Suppression of Sulfate-Induced Expansion with Lime–Silica Fume Blends
Sulfate-induced expansion resulting from the formation of ettringite in sulfate-bearing soil stabilised with calcium-based stabilisers is a problematic issue with technical and economic implications. Thus, this research examines the viability of the co-addition of lime (L) and silica fume (S) at var...
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MDPI AG
2022-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/8/2821 |
| _version_ | 1797434410727899136 |
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| author | Mansour Ebailila John Kinuthia Jonathan Oti |
| author_facet | Mansour Ebailila John Kinuthia Jonathan Oti |
| author_sort | Mansour Ebailila |
| collection | DOAJ |
| description | Sulfate-induced expansion resulting from the formation of ettringite in sulfate-bearing soil stabilised with calcium-based stabilisers is a problematic issue with technical and economic implications. Thus, this research examines the viability of the co-addition of lime (L) and silica fume (S) at varying binder dosages (4, 6, and 10 wt%), with a view of establishing the optimum blend of L–S for suppressing the ettringite-induced expansion of artificially high sulfate-dosed soil (kaolinite-K and gypsum-G). To do so, a series of laboratory specimens, designed using different gypsum and lime concentrations, were investigated using unconfined compression strength (UCS), linear expansion, and derivative thermo-gravimetric analysis (DTG) as the main criteria for the examination. The research outcomes indicated that the increasing substitution of L with S induces a gradual reduction on the UCS and linear expansion at binder levels of 4 and 6 wt%, while its usage in a high binder level (10 wt%), can yield an expansion reduction, with no compromise on the UCS performance. Therefore, silica fume has the potential for restricting ettringite formation and suppressing the expansion, of which 3L7S is the optimum blending ratio for suppressing the expansion. |
| first_indexed | 2024-03-09T10:31:50Z |
| format | Article |
| id | doaj.art-308c70c96eff439ba7d9de564837199c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T10:31:50Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-308c70c96eff439ba7d9de564837199c2023-12-01T21:11:14ZengMDPI AGMaterials1996-19442022-04-01158282110.3390/ma15082821Suppression of Sulfate-Induced Expansion with Lime–Silica Fume BlendsMansour Ebailila0John Kinuthia1Jonathan Oti2Department of Civil Engineering, Faculty of Engineering, Bani Waleed University, Bani Waleed, LibyaSchool of Engineering, Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 1DL, UKSchool of Engineering, Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 1DL, UKSulfate-induced expansion resulting from the formation of ettringite in sulfate-bearing soil stabilised with calcium-based stabilisers is a problematic issue with technical and economic implications. Thus, this research examines the viability of the co-addition of lime (L) and silica fume (S) at varying binder dosages (4, 6, and 10 wt%), with a view of establishing the optimum blend of L–S for suppressing the ettringite-induced expansion of artificially high sulfate-dosed soil (kaolinite-K and gypsum-G). To do so, a series of laboratory specimens, designed using different gypsum and lime concentrations, were investigated using unconfined compression strength (UCS), linear expansion, and derivative thermo-gravimetric analysis (DTG) as the main criteria for the examination. The research outcomes indicated that the increasing substitution of L with S induces a gradual reduction on the UCS and linear expansion at binder levels of 4 and 6 wt%, while its usage in a high binder level (10 wt%), can yield an expansion reduction, with no compromise on the UCS performance. Therefore, silica fume has the potential for restricting ettringite formation and suppressing the expansion, of which 3L7S is the optimum blending ratio for suppressing the expansion.https://www.mdpi.com/1996-1944/15/8/2821sulfate bearing-soilettringitecalcium-based stabiliserlimesilica fumemechanical strength |
| spellingShingle | Mansour Ebailila John Kinuthia Jonathan Oti Suppression of Sulfate-Induced Expansion with Lime–Silica Fume Blends Materials sulfate bearing-soil ettringite calcium-based stabiliser lime silica fume mechanical strength |
| title | Suppression of Sulfate-Induced Expansion with Lime–Silica Fume Blends |
| title_full | Suppression of Sulfate-Induced Expansion with Lime–Silica Fume Blends |
| title_fullStr | Suppression of Sulfate-Induced Expansion with Lime–Silica Fume Blends |
| title_full_unstemmed | Suppression of Sulfate-Induced Expansion with Lime–Silica Fume Blends |
| title_short | Suppression of Sulfate-Induced Expansion with Lime–Silica Fume Blends |
| title_sort | suppression of sulfate induced expansion with lime silica fume blends |
| topic | sulfate bearing-soil ettringite calcium-based stabiliser lime silica fume mechanical strength |
| url | https://www.mdpi.com/1996-1944/15/8/2821 |
| work_keys_str_mv | AT mansourebailila suppressionofsulfateinducedexpansionwithlimesilicafumeblends AT johnkinuthia suppressionofsulfateinducedexpansionwithlimesilicafumeblends AT jonathanoti suppressionofsulfateinducedexpansionwithlimesilicafumeblends |