Tailoring sodium-based fly ash geopolymers with variegated thermal performance
Sodium-based fly ash geopolymers show great fire resistance potential and commercial advantage for structural applications. Hence, in current research, tailoring of sodium-based geopolymer mix design without changing the fly ash source has been studied. It was found that a wide variety of residual c...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/161158 |
| _version_ | 1811677914341572608 |
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| author | Lahoti, Mukund Wijaya, Stephen Fransceda Tan, Kang Hai Yang, En-Hua |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Lahoti, Mukund Wijaya, Stephen Fransceda Tan, Kang Hai Yang, En-Hua |
| author_sort | Lahoti, Mukund |
| collection | NTU |
| description | Sodium-based fly ash geopolymers show great fire resistance potential and commercial advantage for structural applications. Hence, in current research, tailoring of sodium-based geopolymer mix design without changing the fly ash source has been studied. It was found that a wide variety of residual compressive strength ranging from significant reduction (~80%) to maintaining significant enhancement (~150%) after being exposed to 900 °C was observed. The contributory mechanisms were discovered by investigating their chemical stability, pore structures, volume stability, and strength endurance prior to and after exposure to high-temperature using different microstructure characterization techniques including XRD, FTIR, MIP, dilatometry, and SEM. Crack formation due to moisture migration, pore shrinkage, and re-crystallization of nepheline adversely affected compressive strength. Matrix densification due to shrinkage of pore and stronger inter-particle bonding due to viscous sintering, favored compressive strength gain. This work discusses at length these competing mechanisms influencing the residual compressive strength. |
| first_indexed | 2024-10-01T02:44:56Z |
| format | Journal Article |
| id | ntu-10356/161158 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:44:56Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1611582022-08-17T02:29:19Z Tailoring sodium-based fly ash geopolymers with variegated thermal performance Lahoti, Mukund Wijaya, Stephen Fransceda Tan, Kang Hai Yang, En-Hua School of Civil and Environmental Engineering Engineering::Civil engineering Geopolymer Fly Ash Sodium-based fly ash geopolymers show great fire resistance potential and commercial advantage for structural applications. Hence, in current research, tailoring of sodium-based geopolymer mix design without changing the fly ash source has been studied. It was found that a wide variety of residual compressive strength ranging from significant reduction (~80%) to maintaining significant enhancement (~150%) after being exposed to 900 °C was observed. The contributory mechanisms were discovered by investigating their chemical stability, pore structures, volume stability, and strength endurance prior to and after exposure to high-temperature using different microstructure characterization techniques including XRD, FTIR, MIP, dilatometry, and SEM. Crack formation due to moisture migration, pore shrinkage, and re-crystallization of nepheline adversely affected compressive strength. Matrix densification due to shrinkage of pore and stronger inter-particle bonding due to viscous sintering, favored compressive strength gain. This work discusses at length these competing mechanisms influencing the residual compressive strength. Ministry of National Development (MND) The authors would like to thank the funding support for this project from Land and Livability National Innovation Challenge, Ministry of National Development, Singapore (L2NICCFP1-2013-4) and Research Initiation Grant from Birla Institute of Technology and Science, Pilani, Pilani campus, India. 2022-08-17T02:29:19Z 2022-08-17T02:29:19Z 2020 Journal Article Lahoti, M., Wijaya, S. F., Tan, K. H. & Yang, E. (2020). Tailoring sodium-based fly ash geopolymers with variegated thermal performance. Cement and Concrete Composites, 107, 103507-. https://dx.doi.org/10.1016/j.cemconcomp.2019.103507 0958-9465 https://hdl.handle.net/10356/161158 10.1016/j.cemconcomp.2019.103507 2-s2.0-85077391014 107 103507 en L2NICCFP1-2013-4 Cement and Concrete Composites © 2020 Elsevier Ltd. All rights reserved. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Geopolymer Fly Ash Lahoti, Mukund Wijaya, Stephen Fransceda Tan, Kang Hai Yang, En-Hua Tailoring sodium-based fly ash geopolymers with variegated thermal performance |
| title | Tailoring sodium-based fly ash geopolymers with variegated thermal performance |
| title_full | Tailoring sodium-based fly ash geopolymers with variegated thermal performance |
| title_fullStr | Tailoring sodium-based fly ash geopolymers with variegated thermal performance |
| title_full_unstemmed | Tailoring sodium-based fly ash geopolymers with variegated thermal performance |
| title_short | Tailoring sodium-based fly ash geopolymers with variegated thermal performance |
| title_sort | tailoring sodium based fly ash geopolymers with variegated thermal performance |
| topic | Engineering::Civil engineering Geopolymer Fly Ash |
| url | https://hdl.handle.net/10356/161158 |
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