Experimental investigation and optimization of one-part alkali-activated self-compacting concrete mixes
Emphasizing the growing importance of sustainability, alkali-activated materials (AAMs) have emerged as a revolutionary alternative for cement in the construction sector. This study delves into the fresh, mechanical, and microstructural properties of One-Part Alkali-activated Self-compacting Concret...
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| Language: | English |
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Elsevier
2024-12-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509524012142 |
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| author | Kaku Mahendra Mattur C. Narasimhan Gundupalli Bhanu Prakash Amit Kumar Das |
| author_facet | Kaku Mahendra Mattur C. Narasimhan Gundupalli Bhanu Prakash Amit Kumar Das |
| author_sort | Kaku Mahendra |
| collection | DOAJ |
| description | Emphasizing the growing importance of sustainability, alkali-activated materials (AAMs) have emerged as a revolutionary alternative for cement in the construction sector. This study delves into the fresh, mechanical, and microstructural properties of One-Part Alkali-activated Self-compacting Concrete (OPASC) mixes. While mixtures of Ground Granulated Blast Furnace Slag (GGBFS) and Fly Ash (FA) were utilized as the precursors, powdered sodium metasilicate was employed to function as the activator. To streamline experimental design and reduce the economic demands of extensive testing, the Taguchi-Grey Relational Analysis (GRA) was utilized to identify optimal multi-response parameter levels. This method considered binder content (B) within a range of 700–800 kg/m³ , water-to-binder (W/B) ratios between 0.38 and 0.42, and Na2O percentages from 5 % to 7 % as key input variables. Results indicated that the designed mixes recorded workability values satisfying the EFNARC guidelines, compressive strengths greater than 60 MPa, split-tensile strengths in the range of 3.5–4.6 MPa, and flexural strengths varying between 5.5 and 7.2 MPa. The mix parameters for the optimal mix, with the highest mean grey relational grade, were identified from the Taguchi-GRPA approach as B = 750 kg/m3, W/B = 0.4, and N = 6 %. Microstructural analysis revealed the formation of C/N-A-S-H type gels, which are instrumental in developing a compact matrix enhancing the mechanical properties. A good agreement between actual experimental results obtained for a different set of verification mixes with those predicted by regression-equations confirmed the potency of the Taguchi-GRA approach in optimizing the OPASC mix parameters. |
| format | Article |
| id | doaj-art-ccc0d498de6340a7be1f853d340cef5c |
| institution | OA Journals |
| issn | 2214-5095 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-ccc0d498de6340a7be1f853d340cef5c2025-08-20T02:20:42ZengElsevierCase Studies in Construction Materials2214-50952024-12-0121e0406210.1016/j.cscm.2024.e04062Experimental investigation and optimization of one-part alkali-activated self-compacting concrete mixesKaku Mahendra0Mattur C. Narasimhan1Gundupalli Bhanu Prakash2Amit Kumar Das3Corresponding author.; Department of Civil Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, IndiaDepartment of Civil Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, IndiaDepartment of Civil Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, IndiaDepartment of Civil Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, IndiaEmphasizing the growing importance of sustainability, alkali-activated materials (AAMs) have emerged as a revolutionary alternative for cement in the construction sector. This study delves into the fresh, mechanical, and microstructural properties of One-Part Alkali-activated Self-compacting Concrete (OPASC) mixes. While mixtures of Ground Granulated Blast Furnace Slag (GGBFS) and Fly Ash (FA) were utilized as the precursors, powdered sodium metasilicate was employed to function as the activator. To streamline experimental design and reduce the economic demands of extensive testing, the Taguchi-Grey Relational Analysis (GRA) was utilized to identify optimal multi-response parameter levels. This method considered binder content (B) within a range of 700–800 kg/m³ , water-to-binder (W/B) ratios between 0.38 and 0.42, and Na2O percentages from 5 % to 7 % as key input variables. Results indicated that the designed mixes recorded workability values satisfying the EFNARC guidelines, compressive strengths greater than 60 MPa, split-tensile strengths in the range of 3.5–4.6 MPa, and flexural strengths varying between 5.5 and 7.2 MPa. The mix parameters for the optimal mix, with the highest mean grey relational grade, were identified from the Taguchi-GRPA approach as B = 750 kg/m3, W/B = 0.4, and N = 6 %. Microstructural analysis revealed the formation of C/N-A-S-H type gels, which are instrumental in developing a compact matrix enhancing the mechanical properties. A good agreement between actual experimental results obtained for a different set of verification mixes with those predicted by regression-equations confirmed the potency of the Taguchi-GRA approach in optimizing the OPASC mix parameters.http://www.sciencedirect.com/science/article/pii/S2214509524012142One-part alkaliTaguchi-GRASelf-compacting concreteSlagFly ashOptimization |
| spellingShingle | Kaku Mahendra Mattur C. Narasimhan Gundupalli Bhanu Prakash Amit Kumar Das Experimental investigation and optimization of one-part alkali-activated self-compacting concrete mixes Case Studies in Construction Materials One-part alkali Taguchi-GRA Self-compacting concrete Slag Fly ash Optimization |
| title | Experimental investigation and optimization of one-part alkali-activated self-compacting concrete mixes |
| title_full | Experimental investigation and optimization of one-part alkali-activated self-compacting concrete mixes |
| title_fullStr | Experimental investigation and optimization of one-part alkali-activated self-compacting concrete mixes |
| title_full_unstemmed | Experimental investigation and optimization of one-part alkali-activated self-compacting concrete mixes |
| title_short | Experimental investigation and optimization of one-part alkali-activated self-compacting concrete mixes |
| title_sort | experimental investigation and optimization of one part alkali activated self compacting concrete mixes |
| topic | One-part alkali Taguchi-GRA Self-compacting concrete Slag Fly ash Optimization |
| url | http://www.sciencedirect.com/science/article/pii/S2214509524012142 |
| work_keys_str_mv | AT kakumahendra experimentalinvestigationandoptimizationofonepartalkaliactivatedselfcompactingconcretemixes AT matturcnarasimhan experimentalinvestigationandoptimizationofonepartalkaliactivatedselfcompactingconcretemixes AT gundupallibhanuprakash experimentalinvestigationandoptimizationofonepartalkaliactivatedselfcompactingconcretemixes AT amitkumardas experimentalinvestigationandoptimizationofonepartalkaliactivatedselfcompactingconcretemixes |