Effect of fly ash on the potential alkali silica reaction of ferronickel slag aggregate
Ferronickel slag (FNS) is generated as a by-product during the production of ferronickel. The rapid cooling process of the slag may lead to the formation of amorphous silica. Therefore, partial replacement of sand with nickel slag aggregate has potential to show expansion due to alkali silica reacti...
| Main Authors: | , |
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| Format: | Conference Paper |
| Published: |
2017
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/83262 |
| _version_ | 1848764571049787392 |
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| author | Saha, Ashish Kumer Sarker, Prabir |
| author_facet | Saha, Ashish Kumer Sarker, Prabir |
| author_sort | Saha, Ashish Kumer |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Ferronickel slag (FNS) is generated as a by-product during the production of ferronickel. The rapid cooling process of the slag may lead to the formation of amorphous silica. Therefore, partial replacement of sand with nickel slag aggregate has potential to show expansion due to alkali silica reaction (ASR). The present study evaluates the effect of fly ash as a supplementary cementing material (SCM) to mitigate this deleterious expansion. Fly ash was used as 10%, 20% and 30% of the binder in order to investigate its effect on the reduction of ASR. The results of accelerated mortar bar test (AMBT) show that 10% replacement of cement by fly ash was unable to reduce expansion below the required level. Furthermore, use of 20% fly ash reduced the expansion by 45% compared to 10% fly ash samples, but still the expansion level of the samples was within the category of slowly reactive aggregate according to AS 1141.60.1-14. However, use of 30% fly ash reduced ASR expansion below the 10-day and 21-day limits of the standard. It was found that expansion did not increase for the extended period of test in the samples containing 30% fly ash. The microstructural observation was carried out to confirm the effectiveness of fly ash to mitigate this expansion. |
| first_indexed | 2025-11-14T11:21:28Z |
| format | Conference Paper |
| id | curtin-20.500.11937-83262 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:21:28Z |
| publishDate | 2017 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-832622021-04-27T04:38:23Z Effect of fly ash on the potential alkali silica reaction of ferronickel slag aggregate Saha, Ashish Kumer Sarker, Prabir Alkali silica reaction, nickel slag, fly ash, amorphous silica. Ferronickel slag (FNS) is generated as a by-product during the production of ferronickel. The rapid cooling process of the slag may lead to the formation of amorphous silica. Therefore, partial replacement of sand with nickel slag aggregate has potential to show expansion due to alkali silica reaction (ASR). The present study evaluates the effect of fly ash as a supplementary cementing material (SCM) to mitigate this deleterious expansion. Fly ash was used as 10%, 20% and 30% of the binder in order to investigate its effect on the reduction of ASR. The results of accelerated mortar bar test (AMBT) show that 10% replacement of cement by fly ash was unable to reduce expansion below the required level. Furthermore, use of 20% fly ash reduced the expansion by 45% compared to 10% fly ash samples, but still the expansion level of the samples was within the category of slowly reactive aggregate according to AS 1141.60.1-14. However, use of 30% fly ash reduced ASR expansion below the 10-day and 21-day limits of the standard. It was found that expansion did not increase for the extended period of test in the samples containing 30% fly ash. The microstructural observation was carried out to confirm the effectiveness of fly ash to mitigate this expansion. 2017 Conference Paper http://hdl.handle.net/20.500.11937/83262 fulltext |
| spellingShingle | Alkali silica reaction, nickel slag, fly ash, amorphous silica. Saha, Ashish Kumer Sarker, Prabir Effect of fly ash on the potential alkali silica reaction of ferronickel slag aggregate |
| title | Effect of fly ash on the potential alkali silica reaction of ferronickel slag aggregate |
| title_full | Effect of fly ash on the potential alkali silica reaction of ferronickel slag aggregate |
| title_fullStr | Effect of fly ash on the potential alkali silica reaction of ferronickel slag aggregate |
| title_full_unstemmed | Effect of fly ash on the potential alkali silica reaction of ferronickel slag aggregate |
| title_short | Effect of fly ash on the potential alkali silica reaction of ferronickel slag aggregate |
| title_sort | effect of fly ash on the potential alkali silica reaction of ferronickel slag aggregate |
| topic | Alkali silica reaction, nickel slag, fly ash, amorphous silica. |
| url | http://hdl.handle.net/20.500.11937/83262 |