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Anti-Corrosion Reinforcements Using Coating Technologies-A Review
Lei Yan1,2, Wenjie Deng3, Neng Wang4
1State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
Polymers
|November 11, 2022
Summary
This review examines coated reinforcements like galvanized (GRs), epoxy-coated (ECRs), stainless cladding (SCRs), and steel-fiber composite bars (SFCBs) for concrete in harsh environments. Performance varies significantly based on material type and manufacturing, impacting corrosion resistance and bond strength.
Area of Science:
- Materials Science
- Civil Engineering
- Corrosion Engineering
Background:
- Coated reinforcements are crucial for enhancing reinforced concrete durability in aggressive environments.
- Diverse properties of coated reinforcements present challenges for researchers and engineers.
- Understanding material-specific behaviors is key to selecting appropriate anti-corrosion solutions.
Purpose of the Study:
- To review the manufacture, corrosion mechanisms, behaviors, and applications of popular coated reinforcements.
- To compare galvanized reinforcements (GRs), epoxy-coated reinforcements (ECRs), stainless cladding reinforcements (SCRs), and steel-fiber reinforced polymer composite bars (SFCBs).
- To highlight performance differences and research/development needs for each type.
Main Methods:
- Literature review of coated reinforcement types.
- Analysis of manufacturing processes and their impact on performance.
- Examination of corrosion mechanisms (oxidation, hydrolysis, under-film corrosion).
- Evaluation of material behaviors, including bond strength and failure modes.
Main Results:
- Galvanized reinforcements (GRs) show controversial performance; epoxy-coated reinforcements (ECRs) have bond strength drawbacks.
- Stainless cladding reinforcements (SCRs) and steel-fiber reinforced polymer composite bars (SFCBs) are primarily affected by coat-core interaction.
- Corrosion mechanisms differ: oxidation for GRs/SCRs, hydrolysis for SFCBs, and under-film for ECRs.
- Corrosion impacts vary: embrittlement for SCRs/bare bars, strength reduction for SFCBs.
Conclusions:
- Optimizing manufacture is critical for GRs and ECRs; cost reduction and capacity increase are needed for SCRs and SFCBs.
- ECRs may lead to premature failure due to under-film corrosion.
- Regional disparities in anti-corrosion reinforcement use correlate with technological and economic development.
- Further research is needed to fully understand and optimize the performance of various coated reinforcements.
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