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

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.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Civil Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2021

Author dc:creator

• Zhang, Zige

Contributors dc:contributor

• Andrawes, Bassem

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

Statement dc:rights

• Copyright 2020 Zige Zhang

Language dc:language

en

Handle dc:identifier

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

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/109456