Alkali-treated incineration bottom ash as supplementary cementitious materials
Municipal solid waste incineration bottom ash (IBA) contains metallic aluminum which generates gas when in contact with cement paste. To increase the utilization potential of IBA, alkali treatment for removal of metallic aluminum is proposed. This paper investigated the effects of alkalinity, reacti...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/104261 http://hdl.handle.net/10220/50208 |
| _version_ | 1811688864859815936 |
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| author | Liu, Yiquan Sidhu, Kevindev Singh Chen, Zhitao Yang, En-Hua |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Liu, Yiquan Sidhu, Kevindev Singh Chen, Zhitao Yang, En-Hua |
| author_sort | Liu, Yiquan |
| collection | NTU |
| description | Municipal solid waste incineration bottom ash (IBA) contains metallic aluminum which generates gas when in contact with cement paste. To increase the utilization potential of IBA, alkali treatment for removal of metallic aluminum is proposed. This paper investigated the effects of alkalinity, reaction temperature, and alkali type on the properties of alkali-treated IBA and the resulting IBA blended cement mortars. Results showed that alkali treatment effectively removes the metallic aluminum in IBA and minimizes aeration in IBA blended cement mortars. Furthermore, alkali treatment enhances pozzolanic properties of IBA and the resulting alkali-treated IBA possessed pozzolanic reactivity similar to coal fly ash. The strength activity indices (SAI) of the resulting alkali-treated IBA blended cement mortars were above 75% of the control at the age of 28 days and beyond. In particular, the mix incorporating IBA treated with NaOH (pH = 14) at 25 °C has a strength comparable to that of control at the age of 90 days. The proposed method provides an effective, efficient, and fast means for the removal of metallic aluminum in IBA and the alkali-treated IBA can potentially be used as supplementary cementitious materials for concrete production. |
| first_indexed | 2024-10-01T05:38:59Z |
| format | Journal Article |
| id | ntu-10356/104261 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:38:59Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1042612021-01-05T06:58:26Z Alkali-treated incineration bottom ash as supplementary cementitious materials Liu, Yiquan Sidhu, Kevindev Singh Chen, Zhitao Yang, En-Hua School of Civil and Environmental Engineering Interdisciplinary Graduate School (IGS) Energy Research Institute @ NTU (ERI@N) Supplementary Cementitious Materials Engineering::Civil engineering Incineration Bottom Ash (IBA) Municipal solid waste incineration bottom ash (IBA) contains metallic aluminum which generates gas when in contact with cement paste. To increase the utilization potential of IBA, alkali treatment for removal of metallic aluminum is proposed. This paper investigated the effects of alkalinity, reaction temperature, and alkali type on the properties of alkali-treated IBA and the resulting IBA blended cement mortars. Results showed that alkali treatment effectively removes the metallic aluminum in IBA and minimizes aeration in IBA blended cement mortars. Furthermore, alkali treatment enhances pozzolanic properties of IBA and the resulting alkali-treated IBA possessed pozzolanic reactivity similar to coal fly ash. The strength activity indices (SAI) of the resulting alkali-treated IBA blended cement mortars were above 75% of the control at the age of 28 days and beyond. In particular, the mix incorporating IBA treated with NaOH (pH = 14) at 25 °C has a strength comparable to that of control at the age of 90 days. The proposed method provides an effective, efficient, and fast means for the removal of metallic aluminum in IBA and the alkali-treated IBA can potentially be used as supplementary cementitious materials for concrete production. NRF (Natl Research Foundation, S’pore) Accepted version 2019-10-21T08:38:31Z 2019-12-06T21:29:17Z 2019-10-21T08:38:31Z 2019-12-06T21:29:17Z 2018 Journal Article Liu, Y., Sidhu, K. S., Chen, Z., & Yang, E.-H. (2018). Alkali-treated incineration bottom ash as supplementary cementitious materials. Construction and Building Materials, 179371-378. doi:10.1016/j.conbuildmat.2018.05.231 0950-0618 https://hdl.handle.net/10356/104261 http://hdl.handle.net/10220/50208 10.1016/j.conbuildmat.2018.05.231 en Construction and Building Materials © 2018 Elsevier. All rights reserved. This paper was published in Construction and Building Materials and is made available with permission of Elsevier. 33 p. application/pdf |
| spellingShingle | Supplementary Cementitious Materials Engineering::Civil engineering Incineration Bottom Ash (IBA) Liu, Yiquan Sidhu, Kevindev Singh Chen, Zhitao Yang, En-Hua Alkali-treated incineration bottom ash as supplementary cementitious materials |
| title | Alkali-treated incineration bottom ash as supplementary cementitious materials |
| title_full | Alkali-treated incineration bottom ash as supplementary cementitious materials |
| title_fullStr | Alkali-treated incineration bottom ash as supplementary cementitious materials |
| title_full_unstemmed | Alkali-treated incineration bottom ash as supplementary cementitious materials |
| title_short | Alkali-treated incineration bottom ash as supplementary cementitious materials |
| title_sort | alkali treated incineration bottom ash as supplementary cementitious materials |
| topic | Supplementary Cementitious Materials Engineering::Civil engineering Incineration Bottom Ash (IBA) |
| url | https://hdl.handle.net/10356/104261 http://hdl.handle.net/10220/50208 |
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