Textured Epoxy Coated and Galvanized Reinforcement To Reduce Cracking in Concrete Bridge Decks and Components

Ross, Brandon; Poursaee, Amir; Sreedhara, Sachin; Mueller, Matt; Clemson University. Department of Civil Engineering

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Textured Epoxy Coated and Galvanized Reinforcement To Reduce Cracking in Concrete Bridge Decks and Components

2021-10-01
By Ross, Brandon ; Poursaee, Amir ; Sreedhara, Sachin ; ...

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Creators:

Ross, Brandon ; Poursaee, Amir ; Sreedhara, Sachin ; Mueller, Matt

Ross, Brandon ; Poursaee, Amir ; Sreedhara, Sachin ; Mueller, Matt Less -
Corporate Creators:

Clemson University. Department of Civil Engineering
Corporate Contributors:

Wisconsin. Dept. of Transportation. Research and Library Unit ; United States. Department of Transportation. Federal Highway Administration ; Wisconsin Highway Research Program

Wisconsin. Dept. of Transportation. Research and Library Unit ; United States. Department of Transportation. Federal Highway Administration ; Wisconsin Highway Research Program Less -
Subject/TRT Terms:

[+]

Bond Bridge Decks Concrete Bridges Cracking Epoxy Coated Rebar Epoxy Coatings Galvanized Rebar Reinforcing Bars Roughness
Publication/ Report Number:

WisDOT ID no. 0092-19-01
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report, 2019-2021
Corporate Publisher:

Wisconsin. Dept. of Transportation. Research and Library Unit ; Wisconsin Highway Research Program

Wisconsin. Dept. of Transportation. Research and Library Unit ; Wisconsin Highway Research Program Less -
Abstract:

The objective of this project was to evaluate the influence of different reinforcing bar surface coatings on crack control performance. Five different reinforcing bar coatings were used: black (uncoated), conventional (smooth) epoxy, textured-epoxy, hot-dipped galvanized, and continuously galvanized coatings. Five different series of laboratory tests were conducted to evaluate the impact of coatings on bar-concrete bond, shrinkage cracking, static flexural cracking, and cyclic flexural cracking. Similar trends were observed throughout all tests, with textured epoxy-coated bars providing superior bond and crack control performance. Performance (percentages relative to the average performance of all the bar types) are summarized as: black (uncoated) bars performed 10% better in load tests and 2% worse in shrinkage tests, smooth epoxy coated bars performed 27% worse in load tests, and 8% worse in shrinkage tests, textured epoxy-coated bars performed 15% better in load tests and 15% better in shrinkage tests, hot-dipped galvanized bars performed 5% better in shrinkage tests (and were not evaluated in load tests) and continuously galvanized bars performed 3% worse in load tests and 8% worse in shrinkage tests. Two field studies were also conducted on the same bridge construction project. The bridge deck did not crack during the research period and comparisons in bar performance could not be made based on the deck. Girders with textured-epoxy bars as bottom flange confinement tended to have smaller flange cracks and larger web cracks than girders with smooth epoxy and hot-dipped galvanized bars. While this observation was consistent with theory, the mixed results do not lead to definitive conclusions regarding the best bar coating for girder confinement reinforcement.
Format:

PDF
Funding:

0092-19-01
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:4bd010e6d16eaf3861c7e7468acf9e94994701c1b2c89746ec183539f8e09967
Download URL:

https://rosap.ntl.bts.gov/view/dot/62705/dot_62705_DS1.pdf
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Textured Epoxy Coated and Galvanized Reinforcement To Reduce Cracking in Concrete Bridge Decks and Components

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