Influence of the type of activator combinations on the deflection hardening behavior of geopolymer composites
This paper presents the effects of two different sodium-based (Na-based) and potassium based (K-based) activator combinations on the properties of a recently developed fly ash-based ductile fiber reinforced geopolymer composite (DFRGC) exhibiting deflection hardening and multiple cracking behavior i...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Conference Paper |
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RILEM Publications S.A.R.L.
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/18824 |
| _version_ | 1848749857043382272 |
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| author | Nematollahi, B. Sanjayan, J. Shaikh, Faiz |
| author2 | E. Schlangen M.G. Sierra Beltran M. Lukovic G. Ye |
| author_facet | E. Schlangen M.G. Sierra Beltran M. Lukovic G. Ye Nematollahi, B. Sanjayan, J. Shaikh, Faiz |
| author_sort | Nematollahi, B. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | This paper presents the effects of two different sodium-based (Na-based) and potassium based (K-based) activator combinations on the properties of a recently developed fly ash-based ductile fiber reinforced geopolymer composite (DFRGC) exhibiting deflection hardening and multiple cracking behavior in flexure. Randomly oriented short poly vinyl alcohol (PVA) fibers (2% v/v) were used to reinforce the brittle low calcium (Class F) fly ash-based geopolymer matrix. The 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, the K-based 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 DFRGCs including workability of the fresh matrix, density, compressive and flexural strengths, deflection capacity and composite toughness were evaluated. Experimental results revealed that although the potassium-based DFRGC (DFRGC-K) exhibited superior matrix workability; however, the sodium-based DFRGC (DFRGC-Na) exhibited superior deflection capacity, compressive and flexural strengths with significantly enhanced composite ductility and toughness. |
| first_indexed | 2025-11-14T07:27:36Z |
| format | Conference Paper |
| id | curtin-20.500.11937-18824 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:27:36Z |
| publishDate | 2014 |
| publisher | RILEM Publications S.A.R.L. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-188242023-02-13T08:01:38Z Influence of the type of activator combinations on the deflection hardening behavior of geopolymer composites Nematollahi, B. Sanjayan, J. Shaikh, Faiz E. Schlangen M.G. Sierra Beltran M. Lukovic G. Ye This paper presents the effects of two different sodium-based (Na-based) and potassium based (K-based) activator combinations on the properties of a recently developed fly ash-based ductile fiber reinforced geopolymer composite (DFRGC) exhibiting deflection hardening and multiple cracking behavior in flexure. Randomly oriented short poly vinyl alcohol (PVA) fibers (2% v/v) were used to reinforce the brittle low calcium (Class F) fly ash-based geopolymer matrix. The 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, the K-based 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 DFRGCs including workability of the fresh matrix, density, compressive and flexural strengths, deflection capacity and composite toughness were evaluated. Experimental results revealed that although the potassium-based DFRGC (DFRGC-K) exhibited superior matrix workability; however, the sodium-based DFRGC (DFRGC-Na) exhibited superior deflection capacity, compressive and flexural strengths with significantly enhanced composite ductility and toughness. 2014 Conference Paper http://hdl.handle.net/20.500.11937/18824 RILEM Publications S.A.R.L. restricted |
| spellingShingle | Nematollahi, B. Sanjayan, J. Shaikh, Faiz Influence of the type of activator combinations on the deflection hardening behavior of geopolymer composites |
| title | Influence of the type of activator combinations on the deflection hardening behavior of geopolymer composites |
| title_full | Influence of the type of activator combinations on the deflection hardening behavior of geopolymer composites |
| title_fullStr | Influence of the type of activator combinations on the deflection hardening behavior of geopolymer composites |
| title_full_unstemmed | Influence of the type of activator combinations on the deflection hardening behavior of geopolymer composites |
| title_short | Influence of the type of activator combinations on the deflection hardening behavior of geopolymer composites |
| title_sort | influence of the type of activator combinations on the deflection hardening behavior of geopolymer composites |
| url | http://hdl.handle.net/20.500.11937/18824 |