Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica
This study investigated the effects of nano-silica on flowability, strength development, sorptivity and acid resistance properties of fly ash geopolymer mortars cured at 20 C. The changes in mass, compressive strength and microstructure of the specimens after immersion in acid solutions for differe...
| Main Authors: | , , |
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| Format: | Journal Article |
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Elsevier BV
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/41839 |
| _version_ | 1848756254836523008 |
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| author | Deb, Partha Sarker, Prabir Barbhuiya, Salim |
| author_facet | Deb, Partha Sarker, Prabir Barbhuiya, Salim |
| author_sort | Deb, Partha |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | This study investigated the effects of nano-silica on flowability, strength development, sorptivity and acid resistance properties of fly ash geopolymer mortars cured at 20 C. The changes in mass, compressive strength and microstructure of the specimens after immersion in acid solutions for different durations were determined. The microstructures were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis. It was found that addition of nanosilica in geopolymer mortars based on fly ash alone or fly ash blended with 15% GGBFS or 10% OPC improved the compactness of microstructure by reducing porosity. Thus, the nano-silica reduced sorptivity and increased compressive strength of the mixes. The average mass loss after 90 days of immersion in acid solutions reduced from 6.0% to 1.9% by addition of 2% nano-silica. Similarly, significant reduction in strength loss after immersion in acid solution was observed in the specimens by using nano-silica. |
| first_indexed | 2025-11-14T09:09:17Z |
| format | Journal Article |
| id | curtin-20.500.11937-41839 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:09:17Z |
| publishDate | 2016 |
| publisher | Elsevier BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-418392018-07-02T00:38:11Z Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica Deb, Partha Sarker, Prabir Barbhuiya, Salim This study investigated the effects of nano-silica on flowability, strength development, sorptivity and acid resistance properties of fly ash geopolymer mortars cured at 20 C. The changes in mass, compressive strength and microstructure of the specimens after immersion in acid solutions for different durations were determined. The microstructures were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis. It was found that addition of nanosilica in geopolymer mortars based on fly ash alone or fly ash blended with 15% GGBFS or 10% OPC improved the compactness of microstructure by reducing porosity. Thus, the nano-silica reduced sorptivity and increased compressive strength of the mixes. The average mass loss after 90 days of immersion in acid solutions reduced from 6.0% to 1.9% by addition of 2% nano-silica. Similarly, significant reduction in strength loss after immersion in acid solution was observed in the specimens by using nano-silica. 2016 Journal Article http://hdl.handle.net/20.500.11937/41839 10.1016/j.cemconcomp.2016.06.017 Elsevier BV fulltext |
| spellingShingle | Deb, Partha Sarker, Prabir Barbhuiya, Salim Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica |
| title | Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica |
| title_full | Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica |
| title_fullStr | Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica |
| title_full_unstemmed | Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica |
| title_short | Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica |
| title_sort | sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica |
| url | http://hdl.handle.net/20.500.11937/41839 |