Strain Hardening Behavior of Engineered Geopolymer Composites: Effects of the Activator Combination
Fly ash-based engineered geopolymer composites (EGCs) exhibiting strain hardening behavior under uni-axial tension were developed employing two different sodium-based (Na-based) and potassium-based (K-based) activator combinations. The relatively brittle low calcium (Class F) fly ash-based geopolyme...
| Main Authors: | , , |
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| Format: | Journal Article |
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Australian Ceramic Society
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/37933 |
| _version_ | 1848755182929707008 |
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| author | Nematollahi, B. Sanjayan, J. Shaikh, Faiz |
| author_facet | Nematollahi, B. Sanjayan, J. Shaikh, Faiz |
| author_sort | Nematollahi, B. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Fly ash-based engineered geopolymer composites (EGCs) exhibiting strain hardening behavior under uni-axial tension were developed employing two different sodium-based (Na-based) and potassium-based (K-based) activator combinations. The relatively brittle low calcium (Class F) fly ash-based geopolymer matrix was reinforced with randomly oriented short poly vinyl alcohol (PVA) fibers (2% v/v). Na-based activator combination was composed of 8.0 M NaOH solution (28.6% w/w) and Na2SiO3 solution (71.4% w/w) with a SiO2/Na2O ratio of 2.0; whereas, Kbased activator combination was composed of 8.0 M KOH solution (28.6% w/w) and K2SiO3 solution (71.4% w/w) with a SiO2/K2O ratio of 2.23. The matrix and composite properties of the developed fly ash-based EGCs including workability of the fresh matrix, density, compressive strength and uni-axial tensile behavior were evaluated. The experimental results revealed that the sodium-based EGC (EGC-Na) exhibited superior tensile strain capacity, compressive and uni-axial tensile strengths with significantly enhanced ductility. |
| first_indexed | 2025-11-14T08:52:15Z |
| format | Journal Article |
| id | curtin-20.500.11937-37933 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:52:15Z |
| publishDate | 2015 |
| publisher | Australian Ceramic Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-379332019-04-30T03:10:59Z Strain Hardening Behavior of Engineered Geopolymer Composites: Effects of the Activator Combination Nematollahi, B. Sanjayan, J. Shaikh, Faiz Fly ash-based engineered geopolymer composites (EGCs) exhibiting strain hardening behavior under uni-axial tension were developed employing two different sodium-based (Na-based) and potassium-based (K-based) activator combinations. The relatively brittle low calcium (Class F) fly ash-based geopolymer matrix was reinforced with randomly oriented short poly vinyl alcohol (PVA) fibers (2% v/v). Na-based activator combination was composed of 8.0 M NaOH solution (28.6% w/w) and Na2SiO3 solution (71.4% w/w) with a SiO2/Na2O ratio of 2.0; whereas, Kbased activator combination was composed of 8.0 M KOH solution (28.6% w/w) and K2SiO3 solution (71.4% w/w) with a SiO2/K2O ratio of 2.23. The matrix and composite properties of the developed fly ash-based EGCs including workability of the fresh matrix, density, compressive strength and uni-axial tensile behavior were evaluated. The experimental results revealed that the sodium-based EGC (EGC-Na) exhibited superior tensile strain capacity, compressive and uni-axial tensile strengths with significantly enhanced ductility. 2015 Journal Article http://hdl.handle.net/20.500.11937/37933 Australian Ceramic Society fulltext |
| spellingShingle | Nematollahi, B. Sanjayan, J. Shaikh, Faiz Strain Hardening Behavior of Engineered Geopolymer Composites: Effects of the Activator Combination |
| title | Strain Hardening Behavior of Engineered Geopolymer Composites: Effects of the Activator Combination |
| title_full | Strain Hardening Behavior of Engineered Geopolymer Composites: Effects of the Activator Combination |
| title_fullStr | Strain Hardening Behavior of Engineered Geopolymer Composites: Effects of the Activator Combination |
| title_full_unstemmed | Strain Hardening Behavior of Engineered Geopolymer Composites: Effects of the Activator Combination |
| title_short | Strain Hardening Behavior of Engineered Geopolymer Composites: Effects of the Activator Combination |
| title_sort | strain hardening behavior of engineered geopolymer composites: effects of the activator combination |
| url | http://hdl.handle.net/20.500.11937/37933 |