Behavior of alkali-activated fly ash through underwater placement
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my.unimap-729792021-12-23T02:13:08Z Behavior of alkali-activated fly ash through underwater placement Zarina, Yahya Mohd Mustafa Al Bakri, Abdullah Li, Long-yuan Nergis, Dumitru Doru Burduhos Muhammad Aiman Asyraf, Zainal Hakimi Sandu, Andrei Victor Vizureanu, Petrica Rafiza, Abd Razak zarinayahya@unimap.edu.my sav@tuiasi.ro peviz@tuiasi.ro Centre of Excellence Geopolymer and Green Technology (CEGeoGTech)¹ Faculty of Civil Engineering Technology, Universiti Malaysia Perlis (UniMAP)² Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis (UniMAP)³ School of Marine Science and Engineering, University of Plymouth⁴ aculty of Materials Science and Engineering, Gheorghe Asachi Technical University of Iaşi⁵ Romanian Inventors Forum⁶ Alkali-activated Underwater placement Class C fly ash Seawater Fresh water Link to publisher's homepage at https://www.mdpi.com/ Underwater concrete is a cohesive self-consolidated concrete used for concreting underwater structures such as bridge piers. Conventional concrete used anti-washout admixture (AWA) to form a high-viscosity underwater concrete to minimise the dispersion of concrete material into the surrounding water. The reduction of quality for conventional concrete is mainly due to the washing out of cement and fine particles upon casting in the water. This research focused on the detailed investigations into the setting time, washout effect, compressive strength, and chemical composition analysis of alkali-activated fly ash (AAFA) paste through underwater placement in seawater and freshwater. Class C fly ash as source materials, sodium silicate, and sodium hydroxide solution as alkaline activator were used for this study. Specimens produced through underwater placement in seawater showed impressive performance with strength 71.10 MPa on 28 days. According to the Standard of the Japan Society of Civil Engineers (JSCE), the strength of specimens for underwater placement must not be lower than 80% of the specimen’s strength prepared in dry conditions. As result, the AAFA specimens only showed 12.11% reduction in strength compared to the specimen prepared in dry conditions, thus proving that AAFA paste has high potential to be applied in seawater and freshwater applications. 2021 2021-12-23T02:04:11Z 2021-12-23T02:04:11Z 2021-11-14 Article Materials, vol. 14(22), 2021, pages 6865 1996-1944 (print) http://dspace.unimap.edu.my:80/xmlui/handle/123456789/72979 https://www.mdpi.com/journal/materials https://doi.org/10.3390/ma14226865 en MDPI AG |
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| language |
English |
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Alkali-activated Underwater placement Class C fly ash Seawater Fresh water |
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Alkali-activated Underwater placement Class C fly ash Seawater Fresh water Zarina, Yahya Mohd Mustafa Al Bakri, Abdullah Li, Long-yuan Nergis, Dumitru Doru Burduhos Muhammad Aiman Asyraf, Zainal Hakimi Sandu, Andrei Victor Vizureanu, Petrica Rafiza, Abd Razak Behavior of alkali-activated fly ash through underwater placement |
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Link to publisher's homepage at https://www.mdpi.com/ |
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zarinayahya@unimap.edu.my |
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zarinayahya@unimap.edu.my Zarina, Yahya Mohd Mustafa Al Bakri, Abdullah Li, Long-yuan Nergis, Dumitru Doru Burduhos Muhammad Aiman Asyraf, Zainal Hakimi Sandu, Andrei Victor Vizureanu, Petrica Rafiza, Abd Razak |
| format |
Article |
| author |
Zarina, Yahya Mohd Mustafa Al Bakri, Abdullah Li, Long-yuan Nergis, Dumitru Doru Burduhos Muhammad Aiman Asyraf, Zainal Hakimi Sandu, Andrei Victor Vizureanu, Petrica Rafiza, Abd Razak |
| author_sort |
Zarina, Yahya |
| title |
Behavior of alkali-activated fly ash through underwater placement |
| title_short |
Behavior of alkali-activated fly ash through underwater placement |
| title_full |
Behavior of alkali-activated fly ash through underwater placement |
| title_fullStr |
Behavior of alkali-activated fly ash through underwater placement |
| title_full_unstemmed |
Behavior of alkali-activated fly ash through underwater placement |
| title_sort |
behavior of alkali-activated fly ash through underwater placement |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/72979 |
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1724609976301780992 |
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13.214268 |