsin--Madison. Dept. of Civil and Environmental Engineering Less -
Corporate Contributors:

United States. Dept. of Transportation. Research and Innovative Technology Administration
Subject/TRT Terms:

[+]

Bond Strength (Materials) Bridges And Other Structures Carbon Steel Corrosion Protection Design Highways I24: Design Of Bridges And Retaining Walls I35: Miscellaneous Materials Materials Metal Coatings Pitting Porous Materials Prestressed Concrete Bridges Pull Out Test Tensile Strength
Publication/ Report Number:

CFIRE 05-12
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

National Center for Freight and Infrastructure Research and Education (U.S.)
Abstract:

Corrosion can lead to the premature deterioration and failure of transportation structures. In pre-stressed bridge structures corrosion is more severe, leading to sudden failures when cracking is induced at pitting sites by tensile or compressive stresses. This work studies the viability and effectiveness of inorganic nanoporous coatings as corrosion protection for carbon steel prestressing strand. Inorganic nanoporous metallic coatings can offer the benefit of not reducing, but possibly enhancing the steel-concrete bond and adding some corrosion resistance to the strand. Anodic Polarization measurements of critical pitting corrosion potential were performed on Grade 270 low-relaxation steel wires from three strand manufacturers in bare and coated conditions. In addition, the wires were subjected to tensile stresses as they would be on a prestressing application and subsequently tested for pitting corrosion potential. Two metallic oxide coatings were used in this work namely acidic zirconia (ZrO2) and acidic titania (TiO2). The steel concrete bond characteristics were measured by pull-out tests based on the current NASP Bond Test Research. Finally, tension tests measure the elastic modulus and strength of the steel before and after the heat treatment involved the coating process. Findings show an increase in corrosion resistance of coated wires prior to being stressed in tension. After tensioning the wires to 80% of their ultimate capacity, the corrosion resistance generally decreases. Pull-out tests show a 100-150% increase of bond strength for coated wires. No effects on the mechanical properties of the steel can be appreciated for heated treated samples with respect to those that have not been heated.
Format:

PDF
Funding:

DTRT06-G-0020
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

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urn:sha256:1c6e985deb0c30771c97fdc7299e258b8f2a91343d3d322d3b8627a0e508631f
Download URL:

https://rosap.ntl.bts.gov/view/dot/26178/dot_26178_DS1.pdf
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Corrosion Protection and Steel-Concrete Bond Improvement of Prestressing Strand

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