Evaluation of surface roughness and bond-slip behavior of new textured epoxy-coated reinforcing bars

Zhang, Zige

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https://hdl.handle.net/2142/109456 Copy

Description

Title

Evaluation of surface roughness and bond-slip behavior of new textured epoxy-coated reinforcing bars

Author(s)

Zhang, Zige

Issue Date

2020-12-11

Director of Research (if dissertation) or Advisor (if thesis)

Andrawes, Bassem

Department of Study

Civil & Environmental Eng

Discipline

Civil Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• Reinforcement
• Textured epoxy-coated
• Roughness
• Bond-slip
• Finite element analysis
• Pull-out test
• Shrinkage

Abstract

Epoxy-coated reinforcing bars are widely used in bridge decks to mitigate the corrosion of reinforcing steel. Research and practical experience both showed that the smooth epoxy coating significantly reduces the bond between concrete and reinforcing steel, which often results in the early development of transverse cracks in bridge decks. To solve this problem, the Illinois Department of Transportation (IDOT) proposed a new type of textured epoxy-coated (TEC) reinforcing bars with applied roughness to improve the bond between concrete and steel while providing corrosion protection. This study investigates the surface roughness of different types of TEC bars and how it impacts the bar’s bond-slip behavior with concrete, both experimentally and numerically. First, the surface roughness of the TEC bars is compared with that of uncoated black bars (BLK) using 2-D and 3-D roughness parameters. Second, direct pull-out tests are conducted on concrete specimens with embedded 1) BLK, 2) smooth epoxy-coated (SEC), and 3) different types of TEC bars to compare their bond characteristics. Then, multiple 3-D finite element models are developed and calibrated to simulate the bond-slip behavior of TEC bars embedded in concrete and to determine the development length of TEC bars. The numerical development length of the TEC bars is then compared with the values recommended by the American Concrete Institute and the American Association of State Highway and Transportation Officials for SEC and BLK bars. Finally, a large-scale laboratory control experiment is designed to observe the impact of the TEC bars on bridge deck shrinkage compared with that of the SEC bars.

Graduation Semester

2020-12

Type of Resource

Thesis

Permalink

http://hdl.handle.net/2142/109456

Copyright and License Information

Copyright 2020 Zige Zhang

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