Use of gasification fly ash, sodium carbonate, and ground granulated blast-furnace slag for soft clay stabilization
Gasification fly ash (GFA) generated from the municipal solid waste (MSW) slagging-gasification is strongly alkaline and has the potential to be used to activate ground granulated blast-furnace slag (GGBS) for soil stabilization. However, heavy metals like Pb and Zn in GFA would retard the hydration...
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Online Access: | https://hdl.handle.net/10356/175410 |
| _version_ | 1811695233003421696 |
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| author | Qin, Junde Yi, Yaolin |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Qin, Junde Yi, Yaolin |
| author_sort | Qin, Junde |
| collection | NTU |
| description | Gasification fly ash (GFA) generated from the municipal solid waste (MSW) slagging-gasification is strongly alkaline and has the potential to be used to activate ground granulated blast-furnace slag (GGBS) for soil stabilization. However, heavy metals like Pb and Zn in GFA would retard the hydration of GGBS and reduce the final strength of stabilized clay. Thus, sodium carbonate (Na2CO3) is added to mitigate the negative effect caused by heavy metals. In this study, GFA-Na2CO3-GGBS stabilized soft clay with a high initial water content was studied and compared with conventional ordinary Portland cement (OPC) stabilized soft clay. The unconfined compressive strength of stabilized soft clays at 14, 28, and 56 days was measured to assess their mechanical performance. To analyze the stabilization process, the concentrations of Ca, Si, Al, and Zn in pore water separated from stabilized clay slurries at early ages were measured. The results revealed that GFA was effective to activate GGBS for soft clay stabilization, and the addition of a proper amount of Na2CO3 accelerated the hardening of stabilized clays, led to higher strength at early ages, and reduced the leached heavy metals. |
| first_indexed | 2024-10-01T07:20:12Z |
| format | Journal Article |
| id | ntu-10356/175410 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:20:12Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1754102024-04-26T15:35:14Z Use of gasification fly ash, sodium carbonate, and ground granulated blast-furnace slag for soft clay stabilization Qin, Junde Yi, Yaolin School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Engineering Municipal solid waste Gasification fly ash Gasification fly ash (GFA) generated from the municipal solid waste (MSW) slagging-gasification is strongly alkaline and has the potential to be used to activate ground granulated blast-furnace slag (GGBS) for soil stabilization. However, heavy metals like Pb and Zn in GFA would retard the hydration of GGBS and reduce the final strength of stabilized clay. Thus, sodium carbonate (Na2CO3) is added to mitigate the negative effect caused by heavy metals. In this study, GFA-Na2CO3-GGBS stabilized soft clay with a high initial water content was studied and compared with conventional ordinary Portland cement (OPC) stabilized soft clay. The unconfined compressive strength of stabilized soft clays at 14, 28, and 56 days was measured to assess their mechanical performance. To analyze the stabilization process, the concentrations of Ca, Si, Al, and Zn in pore water separated from stabilized clay slurries at early ages were measured. The results revealed that GFA was effective to activate GGBS for soft clay stabilization, and the addition of a proper amount of Na2CO3 accelerated the hardening of stabilized clays, led to higher strength at early ages, and reduced the leached heavy metals. Ministry of Education (MOE) Submitted/Accepted version This research is supported by the Ministry of Education, Singapore, under Academic Research Fund Tier 1 grant (RG139/20), and China Singapore International Joint Research Institute (N2052401–A204).. 2024-04-23T05:18:37Z 2024-04-23T05:18:37Z 2024 Journal Article Qin, J. & Yi, Y. (2024). Use of gasification fly ash, sodium carbonate, and ground granulated blast-furnace slag for soft clay stabilization. Construction and Building Materials, 426, 136072-. https://dx.doi.org/10.1016/j.conbuildmat.2024.136072 0950-0618 https://hdl.handle.net/10356/175410 10.1016/j.conbuildmat.2024.136072 2-s2.0-85189750990 426 136072 en RG139/20 Construction and Building Materials © 2024 Elsevier Ltd. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1016/j.conbuildmat.2024.136072. application/pdf |
| spellingShingle | Engineering Municipal solid waste Gasification fly ash Qin, Junde Yi, Yaolin Use of gasification fly ash, sodium carbonate, and ground granulated blast-furnace slag for soft clay stabilization |
| title | Use of gasification fly ash, sodium carbonate, and ground granulated blast-furnace slag for soft clay stabilization |
| title_full | Use of gasification fly ash, sodium carbonate, and ground granulated blast-furnace slag for soft clay stabilization |
| title_fullStr | Use of gasification fly ash, sodium carbonate, and ground granulated blast-furnace slag for soft clay stabilization |
| title_full_unstemmed | Use of gasification fly ash, sodium carbonate, and ground granulated blast-furnace slag for soft clay stabilization |
| title_short | Use of gasification fly ash, sodium carbonate, and ground granulated blast-furnace slag for soft clay stabilization |
| title_sort | use of gasification fly ash sodium carbonate and ground granulated blast furnace slag for soft clay stabilization |
| topic | Engineering Municipal solid waste Gasification fly ash |
| url | https://hdl.handle.net/10356/175410 |
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