Corrosion studies of fly ash and fly ash-slag based geopolymer
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my.unimap-745892022-03-07T08:31:52Z Corrosion studies of fly ash and fly ash-slag based geopolymer Farah Farhana, Zainal Siti Farahnabilah, Muhd Amli Kamarudin, Hussin Azmi, Rahmat Mohd Mustafa Al Bakri, Abdullah farahfarhana@unimap.edu.my Center of Excellence Geopolymer and Green Technology (CEGeoGTech), School of Materials Engineering, Universiti Malaysia Perlis (UniMAP) Faculty of Engineering Technology, Universiti Malaysia Perlis (UniMAP) Geopolymers Fly ash Fly ash geopolymer (FG) Fly ash-slag geopolymer (FSG) Link to publisher's homepage at https://iopscience.iop.org/ This paper presents the results of corrosion studies between Fly Ash Geopolymer (FG) paste and Fly Ash-Slag Geopolymer (FSG) paste. Geopolymer was made from aluminosilicate inorganic polymers mixed with the alkaline activator in order to reduce the carbon dioxide (CO₂) to the ecosystem. Samples then were cured at 60ºC for 24 hours in the oven. Reinforcement bar is placed at the center of the paste. The samples were examined after 7, 14 and 28 days in terms of Open Circuit Potential (OCP) test, phase analysis and morphology analysis. The potential values regarding OCP test for FSG paste from 7 days until 28 days are 0.464 V, 0.474 V and 0.498 V more positive than FG paste which the potential values are 0.087 V, 0.133 V and 0.206 V respectively. From the Pourbaix diagram, all the potential values for FG paste and FSG paste were located in the same Fe₂O₃, passivity region. Passive layer which is the oxide form exists in this region to protect the reinforcement bar from corrosion agents. It can be proved from phase analysis results which iron oxide hydroxide (FeOOH), hematite (Fe₂O₃) and magnetite (Fe₃O₄) peaks exist. The differences of morphological structures of these pastes were observed by Scanning Electron Microscope (SEM). It shows that FSG paste had good corrosion resistance and low corrosion rate compared to FG paste. 2022 2022-03-07T08:31:52Z 2022-03-07T08:31:52Z 2017-06 Article IOP Conference Services: Material Sciences Engineering, vol.209, 2017, 7 pages 1757-899x (online) http://dspace.unimap.edu.my:80/xmlui/handle/123456789/74589 https://doi.org/10.1088/1757-899x/209/1/012026 en International Conference on Innovative Research (ICIR Euroinvent 2017); IOP Publishing Ltd |
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Malaysia |
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Universiti Malaysia Perlis |
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http://dspace.unimap.edu.my/ |
| language |
English |
| topic |
Geopolymers Fly ash Fly ash geopolymer (FG) Fly ash-slag geopolymer (FSG) |
| spellingShingle |
Geopolymers Fly ash Fly ash geopolymer (FG) Fly ash-slag geopolymer (FSG) Farah Farhana, Zainal Siti Farahnabilah, Muhd Amli Kamarudin, Hussin Azmi, Rahmat Mohd Mustafa Al Bakri, Abdullah Corrosion studies of fly ash and fly ash-slag based geopolymer |
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Link to publisher's homepage at https://iopscience.iop.org/ |
| author2 |
farahfarhana@unimap.edu.my |
| author_facet |
farahfarhana@unimap.edu.my Farah Farhana, Zainal Siti Farahnabilah, Muhd Amli Kamarudin, Hussin Azmi, Rahmat Mohd Mustafa Al Bakri, Abdullah |
| format |
Article |
| author |
Farah Farhana, Zainal Siti Farahnabilah, Muhd Amli Kamarudin, Hussin Azmi, Rahmat Mohd Mustafa Al Bakri, Abdullah |
| author_sort |
Farah Farhana, Zainal |
| title |
Corrosion studies of fly ash and fly ash-slag based geopolymer |
| title_short |
Corrosion studies of fly ash and fly ash-slag based geopolymer |
| title_full |
Corrosion studies of fly ash and fly ash-slag based geopolymer |
| title_fullStr |
Corrosion studies of fly ash and fly ash-slag based geopolymer |
| title_full_unstemmed |
Corrosion studies of fly ash and fly ash-slag based geopolymer |
| title_sort |
corrosion studies of fly ash and fly ash-slag based geopolymer |
| publisher |
IOP Publishing Ltd |
| publishDate |
2022 |
| url |
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/74589 |
| _version_ |
1729704778681810944 |
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13.214268 |