Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl Solution
This research focuses on an experimental investigation to identify the effects of fly ash on the electrochemical process of concrete during the curing time. A rebar was analysed using potentiostat to measure the rest potential, polarization diagram, and corrosion rate. Water-to-cement ratio and amou...
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2016-01-01
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Series: | International Journal of Corrosion |
Online Access: | http://dx.doi.org/10.1155/2016/3853045 |
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doaj-5efa6ea384264d4b92fa8d91f62b87022020-11-24T23:14:26ZengHindawi LimitedInternational Journal of Corrosion1687-93251687-93332016-01-01201610.1155/2016/38530453853045Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl SolutionY. P. Asmara0J. P. Siregar1C. Tezara2Wan Nurlisa3J. Jamiluddin4Department of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, MalaysiaDepartment of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, MalaysiaDepartment of Mechanical Engineering, Faculty of Science, Technology, Engineering and Mathematics, INTI International University, 71800 Nilai, Negeri Sembilan, MalaysiaDepartment of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, MalaysiaDepartment of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, MalaysiaThis research focuses on an experimental investigation to identify the effects of fly ash on the electrochemical process of concrete during the curing time. A rebar was analysed using potentiostat to measure the rest potential, polarization diagram, and corrosion rate. Water-to-cement ratio and amount of fly ash were varied. After being cured for 24 hours at a temperature of 65°C, the samples were immersed in 3.5% of NaCl solution for 365 days for electrochemical measurement. Measurements of the half-cell potential and corrosion current density indicated that the fly ash has significant effects on corrosion behaviour of concrete. Although fly ash tends to create passivity on anodic current, it increases corrosion rate. The corrosion potential of this concrete mixture decreases compared to concrete without fly ash. From the result, it can be summarized that concrete mixture with 70% of OPC (Ordinary Portland Cement) and 30% fly ash has shown the best corrosion resistance.http://dx.doi.org/10.1155/2016/3853045 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Y. P. Asmara J. P. Siregar C. Tezara Wan Nurlisa J. Jamiluddin |
spellingShingle |
Y. P. Asmara J. P. Siregar C. Tezara Wan Nurlisa J. Jamiluddin Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl Solution International Journal of Corrosion |
author_facet |
Y. P. Asmara J. P. Siregar C. Tezara Wan Nurlisa J. Jamiluddin |
author_sort |
Y. P. Asmara |
title |
Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl Solution |
title_short |
Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl Solution |
title_full |
Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl Solution |
title_fullStr |
Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl Solution |
title_full_unstemmed |
Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl Solution |
title_sort |
long term corrosion experiment of steel rebar in fly ash-based geopolymer concrete in nacl solution |
publisher |
Hindawi Limited |
series |
International Journal of Corrosion |
issn |
1687-9325 1687-9333 |
publishDate |
2016-01-01 |
description |
This research focuses on an experimental investigation to identify the effects of fly ash on the electrochemical process of concrete during the curing time. A rebar was analysed using potentiostat to measure the rest potential, polarization diagram, and corrosion rate. Water-to-cement ratio and amount of fly ash were varied. After being cured for 24 hours at a temperature of 65°C, the samples were immersed in 3.5% of NaCl solution for 365 days for electrochemical measurement. Measurements of the half-cell potential and corrosion current density indicated that the fly ash has significant effects on corrosion behaviour of concrete. Although fly ash tends to create passivity on anodic current, it increases corrosion rate. The corrosion potential of this concrete mixture decreases compared to concrete without fly ash. From the result, it can be summarized that concrete mixture with 70% of OPC (Ordinary Portland Cement) and 30% fly ash has shown the best corrosion resistance. |
url |
http://dx.doi.org/10.1155/2016/3853045 |
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