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IBA-modified gypsum-containing epoxy resin coating for rebar: corrosion performance and bonding characteristics

  • Research Article
  • Published:
International Journal of Plastics Technology

Abstract

In this study, epoxy resin-based coating was developed for concrete reinforcement mild steel bar (rebar), and the corrosion behaviors of the uncoated rebar, single-cured epoxy resin-coated rebar, and indole butyric acid (IBA)-modified gypsum-containing epoxy resin-coated rebar were investigated in NaCl, CaCl2, and NaOH solution. Triethylene tetramine was used as curing agent for the epoxy resin, and IBA along with gypsum or silica was used in the composition of epoxy coating as inhibitor. Gypsum or silica was used separately as carrier of the IBA. Assessment was carried out on the basis of the corrosion resistance performance and bonding characteristics of the coated rebar. Corrosion resistance performance of the coating was evaluated using polarization resistance test, cathodic disbonding test, and corrosion-induced cracking study. Electrochemical tests showed that incorporation of IBA significantly improved the corrosion protection capacity of the epoxy coating against rebar corrosion. This was related to its healing effect on surface passivation against attack by a corrosive environment. In addition to corrosion protection capacity, bond strength between concrete and rebar is determined through pullout test. It was found that the coating has no adverse effect on the bond strength between embedded rebar and concrete, and additionally, it contributes to the bond strength due to adhesion properties of the resin.

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Acknowledgment

This study was funded by Shahjalal University of Science and Technology Research Center (SUSTRC) under the grant 2014–2015 (Grant Number nil/28.10.2014). First author of this paper received research grant from SUSTRC. The authors acknowledge the laboratory support of Housing and Building Research Institute, Dhaka, Bangladesh.

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Authors and Affiliations

  1. Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology (SUST), Sylhet, 3114, Bangladesh

    Md. Mostafizur Rahman, Md. Minhazul Islam, Md. Tamez Uddin & Md. Akhtarul Islam

  2. Faculty of Chemical and Natural Resources Engineering, University Malaysia Pahang, Pahang, Malaysia

    Md. Maksudur Rahman Khan

  3. Faculty of Engineering and Technology, DRB-HICOM University of Automotive Malaysia, Pahang, Malaysia

    Huei Ruey Ong

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  1. Md. Mostafizur Rahman
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  2. Md. Minhazul Islam
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  3. Md. Maksudur Rahman Khan
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  4. Huei Ruey Ong
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  5. Md. Tamez Uddin
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  6. Md. Akhtarul Islam
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Correspondence to Md. Mostafizur Rahman.

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Rahman, M.M., Islam, M.M., Khan, M.M.R. et al. IBA-modified gypsum-containing epoxy resin coating for rebar: corrosion performance and bonding characteristics. Int J Plast Technol 23, 20–28 (2019). https://doi.org/10.1007/s12588-019-09238-3

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  • DOI: https://doi.org/10.1007/s12588-019-09238-3

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