Effect of Silicate Fume -Based Activating Solution on Mechanical Properties of Fly Ash/Silica Fume Geopolymer Concrete
This study introduces a novel approach by entirely substituting commercial Soduim Silicate (Na₂SiO₃) with silica fume (SF), an industrial by-product, to create economical and eco-friendly GC. Fly ash (FA) was partially substituted with SF at proportions of 20%, 25%, 30%, and 35% of the total binder...
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Assiut University, Faculty of Engineering
2025-11-01
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| Series: | JES: Journal of Engineering Sciences |
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| Online Access: | https://jesaun.journals.ekb.eg/article_442310_eb4499143c07af975ba47ab98ba18e8b.pdf |
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| _version_ | 1849330904429756416 |
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| author | Yasmin Abdel Aziz Abeer El Malky |
| author_facet | Yasmin Abdel Aziz Abeer El Malky |
| author_sort | Yasmin Abdel Aziz |
| collection | DOAJ |
| description | This study introduces a novel approach by entirely substituting commercial Soduim Silicate (Na₂SiO₃) with silica fume (SF), an industrial by-product, to create economical and eco-friendly GC. Fly ash (FA) was partially substituted with SF at proportions of 20%, 25%, 30%, and 35% of the total binder weight to assess its impact on mechanical performance. The alkaline activator solution was employed at 30%, 35%, and 40% of binder weight, with different SF/NaOH ratios (0.75, 1.5, and 2.0) to enhance the activation process. Treated rubber fibers (0.3% by binder weight) were included to improve ductility. The workability and mechanical properties were assessed using slump, compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity tests. Test results indicated that higher SF replacements diminished workability and strength, with a 25% substitution yielding optimal results. The SF-based activator demonstrated comparable strength to traditional methods, attaining optimal performance at an SF/NaOH ratio of 1.5. The inclusion of rubber fibers enhanced the elastic modulus by 10.8%. Microstructural analysis using SEM and EDX confirmed the formation of a denser matrix with fewer cracks and improved bonding. This research presents a viable alternative to commercial activators and proposes a sustainable GC mix design utilizing industrial by-products, contributing to more eco-friendly construction materials. |
| format | Article |
| id | doaj-art-d5a8c7f27eba4d25bcffb2e5d78c4bf2 |
| institution | Kabale University |
| issn | 1687-0530 2356-8550 |
| language | Arabic |
| publishDate | 2025-11-01 |
| publisher | Assiut University, Faculty of Engineering |
| record_format | Article |
| series | JES: Journal of Engineering Sciences |
| spelling | doaj-art-d5a8c7f27eba4d25bcffb2e5d78c4bf22025-08-20T03:46:46ZaraAssiut University, Faculty of EngineeringJES: Journal of Engineering Sciences1687-05302356-85502025-11-0153624827310.21608/jesaun.2025.383265.1506442310Effect of Silicate Fume -Based Activating Solution on Mechanical Properties of Fly Ash/Silica Fume Geopolymer ConcreteYasmin Abdel Aziz0Abeer El Malky1Civil Engineering Department, Faculty of Engineering, Modern University for Technology & Information, Cairo, EgyptCivil Engineering Department, Faculty of Engineering, Modern University for Technology & Information, Cairo, EgyptThis study introduces a novel approach by entirely substituting commercial Soduim Silicate (Na₂SiO₃) with silica fume (SF), an industrial by-product, to create economical and eco-friendly GC. Fly ash (FA) was partially substituted with SF at proportions of 20%, 25%, 30%, and 35% of the total binder weight to assess its impact on mechanical performance. The alkaline activator solution was employed at 30%, 35%, and 40% of binder weight, with different SF/NaOH ratios (0.75, 1.5, and 2.0) to enhance the activation process. Treated rubber fibers (0.3% by binder weight) were included to improve ductility. The workability and mechanical properties were assessed using slump, compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity tests. Test results indicated that higher SF replacements diminished workability and strength, with a 25% substitution yielding optimal results. The SF-based activator demonstrated comparable strength to traditional methods, attaining optimal performance at an SF/NaOH ratio of 1.5. The inclusion of rubber fibers enhanced the elastic modulus by 10.8%. Microstructural analysis using SEM and EDX confirmed the formation of a denser matrix with fewer cracks and improved bonding. This research presents a viable alternative to commercial activators and proposes a sustainable GC mix design utilizing industrial by-products, contributing to more eco-friendly construction materials.https://jesaun.journals.ekb.eg/article_442310_eb4499143c07af975ba47ab98ba18e8b.pdfgeopolymergeopolymerizationaluminosilicatefly ashsilica fume |
| spellingShingle | Yasmin Abdel Aziz Abeer El Malky Effect of Silicate Fume -Based Activating Solution on Mechanical Properties of Fly Ash/Silica Fume Geopolymer Concrete JES: Journal of Engineering Sciences geopolymer geopolymerization aluminosilicate fly ash silica fume |
| title | Effect of Silicate Fume -Based Activating Solution on Mechanical Properties of Fly Ash/Silica Fume Geopolymer Concrete |
| title_full | Effect of Silicate Fume -Based Activating Solution on Mechanical Properties of Fly Ash/Silica Fume Geopolymer Concrete |
| title_fullStr | Effect of Silicate Fume -Based Activating Solution on Mechanical Properties of Fly Ash/Silica Fume Geopolymer Concrete |
| title_full_unstemmed | Effect of Silicate Fume -Based Activating Solution on Mechanical Properties of Fly Ash/Silica Fume Geopolymer Concrete |
| title_short | Effect of Silicate Fume -Based Activating Solution on Mechanical Properties of Fly Ash/Silica Fume Geopolymer Concrete |
| title_sort | effect of silicate fume based activating solution on mechanical properties of fly ash silica fume geopolymer concrete |
| topic | geopolymer geopolymerization aluminosilicate fly ash silica fume |
| url | https://jesaun.journals.ekb.eg/article_442310_eb4499143c07af975ba47ab98ba18e8b.pdf |
| work_keys_str_mv | AT yasminabdelaziz effectofsilicatefumebasedactivatingsolutiononmechanicalpropertiesofflyashsilicafumegeopolymerconcrete AT abeerelmalky effectofsilicatefumebasedactivatingsolutiononmechanicalpropertiesofflyashsilicafumegeopolymerconcrete |